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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (18): 121-124.

• 农学 农业基础科学 • 上一篇    下一篇

不同利用方式下土壤溶解性有机碳含量研究

卫东 戴万宏 汤佳   

  • 收稿日期:2011-02-25 修回日期:2011-04-28 出版日期:2011-07-25 发布日期:2011-07-25

Study of Soils Dissolved Organic Carbon in Different Landuse

  • Received:2011-02-25 Revised:2011-04-28 Online:2011-07-25 Published:2011-07-25

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摘要：

溶解性有机碳含量在土壤有机质中所占的比例很小，但却是土壤有机质中最为重要和活跃的部分。分别选取安徽省芜湖市区附近4种土地利用方式下（农田、菜地、林地、荒地）的土壤为研究对象，研究了不同利用方式下土壤溶解性有机碳含量及其剖面分布规律，为了解溶解性有机碳在土壤生态系统碳循环中的作用，探讨土壤溶解性有机碳与土壤肥力及培肥措施的关系提供理论依据。结果表明：土壤溶解性有机碳含量在土壤表层最高，随着土层深度增加有明显减小的趋势。土地利用方式对土壤溶解性有机碳含量有明显影响，4种土地利用方式下土壤的溶解性有机碳含量有很大差异，大小顺序为农田>林地>菜地>荒地。这说明了土壤溶解性有机碳含量与土壤肥力有关，可以作为评价土壤肥力的生物学指标。

关键词: 黔西北山区, 黔西北山区

Abstract:

Although dissolved organic carbon (DOC) in soil have little proportion in the soil organic matter, it is the most important and active parts of soil organic matter. In order to study the soil DOC content and its profile distributions in different landuse, four soils with different landuse near the city of Wuhu, Anhui province, which include the farmland, vegetable plot ,forest land and pen land, were selected and studied in this paper. the results can be provided a theoretical basis for understanding the role of DOC in soil carbon cycling in ecosystems and the relationship between DOC and soil fertility and fertilization. The results were as follows: (1) The concentration of dissolved organic carbon was the highest in the surface of the soil. The deeper the depth of soil, the higher the concentration was. (2) A positive correlation was found between the DOC concentrations in soil used in different ways and the soil fertility. The concentration of DOC in a way of soil use was significantly different from another. The series were that: farmland > forest > vegetable > pen land. These results indicated that the concentration of DOC had positive correlation with the soil fertility and could be used as a biological index in soil fertility.