Publications
Characterizing surface soil heavy metal contamination and source attribution in the Qinghai Lake Basin
A recent study reveals that surface soil heavy metal contamination in the Qinghai Lake Basin, including the UNESCO-listed Qinghai Hoh Xil region, is currently low and comparable to global crustal averages. However, localized pollution of barium (Ba), chromium (Cr), manganese (Mn), zinc (Zn), and zirconium (Zr) suggests potential point-source impacts, particularly when contrasted with the nearby Hoh Xil Nature Reserve. Researchers analyzed 227 soil samples for twelve heavy metals using enrichment factor (EF), geo-accumulation index (Igeo), Nemero Index (PN), and APCS-MLR modeling, which identified natural factors and transportation as primary pollution sources while ruling out widespread contamination. The study underscores the need for long-term monitoring to mitigate emerging threats, such as co-pollution with microplastics in alpine ecosystems.
Quantifying the changes and driving factors of thermokarst hazards in the Hoh Xil region of the Qinghai–Tibet Plateau
A marked increase in thermokarst hazards, including thermokarst lakes (TLs) and retrogressive thaw slumps (RTS), has been quantified in the fragile alpine ecosystem of Qinghai Hoh Xil. These changes are driven by complex interactions between precipitation, mean annual ground temperature (MAGT), ice content, clay content, soil moisture, thaw index change rate, and precipitation change rate. GeoDetector models revealed that no single factor dominates the spatial pattern of these hazards at the regional scale, highlighting intricate feedbacks between climate warming and permafrost degradation. This study offers critical insights into predicting future impacts on carbon cycling and infrastructure in the Qinghai–Tibet Plateau.
Evaluation Index System for Thermokarst Lake Susceptibility: An Effective Tool for Disaster Warning on the Qinghai–Tibet Plateau, China
Approximately 19.02% of the Qinghai-Tibet Plateau's permafrost region is highly susceptible to thermokarst lake formation, a phenomenon accelerated by climate change and posing significant risks to infrastructure and ecosystems. This finding stems from an innovative evaluation index system developed using Landsat imagery and human-computer interaction, which improved the accuracy of thermokarst lake classification in remote, data-scarce areas. Key factors identified include lake density, soil moisture, slope, vegetation, snow cover, ground temperature, precipitation, and permafrost stability. The study highlights the most vulnerable regions—southwestern Qinghai, northeastern Tibet, and Hoh Xil—as critical zones for disaster warning and mitigation efforts.
Mantle Upwelling Beneath the Hoh‐Xil Basin in the Northern Tibetan Plateau: Evidence From Seismic Anisotropy
New seismic anisotropy measurements reveal significant mantle upwelling beneath the Hoh‐Xil Basin, part of the northern Tibetan Plateau. The study identifies E-W-oriented shear wave splittings aligned with the plateau's absolute plate motion, with a peak delay time of ∼1.8 seconds in the northern Qiangtang and Songpan–Ganzi Terranes. This pattern, combined with post-collisional magmatism migration, suggests lithospheric delamination-driven mantle upwelling. In contrast, the southern portion shows ENE-WSW splitting directions, linked to Indian Plate subduction and poloidal flow, separated by a deep-seated relic terrane. These findings provide evidence for differential mantle flow beneath the Tibetan Plateau, offering insights into how continental subduction shapes orogenic deformation.
Moisture Evolution over the Last 200 years Recorded from Sun Lake in Hoh Xil area of Northern Qinghai-Xizang Plateau
A 200-year record of moisture evolution from Sun Lake in the Qinghai Hoh Xil region reveals distinct climate patterns on the northern Tibetan Plateau. The study, using radiometric dating (137Cs/210Pb) and high-resolution X-ray fluorescence spectroscopy (XRF), shows that the lake experienced wet conditions during the late Little Ice Age and dry conditions during the modern warm period. These findings align with regional trends across the northern Tibetan Plateau. Comparison with the North Atlantic Oscillation (NAO) index indicates that moisture variability in this region is strongly influenced by NAO phase changes, suggesting short-term climate control by large-scale atmospheric patterns.
Spatio-Temporal Evolution and Susceptibility Assessment of Thaw Slumps Associated with Climate Change in the Hoh Xil Region, in the Hinterland of the Qinghai–Tibet Plateau
A threefold increase in the number and twofold expansion in the total area of thaw slumps have been observed in the Hoh Xil region, part of the Qinghai–Tibet Plateau, between 1968 and 2019. This rapid degradation of permafrost, driven by climate change, highlights significant environmental risks, including potential large-scale landslides and debris flows. Researchers assessed thaw slump susceptibility using data from three periods (1968–1970, 2006–2009, and 2018–2019) combined with field surveys. Findings indicate that approximately 26% of the region is very highly susceptible to thaw slumping, while 36% is highly susceptible. The study also projects future thaw slump occurrences, ranging from 41 to 405 annually, emphasizing the urgent need for comprehensive risk assessments across the plateau.
