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《Scientia Silvae Sinicae》 2009-08
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Characteristics of Biomass,Carbon Accumulation and Its Spatial Distribution in Cunninghamia lanceolata Forest Ecosystem in Low Subtropical Area

Kang Bing~ 1,2 Liu Shirong~2 Cai Daoxiong~3 Lu Lihua~3 (1.College of Life,Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100;2.Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry Beijing 100091;3.Experiment Center of Tropical Forestry,Chinese Academy of Forestry Pingxiang 532600)  
Carbon accumulation and distribution were studied in three plots of a 13 years old Chinese fir (Cunninghamia lanceolata) forest in Daqingshan,Guangxi. The results showed that the average carbon concentration in all organs was in the following order: leaf (510.5)bark (501.8)wood (485.1)root (476.5)branch(462.1) (g·kg~ -1 ). The carbon concentration of soil (to 60 cm depth) ranged from 11.4 to 21.1 (g·kg~ -1 ),with an average of 16.6 (g·kg~ -1 ). Carbon concentration of surface soil (to 20 cm) was higher than the other layer. The average carbon concentrations (g·kg~ -1 ) in different layers were in the order as: trees (497) shrub (437.5) standing litters (437.5)herb (407.8). The carbon storage of the forest ecosystem was in order of soil layervegetation standing litter. Of total average carbon,23.87% was in vegetation component,74.27% in soil (60 cm depth),and only 1.86% in standing ground litter layer. The tree layer occupied 22.93% of total carbon storage in the ecosystem and 96.07% of carbon storage in the vegetation layer. The carbon storage in different organs was positively related to the biomass of corresponding organs. Trunk accumulated the highest carbon storage,comprising 58.40% of carbon storage in tree layer. Secondly,root made up 20.09% of total tree carbon. The annual net productivity of Chinese fir plantation was 10.10 t·hm~ -2 a~ -1 ,stored carbon up to 4.67 t·hm~ -2 a~ -1 ,equal to 17.13 t·hm~ -2 a~ -1 of CO_2. Chinese fir plantation was an important sink of atmospheric CO_2. But its capacity of C sequestration decreased gradually in this region.
【Fund】: 国家林业科技支撑资助项目(2006BAD03A0402 2006BAD03A040101);; 西北农林科技大学人才基金
【CateGory Index】: S718.556
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