Acta Geographica Sinica ›› 2004, Vol. 59 ›› Issue (6): 1012-1019.doi: 10.11821/xb200406025

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Distribution Characteristics of Soil Organic Matter and Nitrogen on the Eastern Slope of Mt. Gongga

WANG Lin1,2, OUYANG Hua1, ZHOU Caiping1, ZHANG Feng1,2, BAI Junhong1, PENG Kui1,2   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China)
    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2004-02-18 Revised:2004-06-15 Online:2004-11-25 Published:2004-11-25
  • Supported by:

    Key Project of National Natural Science Foundation of China, No.40331006

Abstract:

The distribution of soil organic matter (SOM) and nitrogen of Gongga Mountain were studied in this paper. The results showed that the contents of SOM and N of A horizon had an ascending trend with the increase of the elevation. The vegetation types distributed higher than the mixed broad-leaved conifer forest had the irregular trends. In the transitional communities such as mixed forest and treeline, the contents of SOM and N were higher than other vegetation types. The distribution of SOM and N of A horizon was determined by the mutual effect of climate and vegetation types. The vertical distribution of SOM and N in soil profile had the similar trends in all kinds of vegetation types, i.e., the content of A horizon was higher than that of the B and C horizons, which was the same to the distribution of dead animals and plants in soil. There were N accumulation peaks in A horizon of the transitional communities. The soil C:N is between 7 and 25, which is lower relative to the appropriate C:N of 25-30. The soil C:N increased with the increase of the elevation, but its vertical distribution in the soil profile varied with different vegetation types. The N in the SOM existed mainly in the form of organic nitrogen, and the soil C:N was significantly correlated with SOM.

Key words: Mt. Gongga, vertical gradient, soil organic matter, nitrogen