The distribution patterns and enrichment mechanisms of lithium, rubidium, and cesium in the hot springs of the Bukatage Mountains, Hoh Xil
Researchers have uncovered distinct distribution patterns and enrichment mechanisms for lithium, rubidium, and cesium in the hot springs of the Bukatage Mountains, Qinghai Hoh Xil. The study reveals that these elements exhibit high and low concentration characteristics, with high values being 2-3 orders of magnitude greater than low ones, increasing from the mountain slope to the foot. High concentrations are attributed to deep geothermal water, while low concentrations in steam vents stem from shallow groundwater heated by geothermal steam. Stable isotope analysis (δD and δ18O) indicates that hot spring waters originate from magmatic water, atmospheric precipitation, and shallow groundwater, undergoing mixing during ascent. The enrichment process is governed by multiple factors including deep magmatic water-rock reactions, high-temperature shallow groundwater weathering, and surface evaporation. These findings advance the theoretical understanding of rare metal enrichment mechanisms in geothermal systems.
A near-surface fine-velocity structure in the western Hoh Xil Basin revealed by first-arrival travel-time tomography from a deep seismic reflection profile
A high-resolution P-wave velocity structure of the western Hoh Xil Basin (HXB) reveals significant upper crustal tectonic deformation linked to thrust faults, providing insights into the region's geodynamic evolution. The study used first-arrival travel-time tomography on a deep seismic reflection profile to map velocities exceeding 4.0 km/s in Triassic flysch deposits and delineate stratigraphic boundaries with unprecedented lateral resolution. Findings indicate substantial crustal shortening (>50%) during the Late Cretaceous to Early Eocene (81–50 Ma) due to the Tanggula thrust, followed by tectonic uplift controlled by the Hoh Xil and Fenghuoshan thrusts from 45 to 28 Ma. Minimal deformation in Neogene and Quaternary layers suggests weak crustal shortening post-Neogene, challenging assumptions about late-stage uplift mechanisms.
A new approach for evaluating regional permafrost changes: A case study in the Hoh Xil on the interior Qinghai‒Tibet Plateau
A groundbreaking approach to evaluate permafrost changes in the Qinghai Hoh Xil region of the Qinghai-Tibet Plateau (QTP) has been developed, bypassing the need for spatially distributed meteorological data. This method relies instead on regional climate change processes or temperature change rates, centered around a transient heat conduction permafrost model. Applied to the Hoh Xil from 1960 to 2015 using data from the Wudaoliang Meteorological Station, the approach demonstrated high accuracy, with simulated and observed mean annual ground temperature (MAGT) changes differing by less than 0.04 °C per decade at five monitoring sites. Model validation further confirmed its reliability for long-term predictions. Future simulations based on the latest warming scenarios project significant permafrost degradation under severe climate change conditions, with most of Hoh Xil's permafrost becoming warm (MAGT > −1 °C) by 2100. This innovative method offers a new perspective for studying permafrost dynamics in regions with limited meteorological data.
Assessment of dust emissions and their controlling factors on the Hoh Xil, north-central part of the Qinghai-Tibetan plateau
Dust emissions on the Hoh Xil Plateau, a significant dust source on the Qinghai-Tibetan Plateau, primarily occur in spring and winter due to extensive bare and sandy land. Wind speed is the dominant factor influencing these emissions, while precipitation and temperature negatively correlate with them. The recession of lakes in the region has increased sandy lake-shores, potentially raising dust emissions further. Human activities exhibit both positive and negative effects on dust emission changes, depending on economic development and ecological engineering measures. This study quantifies dust yield from 2000 to 2020 and identifies key drivers of aeolian processes, offering critical insights for global dust budget calculations and environmental management.
Correlated crustal and mantle melting documents proto-Tibetan Plateau growth
A new study reveals that the rapid uplift and magmatism in the Hoh-Xil Basin, part of the northern Tibetan Plateau, are driven by lithospheric mantle removal. Using ambient noise tomography to create a three-dimensional S-wave velocity (VS) model, researchers identified widespread partially molten crust beneath the northern Tibetan Plateau, correlated with strong low-VS anomalies in the uppermost mantle and young magmatic rocks. This suggests that the proto-Tibetan Plateau grew outward through processes involving both crustal and mantle melting. The study fills a critical gap by providing seismic data from an otherwise inaccessible region, offering insights into the dynamic forces shaping the plateau's evolution.
Distribution Characteristics and Formation Mechanisms of Rubidium and Cesium in the Water Bodies of the Northern Hoh Xil Region
A study on the northern Hoh Xil region reveals that rubidium (Rb) and cesium (Cs), critical for national resource security, exhibit distinct distribution patterns in lake waters. Rb concentrations range from 2.32 to 2467.7 µg/L, while Cs ranges from 0.65 to 945.53 µg/L, with spatial variations linked to total dissolved solids (TDS) levels—higher in the western lakes than the eastern ones, particularly in Lake Leixudong. However, an observed freshening trend poses challenges for future resource exploitation. The study attributes Rb and Cs enrichment primarily to high-content thermal spring inputs, water evaporation, and water-rock interactions, with Rb typically exceeding Cs (Rb/Cs > 1) except in specific lakes like Yima Lake and parts of Qingshai Lake. Hydrogen-oxygen isotopes indicate mixed sources, including atmospheric precipitation, magmatic water, and river/groundwater inputs. This research advances the understanding of Rb and Cs enrichment mechanisms in Hoh Xil salt lakes and provides a scientific foundation for sustainable resource management.
