气候变化加剧，全球降水格局将发生显著变化，降雨量变化将直接影响生态系统碳循环过程。森林土壤呼吸在调节森林生态系统碳循环中起着重要的作用。黄土高原森林草原过渡带是气候敏感区，作为我国生态环境重点建设地区备受关注。本研究以我国黄土高原森林草原过渡带天然辽东栎林为研究对象，基于原位降雨控制实验、并结合野外同步监测以及实验室分析，分析土壤呼吸及其组分对降雨量变化响应的特征与规律；明确不同降雨梯度下的土壤微生物与根系关键生物学参数与过程，探究生物学适应策略；厘清土壤呼吸不同底物对降雨量变化响应特征，明确底物之间协同响应关系；揭示土壤微生物和根系及呼吸底物改变三者之间对降雨量变化响应的耦合机制，最终阐明土壤呼吸对降雨量变化响应的生物学驱动机制。以期为应对全球气候变化及科学合理建设布局黄土高原植被提供科学支撑。

Atmospheric circulation models predict the global rainfall patterns will change in the future, which may affect carbon cycling of terrestrial ecosystems. Soil respiration in forest plays an important role in regulating forest ecosystem carbon cycle. The forest-grass transition zone in Loess Plateau, which is a climate sensitive zone, is focused for eco-environmental construction in China. In this subject, based on rainfall manipulation experiment combining with field monitoring and lab analysis, the dynamics of response of soil respiration and its components to changing of precipitation are investigated in oak (Quercus liaotungensis) forest stand in forest–grassland transition zone of Loess Plateau for clarifying biological parameters and process of soil microbe and root, understanding their adaptive strategies. Besides, we examine the coordination relationship between substrates of soil respiration along with precipitation gradient, and then define the coupling mechanism of soil microbe, root and substrates, finally reveal the biological driving mechanism of soil respiration to changing of precipitation. Based on the study, theoretical basis and data would be provided for tackling climate change and forest management.