贡嘎山东坡土壤有机质及氮素分布特征

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贡嘎山东坡土壤有机质及氮素分布特征

The distribution of soil organic matter (SOM) and nitrogen on Gongga Mountain was studied in this paper. The results showed that the content of SOM and nitrogen (N) of A horizon had an ascending trend with the increase of the elevation. The vegetation types distributed higher than the mixed broad-leaved and coniferous forest have the irregular trends. In the transitional zone vegetation such as mixed trees and treeline, the content of SOM and N is higher than other vegetation types. The distribution of SOM and N of A horizon is dependent on the synthetic effect of climate and vegetation types. The vertical distribution of SOM and N in soil profiles has the similar trends for all kinds of vegetation types, i.e., the content of A horizon is higher than that of the B and C horizons, which is the same to the distribution of dead animal and plant in soil. The soil C:N is between 7 and 25, which is relatively low comparing to the appropriate C:N of 25-30. The ratio of soil carbon to nitrogen (C:N)increases with the increase of the elevation, but its vertical distribution in soil horizons varies with different vegetation types. The N exists in SOM mainly in the form of organic nitrogen, and the soil C:N correlates significantly with SOM.

作者：王琳欧阳华彭奎 TIAN Yuqiang ZHANG Feng WANG Lin OUYANG Hua PENG Kui TIAN Yuqiang ZHANG Feng 作者单位：王琳,彭奎,TIAN Yuqiang,ZHANG Feng,WANG Lin,PENG Kui,TIAN Yuqiang,ZHANG Feng(Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China; Graduate School of Chinese Academy of Sciences,Beijing 100039,China)

欧阳华,OUYANG Hua(Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China)

刊名：地理学报（英文版） ISTIC SCI 英文刊名： JOURNAL OF GEOGRAPHICAL SCIENCES 年，卷(期)： 2004 14(4) 分类号： P9 关键词： Gongga Mountain vertical gradient soil organic matter nitrogen

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