青藏高原高寒草甸植物-土壤反馈对植物群落构建的作用机制研究

植物群落结构和功能对全球气候变化和人为干扰的响应是生态学研究的核心内容之一。近年来有研究表明，植物-土壤反馈可能在调控植物群落结构和功能动态中发挥着重要的作用。然而，人们对于气候变化下植物群落构建及多样性维持的土壤反馈机制还缺少实验研究。基于之前的工作基础，申请者拟以青藏高原高寒草甸这一高度敏感、脆弱的生态系统为研究对象，利用已开展的野外全球变化多因子长期实验和将实施的控制性反馈实验，深入研究长期氮素添加和温度升高影响下植物-土壤反馈的方向和强度及其在植物群落结构和功能变化中的作用。本研究的实施有望阐明全球变化下植物-土壤反馈的模式及潜在的作用机理，推进理解高寒草甸植物群落的构建和动态机制，为青藏高原地区及同类型退化草地恢复及可持续管理提供科学依据。

One of the goals in ecological research is to demonstrate the responses of plant community to global change and human disturbance. Recent studies suggest that plant-soil feedback may play an important role in driving plant community structure and dynamics. However, little is known about how climate change can influence plant community assembly and biodiversity maintenance through a mechanism of plant-soil feedback. By taking advantage of a research platform of long-term nitrogen addition and warming, and conducting greenhouse feedback experiments, we try to examine the direction and strength of plant-soil feedback in an alpine meadow on the Tibetan Plateau, and demonstrate how plant-soil feedback can drive plant community assembly. The present study is expected to reveal the mechanisms of community assembly and biodiversity maintenance via plant-soil feedback under global changes and provide data and theoretical support to guide the grassland management.