Hydrochemical Characteristics and Influencing Factors of Lakes in Hoh Xil
A significant desalination and expansion of lakes in Qinghai Hoh Xil since the 1980s have been linked to climate change, with precipitation and evaporation identified as dominant factors. The study analyzed hydrochemical data from 2020, revealing that 14 lakes in the region include brackish-water, salt, salt-water, and freshwater types, primarily controlled by water-rock reactions and evaporation. Major ions follow a distinct abundance pattern (Na+ > Mg2+ > K+ > Ca2+; Cl– > SO42– > HCO3– > CO32–), with hydrochemical composition dominated by Cl-Na types except for one freshwater lake. These findings underscore the critical role of climate in shaping inland lake evolution on the Qinghai-Tibet Plateau.
Incidence and risk factors of acute mountain sickness during ascent to Hoh Xil and the physiological responses before and after acclimatization
Acute mountain sickness (AMS) affects over half of individuals ascending to Hoh Xil at 4,200 meters, with symptoms including headache, dyspnea, and dizziness. The study found that lower oxygen saturation (SpO₂) and higher heart rate (HR) upon exposure to high altitude correlate with AMS susceptibility. Alcohol consumption emerged as a potential risk factor, while anthropometric changes were more pronounced in those experiencing AMS before and after acclimatization. Oxygen therapy mitigated AMS-induced tachycardia but did not alter SpO₂ or symptom resolution time. These findings highlight physiological responses to high-altitude exposure and the effectiveness of acclimatization.
Spatiotemporal Distribution Characteristics and Influencing Factors of Freeze–Thaw Erosion in the Qinghai–Tibet Plateau
Freeze–thaw (FT) erosion, a significant yet understudied soil erosion type in cold regions, covers 1.61 million km² of the Qinghai–Tibet Plateau (QTP), accounting for 61.33% of its total area. Moderate to strong erosion intensity affects 38.37% of this region, predominantly in high mountain and hilly areas of the Hoh Xil frozen soil region. The study, using analytic hierarchy process (AHP)-based weights and a comprehensive evaluation index method, identified 11 key influencing factors—meteorological, vegetation, topographic, geomorphological, and geological—to assess FT erosion intensity. Findings suggest that climate warming, humidification, and permafrost degradation may exacerbate FT erosion in the future, posing risks to the QTP's fragile ecological environment. This research provides critical insights for preventing erosion and guiding ecological restoration efforts.
Tibetan Antelope: Hoh Xil, China
Tibetan antelope migrations in Hoh Xil, China, are mapped and analyzed in this fact sheet, offering the most comprehensive scientific understanding of their movement patterns as of 2024. The study combines field observations with digital mapping to create an interactive atlas, providing critical insights into the behavior and habitat use of this endangered species. These findings support conservation efforts by identifying key migration routes and threats, such as climate change and human activity, while contributing to the Global Initiative on Ungulate Migration (GIUM). The research serves as a foundational resource for both scientific communities and policymakers aiming to protect these vital ecosystems.
Characterizing the Water Storage Variation of Kusai Lake by Constructing Time Series from Multisource Remote Sensing Data
A significant shift in the water storage variation patterns of Kusai Lake (KL) on the Qinghai–Tibet Plateau, triggered by the 2011 outburst of Zhuonai Lake (ZL), has been identified for the first time. The study revealed that while pre-outburst LWS variations were dominated by 1-year and 3.5-year cycles without a semi-annual signal, post-outburst dynamics showed a strong semi-annual oscillation and amplified annual fluctuations. This change was directly linked to altered recharge patterns caused by the ZL outburst, rather than precipitation, evaporation, or glacier changes. The research utilized multisource remote sensing data to construct high-resolution time series (1990–2022) for lake level, area, and water storage, achieving accuracies validated against DAHITI standards. This method offers a novel approach for monitoring short-period variabilities in Tibetan lakes lacking hydrological data, providing critical insights into the downstream impacts of glacial lake outburst events.
Climatic characteristics of precipitation change and its multiscale causes over Central Qinghai–Tibet Plateau
A shift from energy to water limitation as the dominant factor for midsummer drought (MSD) in the Hoh Xil region of Qinghai–Tibet Plateau has been identified, marking a significant change in precipitation dynamics. The study reveals that since 2005, the region has experienced a drying-warming trend, with altered water vapor balance directly causing MSD. Located at the transition between westerlies and Indian monsoon, Hoh Xil's evaporation capacity plays a pivotal role in MSD occurrence. This research advances understanding of precipitation anomalies on the plateau, offering insights into climate change impacts under global warming.
Extracting water body data based on SDWI and threshold segmentation: A case study in permafrost area surrounding Salt Lake in Hoh Xil, Qinghai-Tibet Plateau, China
Researchers demonstrate that the Sentinel-1 dual-polarized water index (SDWI), combined with threshold segmentation, is an effective and efficient method for extracting water body data in permafrost areas, particularly under cloudy conditions. Using SAR imagery from 22 August 2022, the study successfully mapped the Hoh Xil Salt Lake and its surrounding lakes on China's Qinghai-Tibet Plateau (QTP), where optical remote sensing was hindered by clouds. The findings highlight SDWI's superiority over single-polarized VV or VH images, offering a robust alternative for large-scale water monitoring in fragile ecosystems like the QTP. This approach mitigates cloud-related errors and supports environmental impact prediction and disaster mitigation efforts.
