[Gray correlation analysis of the impact of land use type on soil physical and chemical properties in the hilly area of central Sichuan, China.].

A case study was conducted in a small watershed of Sichuan hilly basin. In order to eva-luate the effect of land use type on soil characteristics, the soil physical and chemical properties of the 0-10 and 10-20 cm soil layers were analyzed through comparison between bare land and four land use types i.e.