Spatial variability of soil salinity,organic matter and pH value around the area at the mouth of reservoir dam on arid plain was analyzed by using the method of geostatistics.Results showed that total salt content is higher than the standard value by more than 0.3%,and decreases gradually from the surface to the bottom.Soil organic matter has a strong spatial correlation,variation is mainly caused by regional factors.Total salt and soil pH values showed moderate spatial correlation which is determined by th...