Field Radiometric Calibration of a Micro-Spectrometer Based on Remote Sensing of Plateau Inland Water Colors
A breakthrough in radiometric calibration of micro-spectrometers enables accurate remote sensing reflectance (Rrs) measurements of plateau inland water bodies, including unmanned areas like Qinghai Hoh Xil. Researchers demonstrated that commercial micro-spectrometers, when field-calibrated using diffuse reflectance plates, can achieve mean absolute percentage differences (MAPD) as low as 5.11% compared to traditional spectrometers. This method provides the first in situ spectral data for remote water bodies like the Hoh Xil and Qarhan Salt Lake, overcoming challenges in unmanned regions. The study highlights that calibration coefficients vary by fiber type and integration time, offering a practical solution for precise Rrs measurements in challenging environments.
MT-InSAR Unveils Dynamic Permafrost Disturbances in Hoh Xil (Kekexili) on the Tibetan Plateau Hinterland
Dynamic permafrost disturbances are rapidly reshaping the remote Qinghai Hoh Xil region on the Tibetan Plateau, threatening even its secluded hinterland. Using Multi-temporal Interferometric Synthetic Aperture Radar (MT-InSAR), researchers mapped ground motions across 200,000 km² from 2015 to 2020, revealing widespread permafrost thawing—characterized by subsidence rates exceeding 2 mm/year and periodic deformations over 2 mm. Thawing was most pronounced in flat or gentle-slope areas, with cumulative deformation closely linked to permafrost degradation depth. Thermokarst landforms, including retrogressive thaw slumps and lakes, emerged and evolved as a result, particularly near large lakes where spatial clustering of thermokarst features indicated accelerated thaw. The study also identified significant lag times between seasonal ground motion and land surface temperature, underscoring the complex response of permafrost to climate change. This first-of-its-kind MT-InSAR analysis highlights the vulnerability of even the most isolated regions on the Tibetan Plateau to permafrost degradation.
No significant provenance changes in the Hoh Xil Basin, central-northern Tibetan Plateau, from the Late Cretaceous to the Early Miocene
A new study reveals that the Hoh Xil Basin in central-northern Tibet experienced no significant provenance changes from the Late Cretaceous to the Early Miocene, suggesting established topographic relief since at least 37 million years ago. The research integrated detrital zircon data, paleocurrent directions, petrological textures, sedimentary facies, and isotopic evidence from multiple sub-basins, indicating that the Tanggula Range has been the primary source region for the Hoh Xil Basin throughout this period. While minor contributions from the Fenghuo Range emerged in the Late Oligocene-Early Miocene, the overall basin remained consistent, implying surface deformation and uplift driven by tectonic collisions rather than crustal shortening. The findings suggest that additional uplift since the Middle Miocene may have been caused by mantle lithosphere removal or magmatic inflation.
Permafrost characteristics and potential influencing factors in the lake regions of Hoh Xil, Qinghai-Tibet Plateau
Research on permafrost around large alpine lakes in the Hoh Xil region of the Qinghai-Tibet Plateau reveals that these lakes have only a marginal thermal effect on surrounding permafrost, with cold permafrost extensively developed and ground temperatures below −1.0℃. The study found significant differences in ground temperature between boreholes within and outside lake basins, attributing this to high soil water content. Latent heat effects play a crucial role in buffering permafrost temperature increases under climate warming, while salinity weakens thermal erosion effects. The findings suggest that permafrost thermal regimes are influenced by both altitude and soil water content, providing insights into the interaction between frozen ground, lakes, and the atmosphere.
Revisiting the mechanisms of mid-Tertiary uplift of the NE Tibetan Plateau
A new model proposes that small-scale mantle convection beneath northeast Tibet, impeded by thicker cratonic lithosphere, drove mid-Tertiary surface uplift and volcanism. Contrary to prior theories attributing uplift to crustal shortening, this study's comprehensive analysis of stratigraphy, sedimentology, and volcanism in the West Qinling, Hoh Xil, and Qaidam basins reveals synsedimentary normal faults indicating supracrustal stretching and widespread mid-Tertiary magmatism. The absence of volcanics in the Qaidam basin further supports this edge-driven convection mechanism, offering a unified explanation for key geological phenomena that previous models could not reconcile.
Seasonal Variation of Gut Microbial Composition and Metabolism in Tibetan antelopes in Hoh Xil National Nature Reserve
Research on Tibetan antelopes in Qinghai Hoh Xil reveals significant seasonal variation in gut microbial composition and metabolism, which plays a crucial role in their adaptation to environmental fluctuations. The study found that while microbial diversity was higher during the cold season (XB), metabolic activity, particularly in purine and pyrimidine pathways, peaked in the warm season (DA). Using untargeted metabolomics and 16S rRNA gene-sequencing, scientists identified 532 metabolites and 62 enriched metabolic pathways, highlighting a strong correlation between gut microbiota shifts and seasonal metabolic changes. These findings provide critical insights for the conservation management of this endangered species.
Spatial-temporal variations of surface water area during 1986–2018 in Qinghai Province, northwestern China based on Google Earth Engine
Qinghai Province, known as the 'Water Tower' of northwestern China, has experienced significant expansion in its surface water area from 1986 to 2018, primarily driven by rising temperatures and increased precipitation. This trend was most pronounced in the Qaidam Basin, Hoh Xil Nature Reserve, and Qinghai Lake. Researchers leveraged Google Earth Engine (GEE) cloud processing to analyze spatial-temporal variations of surface water, providing critical insights into the ecological impacts of climate change on this vital region.
