摘要
通过采样分析研究内蒙古锡林河流域温带草原土壤有机碳及全 N的含量特征 ,探讨它们的含量与温室气体 CO2 、 N2 O、 CH4 通量的相关性 ,结果表明 :沿 470～ 1 50 mm年降水梯度线 ,土壤表层 (0～ 2 0 cm)有机碳含量从 2 .38%递减到 1 .2 3% ,全 N含量从 0 .2 1 8%递减到0 .1 36% ,而且放牧和开垦都有使有机碳及全 N含量降低的趋势 ;CO2 通量与有机碳含量、全N含量、C/N及 N2 O通量显著相关 ,N2 O通量与有机碳含量、C/N及 CO2 通量显著相关 ,且CO2 和 N2 O的通量都有沿降水梯度递减的趋势 ;CH4 通量与有机碳含量、全 N含量、C/N、CO2通量及 N2 O通量都没有显著相关性。
In the paper, the content characteristics of soil organic carbon and total nitrogen were studied, and correlativity between the content of soil organic carbon and total nitrogen and the fluxes of greenhouse gases CO 2, N 2O and CH 4 were analyzed. All the samples were taken from temperate steppe of Xilin River Basin in Inner Mongolia of China. The results showed that the content of organic carbon range in soil surface layer (0~20 cm) decreased successively from 2 38% to 1 23% and the content of total nitrogen from 0 218% to 0 136% along the precipitation gradient from 470 mm to 150 mm. The contents of the soil organic carbon and total nitrogen had the decreasing trend due to grazing and cultivation. The fluxes of CO 2 were significantly positively correlated with the content of the soil organic carbon, the content of soil total nitrogen, C/N ratio and the fluxes of N 2O. The fluxes of N 2O were significantly positively correlated with the content of the soil organic carbon, soil C/N ratio soil and the fluxes of CO 2. The fluxes of both CO 2 and N 2O had the successively decreasing trend along the precipitation gradient. The fluxes of CH 4 had no significant correlativity with the content of soil organic carbon, the content of soil total nitrogen, C/N ratio in soil, the fluxes of CO 2 and the fluxes of N 2O.
出处
《地理学报》
EI
CSCD
北大核心
2001年第1期44-53,共10页
Acta Geographica Sinica
基金
"九五"国家重大基础研究项目(95-22-02-01)
国家自然科学基金资助项目!(49971005)
关键词
有机碳
温室气体通量
全氮含量
草原土壤
相关性
soil organic carbon
soil total nitrogen
fluxes of greenhouse gases
content characteristic
correlativity
