COMPARISON OF SOIL MOISTURE CHARACTERISTIC CURVES IN SALINE-ALKALI LAND UNDER DIFFERENT FARMLAND SHELTERBELTS

In order to clarify the influence of forestation on soil moisture characteristics of saline-alkali land, the direct contact filter paper method was used to analyse the soil moisture characteristic curve, soil physical properties and their correlation after forestation in different faunland saline-alkali land. In this study, Van Genuchten model was used to calculate the slope of soil characteristic water curve fitted by Van Gardner model, and the fitting effect of Van Genuchten model on measured data was analysed. By analysing the influencing factors of the model parameters and analysing the influencing mechanism of different influencing factors on the parameters, the main factors were determined. On this basis, the soil moisture characteristic curve with higher accuracy was realized. The results showed that the soil water holding capacity was analysed according to the obtained parameters, the soil moisture characteristics of different farmland shelterbelt were analysed, and the equation of soil moisture characteristic curve suitable for the farmland shelterbelt in this region was discussed, which provided theoretical guidance for water storage and soil conservation of farmland shelterbelt in alkali land, and had important significance for the research and development of farmland shelterbelt engineering management model.