Analysis on soil physico-chemical properties of fluctuation zone of Three Gorges reservoir area in Yunyang

In order to investigate the distribution of soil physico-chemical properties of fluctuation zone of Three Gorges reservoir area, several soil physico-chemical properties were performed under different elevation group in Yun Yang. The result showed that pH value of the sampling soil was 5-6, so the soil was weakly acidic, called acid purple soil. Oxiclation-reduction potential (ORP) of the sampling soil was below 200 mV, and the soil was not conducive to the growth of plants. Electrical conductivity of sampling soil was 0.2-0.5 ms/cm. Electrical conductivity and moisture content reduced gradually with the elevation increasing. The content of organic matter of surface soil was 29.92 -111.77 g/kg and the average was 79.40g/kg. The content of total phosphorus (TP) of surface soil was 0.2985-0.6623 g/kg and the average was 0.4782 g/kg. The content of organic matter and TP increased gradually with the increase of elevation. The content of total nitrogeh (TN) of surface soil was 0.0540%-0.1605%, and the average was 0.010%. The content of TN decreased gradually with the increase of elevation.