Acta Geographica Sinica ›› 2001, Vol. 56 ›› Issue (1): 44-53.doi: 10.11821/xb200101006

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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 Online:2001-01-15 Published: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

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

CLC Number: 

  • X144