Spatiotemporal variations and overflow risk analysis of the Salt Lake in the Hoh Xil Region using machine learning methods
Researchers have identified that the Salt Lake in Qinghai Hoh Xil, following the 2011 Zonag Lake outburst, is rapidly expanding at a rate of approximately 350% across all directions, primarily toward the southeast. Without intervention such as an emergency drainage channel, machine learning models predict the lake's overflow could occur as early as 2020 and potentially as late as 2031. The study employed Classification and Regression Trees (CART), Random Forest (RF), and Support Vector Machine (SVM) algorithms to analyze spatiotemporal variations from 1973 to 2021, with RF demonstrating superior accuracy in lake area extraction (KAPPA = 0.98, overall accuracy = 0.99). The normalized difference water index was found to be a key feature variable. This research highlights the potential risks posed by such hydrological changes and underscores the effectiveness of machine learning in predicting environmental shifts.
Differences in bacterial diversity, composition, and community networks in lake water across three distinct regions on the Qinghai-Tibet Plateau
Bacterial diversity and composition in lake water vary significantly across three distinct regions on the Qinghai-Tibet Plateau (QTP): Hoh Xil (HX), Yellow River Headwater (YRH), and Qaidam (QD). HX exhibits markedly lower bacterial alpha-diversity compared to YRH and QD, with Bacteroidetes dominating in HX (46.07%) while Proteobacteria are predominant in QD (42.45%) and YRH (43.64%). Environmental factors such as altitude, total nitrogen, and pH play crucial roles in shaping bacterial communities, with altitude being the most influential in QD, total nitrogen in YRH, and pH in HX. Spatial factors also significantly impact bacterial composition in QD and HX, whereas environmental factors alone drive community structure in YRH. Network analyses reveal that while QD's bacterial network is the most complex, HX's network exhibits the highest stability, followed by QD and YRH.
Domino effect of a natural cascade alpine lake system on the Third Pole
A domino effect in the Qinghai Hoh Xil alpine lake system, triggered by climate change and geological events, has significantly altered the region's hydrology. The study, using advanced cryosphere-hydrology-lake-dam modeling, found that increased precipitation, accelerated ice and snow melting, and short-term heavy precipitation or earthquake events caused a 2011 outburst in Lake Zonag. This led to a quadrupling of Lake Yanhu's area due to tripling inflows from 0.25 km³/year (1999-2010) to 0.76 km³/year (2012-2018). Permafrost degradation, while marginally impacting lake inflows, was critical for lakeshore stability. The findings highlight a high-risk scenario for the downstream Qinghai-Tibet Railway, emphasizing the need for timely adaptation and mitigation strategies.
Lake Water Storage Changes in Northeast Hoh Xil Observed by Cryosat-2 and Landsat-5/7/8: Impact of the Outburst of Zhuonai Lake in 2011
A significant shift in the hydrological system of northeast Hoh Xil, Qinghai Hoh Xil, was triggered by the 2011 outburst of Zhuonai Lake (ZL). This event altered water storage dynamics across four lakes, with a notable reduction in the correlation between individual lake water storage changes (LWSCs) and basin-wide trends post-outburst. Before 2011, all lakes showed increasing water volumes, totaling 1.49 ± 0.08 gigatonnes, primarily in ZL and Kusai Lake (KL). However, after the outburst, three upstream lakes exhibited stagnant LWSCs despite continued basin-wide increases, with over 80% of new water accumulating in Salt Lake (SL), which maintained a strong correlation (0.91) with basin trends. The study leveraged Cryosat-2 and Landsat satellite data to construct monthly LWSC records from 2009 to 2016, validating lake levels and areas through interpolation and digital elevation models (DEM). This approach revealed the outburst's profound impact on regional hydrology.
Lateral Growth Mechanism of Proto‐Tibetan Plateau in the Late Paleogene: Implications From Detailed Crustal Structures of the Hoh Xil Basin
Researchers have uncovered the lateral growth mechanism of the proto-Tibetan Plateau during the Late Paleogene, revealing that the Hoh Xil Basin (HXB) experienced significant crustal thickening to over 70 km, surpassing the protoplateau's crust. This thickening cannot be solely attributed to upper crustal shortening, suggesting a more complex process at play. Using a dense nodal array and receiver function method, the study imaged north-dipping interfaces in the lower crust, indicating widespread imbrication structures. The findings propose that isostatic-driven adjustments and northward injection of the protoplateau's lower crust were key factors in elevating the HXB during this period.
Lithological and Geochemical Characteristics of Miocene Lacustrine Stromatolites from the Wudaoliang Formation in the Hoh Xil Basin, Northern Tibetan Plateau: Implications for the Paleo-environment
Miocene lacustrine stromatolites from the Wudaoliang Formation in Qinghai Hoh Xil, Northern Tibetan Plateau, reveal critical insights into paleo-environmental conditions. These stromatolites, characterized by dense and porous laminae, indicate a warm, arid-dominated climate conducive to their growth during the Cenozoic era. Oxygen isotope analysis suggests periodic hydrological changes in the basin, with evidence of decreased salinity over time. Geochemical data, including trace elements and rare earth elements (REE), show depletion in most upper continental crust elements and a slight negative Eu anomaly, further supporting the interpretation of environmental shifts. The study utilizes lithological observations, geochemical analysis, and X-ray diffraction (XRD) to reconstruct the paleo-salinity and hydrological dynamics of the Miocene Hoh Xil Basin.
