地理学报

地理学报 ›› 2001, Vol. 56 ›› Issue (1): 44-53.doi: 10.11821/xb200101006

• 论文 • 上一篇    下一篇

草原土壤的碳氮含量及其与温室气体通量的相关性

耿远波1, 章申1, 董云社1, 孟维奇1, 齐玉春1, 陈佐忠2, 王艳芬2   

  1. 1. 中国科学院地理科学与资源研究所环境生物地球化学开放实验室,北京100101;
    2. 中国科学院植物研究所,北京100093
  • 收稿日期:2000-04-18 修回日期:2000-09-25 出版日期:2001-01-15 发布日期:2001-01-15
  • 基金资助:
    “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)

The Content of Soil Organic Carbon and Total Nitrogen and Correl Ativity between Their Content and Fluxes of CO22O and CH4 in Xilin River Basin Steppe

GENG Yuan bo1, ZHANG Shen1, DONG Yun she1, MENG Wei qi1, QI Yu chun1, CHEN Zuo zhong2, WANG Yan fen2   

  1. 1. Key Laboratory of Environmental Biogeochemistry, Institute of Geographic Sciences and Natural Resources Research,CAS, Beijing 100101,China;
    2. 1Institu te of B otany,CAS,Beijing 100101,China
  • Received:2000-04-18 Revised:2000-09-25 Published:2001-01-15 Online:2001-01-15
  • Supported by:
    The Key Basic Research Project of National Ninth Five Year Plan,No.95-22-02-01,and the National Natural Science Foundation of China,No.49971005

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320 | 73

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 、 N2O、 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 N2O通量显著相关 ,N2O通量与有机碳含量、C/N及 CO2 通量显著相关 ,且CO2 和 N2O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 N2O通量都没有显著相关性。

关键词: 土壤有机碳, 全N, 含量特征, 温室气体通量, 相关性

Abstract: 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 CO2, N2O and CH4 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 CO2 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 N2O. The fluxes of N2O were significantly positively correlated with the content of the soil organic carbon, soil C/N ratio soil and the fluxes of CO2. The fluxes of both CO2 and N2O had the successively decreasing trend along the precipitation gradient. The fluxes of CH4 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 CO2 and the fluxes of N2O.

Key words: soil organic carbon, soil total nitrogen, fluxes of greenhouse gases, content characteristic, correlativi

中图分类号: 

  • X144