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以典型干旱区新疆于田县绿洲为研究区,利用相关分析和非线性回归分析方法,研究了不同季节和深度的土壤湿度时空变化的影响因素。研究结果表明,对于研究区表层1m深度土壤,各个土层的土壤湿度存在着显著且强烈的相关关系,不同深度土层的土壤湿度空间变异程度不同,表层土壤湿度的空间变异程度较大。地下水位和土壤蒸散发量是研究区土壤湿度时空变化的主要控制因素,不同季节,地下水位和土壤蒸散发量对不同深度土壤湿度空间变化的影响力和影响深度不同,春季和夏季,都是地下水位大于土壤蒸散发量的影响力,土壤蒸散发量的影响深度在春季达到60-80cm,在夏季达到100cm。海拔高度和土壤温度对土壤湿度的空间变异有微弱的影响。在对土壤湿度时空变化具有显著影响的因素中,除土壤温度外,其它因素对土壤湿度时空变化的影响呈非线性关系。
Taking the typical oasis in Yutian County, Xinjiang as a study area, the correlation analysis and nonlinear regression analysis were used to study the influencing factors of spatial and temporal variations of soil moisture in different seasons and depths. The results show that there is a significant and strong correlation between the soil moisture of each soil layer and the soil depth at 1m depth in the study area. The spatial variability of soil moisture in different depth soil layers is different, and the spatial variability of surface soil moisture is larger. Groundwater level and soil evapotranspiration are the main controlling factors of spatio-temporal change of soil moisture in the study area. In different seasons, the influence and influence depth of groundwater level and soil evapotranspiration on spatial variability of soil moisture at different depths are different in spring and summer The groundwater level is greater than the impact of soil evapotranspiration. The depth of soil evapotranspiration reaches 60-80 cm in spring and 100 cm in summer. Altitude and soil temperature have a weak influence on the spatial variability of soil moisture. Among the factors that have a significant effect on the spatio-temporal changes of soil moisture, the factors other than the soil temperature have a nonlinear relationship with the temporal and spatial variations of soil moisture.