Effects of Salinity on Soil Water Characteristic Curve

To study the effects of salinity on soil water characteristic curve,centrifugation method was used to measure soil water characteristic curves of salty soils,such as NaCl,KCl,CaCl2,MgCl2,MgSO4,whose soil salt contents were all 0%,0.1%,0.3%,0.5%,0.3%and 1%,respectively.Results showed that salinity could make soil water characteristic curve shift to the right and improve soil water holding capacity.With the increase of soil salinity,the shifting of soil water characteristic curve and the water holding capacity decreased.The effects of salt types on soil water characteristic curve were not obvious,the differences between the solutes were small.There were high correlations between the parameters of VG model and soil salt content.The modified VG model could well predict soil water characteristic curve of salty soil.