Monitoring glacier terminus and surface velocity changes over different time scales using massive imagery analysis and offset tracking at the Hoh Xil World Heritage Site, Qinghai-Tibet Plateau
Glaciers at the Qinghai Hoh Xil World Heritage Site exhibit asynchronous changes over decadal and annual scales, posing significant threats due to climate change. This study reveals distinct glacier behavior patterns: general degradation with one rapidly advancing glacier in XinQing Feng (XQF), slow recession in Malan (ML), and complex seasonal degradation in Galadandong (GLDD). Using advanced techniques like Google Earth Engine (GEE) for large-scale geomorphic change detection and offset tracking (OT) for high-accuracy, continuous displacement monitoring, researchers demonstrated that GEE is effective for detecting substantial changes with an uncertainty error of ~8 m/yr, while OT excels in precision up to 1 m/yr. The integration of these methods highlights their complementary roles in monitoring glacier dynamics, crucial for sustainable conservation and hazard mitigation strategies at UNESCO World Heritage Sites.
Multi-UAV Collaboration to Survey Tibetan Antelopes in Hoh Xil
A multi-UAV collaboration method significantly reduces survey time for Tibetan antelope populations, achieving over 6 square kilometers of coverage in about 2 hours—a feat that previously required over 4 days with human-piloted single drones. The approach encodes path planning as a satisfiability modulo theory problem using one-hot encoding, generating feasible paths iteratively and optimizing them based on UAV endurance and camera parameters. This method leverages a generic few-shot detector for accurate counting (over 97% accuracy) without specialized training, demonstrating its potential for efficient wildlife monitoring in dynamic environments like Qinghai Hoh Xil.
Study of Condensate Absorption Capacity in Exposed Soil when Water Recedes at the Bottom of Hoh Xil Lake, Qinghai
A study on Qinghai Hoh Xil's exposed sandy lake bottom reveals that artificial water-retention layers significantly enhance condensate absorption capacity compared to bare ground, with unidirectional condensation occurring three times more frequently and total condensate volumes being 2.588 times greater under these conditions. Conducted using a micro-osmometer in July 2021, the research examined condensate variation, formation time, volume, and absorption capacity across artificial water-retention layers and bare ground, both underpass and sealed conditions. Findings indicate that permafrost influences condensation dynamics, with zero-flux surface transport occurring within 30 cm of the soil surface. The study provides critical insights for vegetation restoration in ecologically degraded lake bottom areas.
Study on the retention effect of condensed water at different soil levels in exposed areas of Hoh Xil lake upon water recession
An artificial water retention layer at 0–5 cm depth significantly enhances the adsorption of soil moisture through condensation, demonstrating superior performance compared to deeper layers. This study found that such a layer increases condensed water vapor from near-surface air by up to three times, with the highest frequency and amount of unidirectional condensation occurring in this shallow range. The findings also reveal that permafrost in Hoh Xil, Qinghai, creates a heat zero-flux plane migrating 30 cm below the surface, influencing moisture retention dynamics. These insights provide a theoretical foundation for improving condensate absorption capacity and supporting vegetation restoration in ecologically degraded lake bottom areas.
Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust
Aeolian dust from the Qinghai-Tibet Plateau (TP) exhibits distinct uranium isotopic signatures that serve as a tracer for its provenance, revealing complex interactions between erosion, transport, and climate. The study found that dust from high-elevation glacial areas like the Qilian and Himalayan Mountains shows higher (234U/238U) ratios due to accelerated erosion and comminution processes, while non-glacial regions exhibit lower values. These isotopic patterns contrast with global dust sinks, suggesting TP dust undergoes both short-term (tectonic, glacial) and long-term residence influences. The research used uranium isotope ratios and comminution age methods on surface dust and glacier samples to constrain erosion sources, demonstrating that TP-derived dust significantly contributes to Asian and Northern Hemisphere atmospheric dust loads.
Hydrological ecosystem changes and impacts after the Zonag Lake outburst in Hoh Xil of Tibetan Plateau
The outburst of Zonag Lake in Hoh Xil, Tibetan Plateau, in 2011 triggered significant and lasting changes to the regional hydrological ecosystem, threatening the ecological health of a UNESCO World Heritage Site. Research using remotely sensed data (2000–2020), meteorological observations, and field surveys revealed that the event altered lake connectivity, increased sandstorm activity, and degraded vegetation, particularly in lambing and Tibetan antelope habitats. Downstream Yanhu Lake reached record high levels, necessitating emergency diversion measures to prevent overflow. These changes pose risks to infrastructure—including the Qinghai-Tibet highway and railway—as well as fluvial geomorphology in the Yangtze River's northernmost sources, underscoring the event's far-reaching environmental and socio-economic impacts.
Investigation of dynamic lake changes in Zhuonai Lake–Salt Lake Basin, Hoh Xil, using remote sensing images in response to climate change (1989–2018)
Over the past three decades, the combined area of four lakes in the Zhuonai Lake–Salt Lake Basin, part of Qinghai Hoh Xilhas expanded by 18% due to climate change. This finding stems from an analysis of remote sensing data spanning 1989 to 2018, which revealed that increased precipitation and decreased lake evaporation were the primary drivers behind this expansion. Researchers used meteorological data from 28 stations and a single-layer lake evaporation model to quantify these changes, showing that annual evaporation declined sharply after 1995 while precipitation rose, leading to net growth in lake volume. Lake evaporation emerged as the dominant factor influencing areal changes, with total evaporation ranging between 615.37 and 921.66 mm annually during the study period.
