Biodiversity mitigates drought effects in the decomposer system across biomes

• 成果类型: Article
• 署名作者: Luan, Junwei; Li, Siyu; Liu, Shirong; Wang, Yi; Ding, Liping; Lu, Haibo; Chen, Lin; Zhang, Junhui; Zhou, Wenjun; Han, Shijie; Zhang, Yiping; Hattenschwiler, Stephan
• 署名单位: International Centre for Bamboo & Rattan; Chinese Academy of Forestry; Beijing Normal University; Beijing Normal University; Chinese Academy of Forestry; Experimental Center of Tropical Forestry, CAF; Qufu Normal University; Chinese Academy of Sciences; Xishuangbanna Tropical Botanical Garden, CAS; Universite PSL; Ecole Pratique des Hautes Etudes (EPHE); Institut Agro; Montpellier SupAgro; CIRAD; Centre National de la Recherche Scientifique (CNRS); Institut de Recherche pour le Developpement (IRD); Universite Paul-Valery; Universite de Montpellier
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-14691
• DOI: 10.1073/pnas.2313334121
• 发表日期: 2024-03-26
• 关键词: litter decomposition; CLIMATE-CHANGE; ecosystem productivity; microbial abundance; soil fauna; diversity; carbon; metaanalysis; increases; DYNAMICS

摘要

Multiple facets of global change affect the earth system interactively, with complex consequences for ecosystem functioning and stability. Simultaneous climate and biodiversity change are of particular concern, because biodiversity may contribute to ecosystem resistance and resilience and may mitigate climate change impacts. Yet, the extent and generality of how climate and biodiversity change interact remain insufficiently understood, especially for the decomposition of organic matter, a major determinant of the biosphere-atmosphere carbon feedbacks. With an inter - biome field experiment using large rainfall exclusion facilities, we tested how drought, a common prediction of climate change models for many parts of the world, and biodiversity in the decomposer system drive decomposition in forest ecosystems interactively. Decomposing leaf litter lost less carbon (C) and especially nitrogen (N) in five different forest biomes following partial rainfall exclusion compared to conditions without rainfall exclusion. An increasing complexity of the decomposer community alleviated drought effects, with full compensation when large- bodied invertebrates were present. Leaf litter mixing increased diversity effects, with increasing litter species richness, which contributed to counteracting drought effects on C and N loss, although to a much smaller degree than decomposer community complexity. Our results show at a relevant spatial scale covering distinct climate zones that both, the diversity of decomposer communities and plant litter in forest floors have a strong potential to mitigate drought effects on C and N dynamics during decomposition. Preserving biodiversity at multiple trophic levels contributes to ecosystem resistance and appears critical to maintain ecosystem processes under ongoing climate change.