Soil Carbon Balance in a Native Temperate Grassland in the Xilin River Basin of Inner Mongolia  

锡林河流域一个原生草原群落的碳素平衡研究(英文)

作　　者：李凌浩[1] 韩兴国[1] 王其兵[1] 白文明[1] 白永飞[1] 闫志丹[1] 陈全胜[1] 张焱[1] 杨晶[1] 李鑫[1] 宋世环[1] 

机构地区：[1]中国科学院植物研究所植被数量生态学开放研究实验室,北京100093

出　　处：《Acta Botanica Sinica》2002年第6期740-742,共3页Acta Botanica Sinica（植物学报：英文版）

基　　金：国家重点基础研究发展规划项目 (G2 0 0 0 0 1 86 0 3;G1 9990 434 0 7) ;中国科学院知识创新工程重大项目 (KSCX1_0 8_0 3)~~

摘　　要：Based on historical data and field investigation, some major fluxes and reserves of carbon were estimated, and a tentative analysis of the soil carbon balance was made in a native grassland community in the Xilin River basin of Inner Mongolia. Major results were reported as follows: 1) Annual average carbon input from above-ground biomass production was 79.8 g C(.)m(-2.)a(-1), and from root biomass to 30 cm. depth averaged 311.9 g C(.)m(-2.)a(-1). The summed mean annual carbon input of shoot and root materials in the study site was approximately 391.7 g C(.)m(-2.)a(-1). 2) The annual amount of above-ground biomass consumed by insects averaged 14.7 g C(.)m(-2.)a(-1), and the carbon output by leaching or light-chemical oxidation was 3.2 g C(.)m(-2.)a(-1) The annual evolution rate of CO2 from net soil respiration averaged 346.9 g C(.)m(-2.)a(-1), and the summed mean annual output was approximately 364.8 g C(.)m(-2.)a(-1). 3) A mature, steady-state system could be assumed for the community for which growth and decay were approximately in balance, with a net carbon accumulation of about 26.9 g C(.)m(-2.)a(-1). Based on the soil organic carbon density of the field, the turnover Irate of soil carbon in 0 - 30 cm depth was calculated to be 6.2%, with a turnover time of 16 years.野外调查与历史资料相结合 ,对内蒙古锡林河流域一个永久试验样地内的羊草 (Leymuschinensis (Trin .)Tzvel.)草原群落 (原生草原群落 )的碳素贮量、主要流量和周转速度等进行了估计。结果表明 :1 )该群落中地上部净初级生产的碳素固定量的多年平均值为 79.8gC·m-2 ·a-1 ,根系碳素输入量的多年平均值为 31 1 .9gC·m-2 ·a-1 ,碳素输入总量为 391 .7gC·m-2 ·a-1 ;2 )土壤净呼吸量为 34 6 .9gC·m-2 ·a-1 ,动物 (昆虫 )采食量 1 4 .7gC·m-2·a-1 ,地上立枯阶段的淋溶与光化学分解损失为 3 .2gC·m-2 ·a-1 ,碳素输出总量为 36 4 .8gC·m-2 ·a-1 ;3)该群落中碳素输入略大于输出 ,净积累速率为 2 6 .9gC·m-2 ·a-1 ,0 - 30cm土壤中的碳素周转速率为 6 .2 % ,周转时间为1 6年。

关 键 词：Leymus chinensis steppe carbon balance soil respiration turnover rate net primary productivity (NPP) 

分 类 号：S812[农业科学—草业科学]