Organic Geochemical Characteristics of Mudstone and Marl from Western Hoh Xil Basin of Tibet
Research on mudstone and marl from the western Hoh Xil Basin, Tibet, reveals that these Tertiary lacustrine deposits formed under stratified, high-productivity conditions with a transition to more humid paleoclimate. Organic geochemistry analysis showed that organic matter originated primarily from bacteria, algae, and higher plants, with type II and III kerogen in mudstones indicating thermal immaturity, while marlite displayed type I-II1 kerogen at low to moderate maturity. Biomarkers, including odd-over-even predominance of long-chain n-alkanes and low Pr/Ph ratios (0.11–0.36), supported a reducing environment with stratified water columns. The study integrated sedimentary facies analysis, maceral composition, and carbon isotope data (δ13Corg) to reconstruct depositional conditions in the Miocene Wudaoliang Formation and Oligocene Yaxicuo Group.
Research achievements of the Qinghai-Tibet Plateau based on 60 years of Aeromagnetic Surveys
Aeromagnetic surveys over the past six decades have revealed that the Qinghai-Tibet Plateau is characterized by a dual-layer magnetic structure, featuring shallow east-west and northwest-trending anomaly zones overlain by deeper south-north trending zones. This 'flyover' geological pattern suggests complex tectonic interactions, including continent-continent collisions in the Yarlung-Zangbo suture zone, which formed due to twice subduction of the Indian Plate beneath the Eurasian Plate. The study also identified a giant negative aeromagnetic anomaly, indicating a deep thermal-tectonic zone, and delineated 21 mineral resource prospecting areas with thousands of ore-bearing anomalies. Additionally, it clarified the Plateau's boundaries and its composition of four stitched orogens, while highlighting the Qiangtang Basin's potential for oil and gas due to its stable northern basement.
Thermal Alteration History of the Fenghuoshan Group, Hoh Xil Basin, Northern Tibetan Plateau: Insights From Clumped Isotope Thermometry
Research on the Fenghuoshan Group in Qinghai Hoh Xil reveals that carbonates underwent significant thermal alteration during deep burial and exhumation, potentially skewing paleoclimatic reconstructions. Clumped isotope thermometry (Δ47) analysis of 30 carbonate samples from the ∼4.5 km-thick group showed temperatures ranging from 51 to 132°C—well above surface conditions—suggesting burial-related recrystallization rather than solid-state reordering. The study proposes that carbonates equilibrated with ambient burial temperatures during progressive microscale recrystallization, modifying their Δ47 signatures. This finding underscores the need for careful diagenetic assessment when using clumped isotopes for paleoclimatic or paleo-elevation studies in sedimentary basins.
A chromosome‐scale reference genome and genome‐wide genetic variations elucidate adaptation in yak
Researchers have developed a high-quality chromosome-scale reference genome for the yak, significantly improving upon previous assemblies. This new assembly, BosGru_PB_v1.0, leverages long-read sequencing and chromatin interaction technologies to enhance sequence continuity, reduce repetitive structure ambiguity, and improve gene model completeness compared to earlier versions like BosGru_v2.0. The study also generated de novo genome assemblies for seven domestic yak breeds and one wild yak from Hoh Xil, revealing higher genetic diversity in wild yaks despite historical bottlenecks. By comparing these genomes, the team identified breed-specific sequences and genes, which could aid in breed identification and provide insights into the genetic adaptations of this hardy livestock species to high-altitude environments.
Do Protected Areas Improve Ecosystem Services? A Case Study of Hoh Xil Nature Reserve in Qinghai-Tibetan Plateau
Protected areas (PAs) significantly enhance ecosystem services, as demonstrated by a case study of the Hoh Xil Nature Reserve (HXNR) on China's Qinghai-Tibetan Plateau. The research found that HXNR's ecosystem service value (ESV) increased markedly after its designation as protected, contrasting with nearby non-protected areas where ESV declined due to urban expansion and desertification. Hotspot analysis revealed that HXNR's core zones were particularly effective in preserving ecosystem services. The study used remote sensing data, a modified benefit transfer method adjusted with NDVI, and hotspot analysis to compare ESV changes between 1980 and 2018. These findings underscore the critical role of PAs in mitigating environmental degradation and sustaining ecological benefits.
Late Eocene–Oligocene High Relief Paleotopography in the North Central Tibetan Plateau: Insights From Detrital Zircon U–Pb Geochronology and Leaf Wax Hydrogen Isotope Studies
A new study reveals that the Hoh Xil Basin on the north central Tibetan Plateau experienced high relief paleotopography during the late Eocene to Oligocene, with source regions reaching elevations of approximately 4 kilometers. This discovery challenges traditional models of plateau growth by demonstrating a transition from foreland to hinterland basin, driven by northward propagation of upper crustal shortening and deep tectonic processes. Researchers used detrital zircon U–Pb geochronology and leaf wax hydrogen isotope analysis on sediments from the Yaxicuo Group in the Tuotuohe subbasin. The study suggests that these sediments were primarily sourced from the northern Qiangtang and Songpan-Ganzi terranes, with distinct age spectra indicating a watershed formation within the basin.
