地理学报 ›› 2004, Vol. 59 ›› Issue (6): 1012-1019.doi: 10.11821/xb200406025

• 土壤 • 上一篇    下一篇

贡嘎山东坡土壤有机质及氮素分布特征

王琳1,2, 欧阳华1, 周才平1, 张锋1,2, 白军红1, 彭奎1,2   

  1. 1. 中国科学院地理科学与资源研究所, 北京 100101;
    2. 中国科学院研究生院, 北京 100039
  • 收稿日期:2004-02-18 修回日期:2004-06-15 出版日期:2004-11-25 发布日期:2004-11-25
  • 作者简介:王琳 (1978-), 女, 博士生, 主要从事陆地生态系统格局与过程方面的研究。E-mail: lwang@igsnrr.ac.cn
  • 基金资助:

    国家自然科学基金重点项目 (40331006)

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

摘要:

对贡嘎山东坡自然垂直带土壤有机质和氮素的分布特征的研究表明,贡嘎山东坡表层土壤有机质和全氮含量随海拔升高有上升趋势,但在针阔混交林以上出现波动,在群落过渡带处出现显著峰值,气候和植被类型的综合作用决定了有机质和氮素的空间分布。土壤有机质和氮素在土壤剖面中的垂直分布趋势一致,凋落物层和土壤A层高于B、C层,这与动植物残体在土壤中的垂直分布格局类似。群落过渡带在腐殖质A层出现氮素累积峰。土壤碳氮比介于7~25之间,相对较低,利于土壤腐殖质化和有机氮矿化。碳氮比随海拔升高而升高,在土壤剖面中的分布随植被类型不同而有所差异。土壤中的氮素主要以有机氮的形式存在于土壤有机质中,土壤碳氮比与有机质含量显著相关。

关键词: 贡嘎山, 垂直带, 有机质, 氮素

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