The Carbon Accumulation and Dissipation Features of Sub-alpine Woodland in Mt. Gongga
贡嘎山亚高山林地碳的积累与耗散特征

Based on the biomass investigation, soil respiration and plant photosynthesis measurement of dominant trees in Hailuogou valley of Mt. Gongga, Southwest China, the carbon(C) storage, absorption and release for several typical woodland in sub-alpine zones have been discussed. For Abies fabri forest of 3000 m above sea level, the C storage amount is 177.4 t/hm 2 for plant above ground surface and 143.2 t/hm 2 for soil. The annual gross C fixed by vegetation photosynthesis is 20-24 t/hm 2 . The C release by canopy respiration is 3.0-5.5 t/hm 2 for arbors and 10-19 t/hm 2 for soil and roots. The total annual net C fixed in forest ecosystems is about 6.0-7.1 t/hm 2 . At lower position, the woodland released C amount is higher than that of woods at higher place. The C fixed capacity of renewed forest with middle-aged trees is higher than that of mature forest.