Map and Quantify the Ground Deformation Around Salt Lake in Hoh Xil, Qinghai-Tibet Plateau Using Time-Series InSAR From 2006 to 2018
Significant ground deformation around the Salt Lake in Qinghai Hoh Xil, Qinghai-Tibet Plateau, was detected using time-series InSAR from 2006 to 2018. Before the 2011 outburst of Zhuonai Lake, deformation rates were minimal (-5 to 5 mm/year). However, post-2014, deformation intensified dramatically, reaching up to -25 mm/year by 2018, correlating with rapid lake expansion and rising water levels. The study employed ENVISAT and Sentinel-1A SAR data, utilizing distributed scatterers and a temperature-related linear deformation model to quantify permafrost instability. Findings underscore the potential hazards of permafrost melting in this region, highlighting time-series InSAR as a critical tool for monitoring environmental changes.
Miocene Olivine Leucitites in the Hoh Xil Basin, Northern Tibet: Implications for Intracontinental Lithosphere Melting and Surface Uplift of the Tibetan Plateau
A new study reveals that the surface uplift of the Tibetan Plateau, particularly in the Hoh Xil Basin, was driven by the melting of potassium-enriched lithospheric mantle. Researchers analyzed 16 million-year-old olivine leucitites, which exhibit unique geochemical signatures indicating minimal crustal interaction and derivation from a phlogopite-lherzolite source. The study suggests that southward subduction of the Asian lithosphere post-India-Asia collision introduced potassium into the mantle, facilitating low-degree partial melting. This process not only generated voluminous magmatism but also contributed to over 1 km of surface uplift in the region.
Rapid expansion of lakes in the endorheic basin on the Qinghai-Tibet Plateau since 2000 and its potential drivers
Since 2000, lakes in the endorheic basin of the Qinghai-Tibet Plateau (QTP) have experienced rapid expansion, with significant variations across regions. While glacier retreat may contribute to lake growth, increasing annual precipitation emerges as the primary driver behind this phenomenon. Permafrost degradation further accelerates lake expansion by releasing meltwater from ground ice and soil moisture. Notably, lakes on the northern slope of the Gangdise Mountains, fed by rapidly retreating glaciers, remained stable or contracted, contrasting with significant expansions observed in non-glacier-fed lakes in the Hoh Xil region and central endorheic basin—primarily driven by the greatest increase in precipitation. This study analyzed spatial-temporal lake changes using Landsat images, meteorological data, glacier data, and permafrost monitoring data from 2000 to 2017, revealing statistically significant trends (0.01–26.29 km²/year) and highlighting the complex interplay of climate factors in shaping lake dynamics on the QTP.
Bacterial community in cold and alkaline environments of Hoh Xil basin in Qinghai–Tibet Plateau and isolation of potential sources of microbiota
Research on the bacterial communities in the Hoh Xil basin, Qinghai-Tibet Plateau, reveals distinct microbial diversity across cold and alkaline environments. The study identified 10 strains of bacteria, predominantly Pseudomonas (90.8%), with one strain, k9, showing optimal growth at high pH (10.0) and low temperature (5°C), along with the ability to produce multiple extracellular enzymes under alkaline and cold conditions. This suggests potential psychrophilic and alkaliphilic bacteria with biotechnological applications. The study used both culture-dependent and independent methods to analyze desert soil, saline-alkali land, saline-alkali wetland, and soda lake sediment samples, highlighting the unique microbial adaptations in this extreme environment.
Prevalence and Parasite Composition of Gastrointestinal Parasites in the Endangered Tibetan Antelope (Pantholops Hodgsonii) from the Calving Ground of Hoh Xil Nature World Heritage Site, Qinghai, China
A comprehensive survey of gastrointestinal parasites in the endangered Tibetan antelope (Pantholops hodgsonii) on its calving grounds at Qinghai Hoh Xil revealed widespread and diverse parasite infections. The study found that 93% of fecal samples tested positive for nematodes, 36% for cestodes, and an astonishing 99% for coccidian oocysts, with an average of 3.4 parasite species per individual. Coinfections involving five parasite genera were detected in 19% of samples, highlighting the complex parasitic burden faced by this vulnerable species. The high prevalence of Trichostrongylus, Marshallagia, and Eimeria infections suggests these parasites pose significant long-term risks, particularly as climate change increases warmth and moisture in the region. Researchers analyzed 238 fecal samples collected in July 2018 using flotation techniques to identify eggs, oocysts, and nematode larvae, providing critical baseline data for monitoring future health trends.
A wild yak survey in Chang Tang of Tibet Autonomous Region and Hoh Xil of Qinghai Province
Recent surveys reveal that the population of wild yaks (Bos grunniens) in the Qinghai-Tibet Plateau has increased since the 1990s, with estimates ranging from 11,222 to 21,072 individuals in Chang Tang, Tibet, and 659 to 1,793 in Hoh Xil, Qinghai. Despite this growth, the distribution area of wild yaks is shrinking due to climate change and intensifying human activities. The study, conducted between 2012 and 2014 using field data and published literature, highlights the need for stronger conservation actions to protect this endemic species in one of China's most ecologically significant regions.
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