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.