粗木质残体是森林碳库重要组分，森林调查时经常忽略粗木质残体，研究也多局限于小尺度样方研究，由于资料不足和尺度限制，粗木质残体碳库估算具有很大的不确定性。粗木质残体分解与温度和水分密切相关，全球气候变化对这部分碳库会产生重大影响，为更好了解森林碳库动态，迫切需要掌握全球气候变化如何影响粗木质残体碳库，而我国未见相关报道。我国温带地区是全球变化敏感区，本项目选择温带地带性森林粗木质残体为研究对象，利用已建立的温带地带性森林固定大型监测样地，通过温带地带性森林固定大型监测样地野外调查，研究温带地带性森林粗木质残体碳库时空变异和影响因素，为精确估计温带地区碳贮量提供理论和技术支持；开展海拔梯度不同温度和降水的控制试验，明确CWD对增温和降水变化的响应模式和机制；综合野外调查和控制试验，利用模型定量预测不同情景粗木质残体碳库动态，提出合理管理粗木质残体方案。

Coarse woody debris (CWD) is most often excluded from forest inventory. There have been many site-level studies estimating carbon store of CWD. Compared with living biomass, there is usually higher uncertainty in estimating CWD stocks and fluxes, because of insufficient data and scale. .CWD store a large amount of carbon in the forest ecosystems and provide critical information about carbon dynamics and structures of forest ecosystems. There is mounting evidence that climate change (e.g., global warming, change of precipitation) have occurred. Local environmental conditions, in particular temperature and humidity, exert strong controls on the rate of CWD decomposition and respiration. There is a pressing need to understand the immediate and future consequences of these environmental changes on the carbon dynamics of CWD in forest ecosystems. No studies have been conducted to examine how the carbon store of CWD responds to the increasing global climate change such as global warming and change of precipitation in China. .The temperate zone is sensitive to global climate change in China. By a combination of field investigation, experiment, and modeling approach, this project will address three key scientific questions 1).What is the spatial and temporal patterns of carbon store of CWD in temperate zonal forest? 2).How will global climate change influence on the rate of CWD decomposition and respiration? And 3). How will carbon store of CWD change under different circumstances? Finally it will provide the reasonable management design of CWD.