Seasonal litterfall composition and carbon and nitrogen returns in New Zealand shrubland

Manuka–kanuka shrublands, significant carbon sinks in New Zealand, exhibit distinct seasonal patterns in litterfall composition and nutrient returns. Research at Tongariro National Park and Stoney Creek revealed that total litterfall ranges from 3557 to 4443 kg ha⁻¹ year⁻¹, with leaf material contributing 46–67%. Litterfall peaks during spring–summer months, with higher rates observed at the lower-altitude Stoney Creek site. Carbon inputs range between 1941 and 2448 kg C ha⁻¹ year⁻¹, while nitrogen inputs are between 28 and 37 kg N ha⁻¹ year⁻¹, predominantly in leaf material. Despite similar rainfall and shrub ages at both sites, litterfall rates differ, suggesting site-specific variations. The study highlights the importance of understanding litterfall dynamics to assess the resilience of these ecosystems under climate change.

Lambie, S. M., & Dando, J. (2020). Seasonal litterfall composition and carbon and nitrogen returns in New Zealand shrubland. Australian Journal of Botany, 67(8), 610–616. https://doi.org/10.1071/bt19070