Abstract:

 A small watershed in Zhongxian county，Chongqing，was chosen to study the soil nutrient content distribution in sloping field of different planting modes.The results show that the differences of soil nutrient content between diverse planting modes are remarkable.The difference of soil nutrient content between woodland and dryland is not significant.However，the soil nitrogen and organic matters of woodland and dryland are significantly lower than that of paddy land.Soil phosphorus is significantly higher than that of paddy land.Along the top of the slope to base of the slope in the watershed，the soil nutrients show different disciplines.Soil organic matter totally increased with a relatively slower decrease after the increase.Soil nitrogen is showing an trend of gradual increase.Whereas，soil phosphorus is totally decreasing with a relatively slower increase after the decrease.Compared with the research results of watershed in other areas，the soil nitrogen and phosphorus level of this watershed are relatively lower than that of other watersheds such as Taihu lake area，Dianchi lake area and Dongting lake area.〖