Soil Moisture of Artificial Vegetation in Mixed Area with Water and Wind Erosion of Loess Plateau

The soil moisture and water potential of artificial vegetation in the mixed area with water and wind erosion of the Loess Plateau has being measured by the stove method using WP4 Dewpoint Potential Meter.The research analyzed the characters of spatial and temporal distribution and dynamic change of soil moisture from both volume and energy side,calculated the soil water retention curve of different species trees based on real data.The results would provide the necessary theoretical reference for the vegetation construction and ecological water requirement.The result indicated that,with the depth increasing,the soil moisture decreased to stabilization in 0-300 cm soil layer.Soil moisture markedly changed in 0-30 cm soil layers,but soil moisture gradually decreased to stabilization at the 3.00%~5.00% below 30 cm soil layer.Soil moisture was significantly affected by the precipitation and its distribution,and in the observation period soil water reserved 26.7 mm.Soil water potential and soil moisture changed consistently,all correlation coefficients were over 0.95,and the results of soil water retention curve fitting were better.In the high-flow year,rainfall supplied moisture to the soil of shallow layer,but the soil of deep layer was seriously short of moisture.There were dried earth layers in the deep soil layer.It is of great significance to pay more attention to the soil moisture in the special rainfall years.