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Based on biomass investigations, soil respiration an d plant photosynthesis measurement of dominant trees in Hailuogou valley o f Mt. Gongga, Southwest China, the carbon (C) storage, absorption and release for several typical woodlands in sub-alpine zones have been di scussed. For Abies fabri forest of 3,000 m above sea level, the C stor age amount is 177.4 t/ha for above-ground biomass and 143.2 t/ha for s oil below-ground biomass. The annual gross C fixed by vegetation photo synthesis is 20-24 t/ha. The C release by canopy respiration is 3.0-5.5 t/ha for arbors and 10-19 t/ha for surface soil and roots. The annual net C f ixed of forest ecosystem is about 6.0-7.1 t/ha. At lower elevations, t he amount of C released by woodlands is higher than that of woods a t higher elevations. The C fixed capacity of renewed forest with middle-aged t rees is higher than that of mature forest. Before becoming over-matured forest, woodland is an important sink of C whereas bareland in woods is the source of atmospheric C.
Based on biomass investigations, soil respiration an d plant photosynthesis measurement of dominant trees in Hailuogou valley of Mt. Gongga, Southwest China, the carbon (C) storage, absorption and release for several typical woodlands in sub-alpine zones have been di scussed. For Abies fabri forest of 3,000 m above sea level, the C stor age amount is 177.4 t / ha for above-ground biomass and 143.2 t / ha for s oil below-ground biomass. The annual gross C fixed by vegetation photo synthesis is 20 -24 t / ha. The C release by canopy respiration is 3.0-5.5 t / ha for arbors and 10-19 t / ha for surface soil and roots. The annual net C f ixed of forest ecosystem is about 6.0-7.1 t / ha. At lower elevations, t he amount of C released by woodlands is higher than that of woods at higher elevations. The C fixed capacity of renewed forest with middle-aged t rees is higher than that of mature forest. Before becoming over-matured forest, woodland is an important sink of C rather bareland in woods is the so urce of atmospheric C.