Correlations Between Plant Biomass and Soil Respiration in a Leymus chinensis Community in the Xilin River Basin of Inner Mongolia  

锡林河流域一个羊草群落中土壤呼吸与生物量之间的相关性分析(英)

作　　者：李凌浩[1] 韩兴国[1] 王其兵[1] 陈全胜[1] 张焱[1] 杨晶[1] 闫志丹[1] 李鑫[1] 白文明[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5期593-597,共5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 (G200 0 0 1860 3 G19990 43 40 7);中国科学院知识创新工程重大项目(KSCX1_0 8_0 3 )。~~

摘　　要：This paper reports on two years of measurement of soil respiration and canopy-root biomass in a Leymus chinensis community in the Xilin River basin of Inner Mongolia. Correlations between components of plant biomass and soil respiration rates were examined. From respiration data based on CO2 uptake by NaOH and corresponding root biomass values for each run of 10 plots, a linear regression of CO2 evolution rates on root dry weights has been achieved for every ten days. By applying the approach of extrapolating the regressive line to zero root biomass, the proportion of the total soil respiration flux that is attributable to live root respiration was estimated to be about 27% on average, ranging from 14% to 39% in the growing season in 1998. There were no evident relations between the total canopy biomass or root biomass and CO2 evolution rates, but a significant exponential relation did exist between tire live-canopy biomass and CO2 evolution rates.采用根系生物量梯度上土壤呼吸变化趋势线外推法对锡林河流域一个羊草 (Leymuschinensis (Trin .)Tzvel.)群落中根系呼吸占土壤总呼吸的比例进行了估计 ,对生物量各组分 (地上、地下部分 )之间以及它们与土壤呼吸间的相关性进行了分析。结果表明 :在测定年度 (1998年 )整个生长季的不同月份 ,该群落中根系呼吸量占土壤呼吸总量的比例在 14 %～ 39%之间 ,平均为 2 7% ;地上总生物量及根系生物量与土壤呼吸间的相关性较差 ,但地上活生物量与土壤呼吸间存在着显著的乘幂关系。上述结果与国外同类研究结果相比 ,具有很好的一致性。

关 键 词：root respiration total soil respiration temperate grassland plant biomass 

分 类 号：Q948[生物学—植物学]