粗木质残体(Coarse Woody Debris ,CWD) 是森林生态系统中重要的结构性和功能性组成要素，在保持森林生态系统的完整性方面扮演着重要的角色，在森林生态系统中发挥着许多重要的、独特的生态功能。以西藏色季拉山原始冷杉林下粗死木质残体为研究对象，通过深入调查和研究冷杉林CWD的形态、储量、组成规律，碳素以及养分贮量，揭示色季拉山冷杉林的储量特征和分解等级以及空间分布格局和生态功能，为合理利用生物资源和充分发挥其生态价值、保护色季拉山区域生态稳定和实现森林可持续发展提供科学依据。

The coarse woody debris (CWD) is the important structural and functional elements of forest ecosystem, and it is playing the vital role in maintaining the ecosystem integrity, and also exerts the significant and unique impact ecology function in the forest ecosystem. The project will take the CWD as the research object and investigate its form, reserve volumes and composite rules in the Sejila Mountain in Tibet Plateau, and also study its storage capacity of Carbon and nutrients. Through the project implementation, we will reveal the reserves of the storage characteristic, decomposition levels and spatial distribution patterns and ecological functions of the fir forest in the Sejila Mountain, and it will provide a scientific basis for the biological resources reasonable using, its ecological value playing, region ecological stability and forest sustainable development.