| The carbon accumulation and dissipation features of sub—alpine woodland in Mt.Gongga |
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| 作者姓名： | CHENGGenwei |
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| 作者单位： | InstituteofMountainHazardsandEnvironment,CAS,Chengdu610041,China |
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| 基金项目： | The National Natural Science Foundation of China, G1998040800,The Key Project for Basic Research on the Tibetan Plateau of CAS, No.KZ951-A1-204,No.KZ95T-06 |
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| 摘 要： | Based on biomass investigations,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 woodlands in sub-alpine zones have been discussed.For Abies fahri forest of 3,000 m above sea level,the Cstorage amount is 177.4t/ha for above-ground biomass and 143.2 t/ha for soil below-ground biomass. The annual gross C fixed by vegetation photosynthesis 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 fixed of forest ecosystem is about 6.0-7.1 t/ha.At lower elevations,the 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 trees 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.
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| 关 键 词： | 土壤 生物调查 呼吸作用 植物 光合作用 碳平衡 林地 大气 |
| 收稿时间： | 10 June 2002 |
| 修稿时间： | 15 November 2002 |
The carbon accumulation and dissipation features of sub-alpine woodland in Mt. Gongga |
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| CHENGGenwei.The carbon accumulation and dissipation features of sub-alpine woodland in Mt. Gongga[J].Journal of Geographical Sciences,2003,13(1):13-18. |
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| Authors: | CHENG Genwei LUO Ji |
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| Institution: | (1) Institute of Mountain Hazards and Environment, CAS, 610041 Chengdu, China |
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| Abstract: | 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. |
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| Keywords: | Mt Gongga forest community C balance |
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