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为了定量研究土地盐渍化时空变化影响因子的相对影响力大小,以典型干旱区中国新疆渭干河灌区为例,基于现阶段土地盐渍化研究成果,在8个不同的空间尺度下,分别选取了7个土地盐渍化时空变化影响因子,应用灰色关联方法分析了各个影响因子在土地盐渍化时空变化过程中的相对影响力大小。研究结果表明自然和人为因素共同作用于研究区土地盐渍化时空变化过程,而对土地覆盖/利用变化作用的人类活动在研究时间段内起主导作用,地下水埋深、地下水矿化度和气候因素在较小尺度上起主要作用,地形地貌、灌排系统、地表水资源在较大尺度上起主要作用。在每个空间尺度上各个影响因子的影响力相差不大,研究区土地盐渍化变化影响因素复杂,其治理等工作需要综合考虑各个因素的作用。
In order to quantitatively study the relative influence of influencing factors of temporal and spatial variation of salinization in soil, taking the typical Weigan River Irrigation District of Xinjiang Uygur Autonomous Region of China as an example, based on the research results of land salinization at present, under 8 different spatial scales, Seven factors influencing the salinization of land are selected, and the relative influence of each influencing factor in the spatial and temporal change of salinization is analyzed by the gray relational method. The results show that both natural and man-made factors play a role in the spatial and temporal change of land salinization in the study area, and human activities that play a role in land cover / utilization change play a leading role during the study period. Groundwater depth, groundwater salinity and climate Factors play a major role in smaller scales. Topography, irrigation and drainage systems and surface water resources play a major role on a larger scale. The influencing factors of each influencing factor are not different on each spatial scale. The influencing factors of land salinization change in the study area are complex, and their management and other work need to consider the effect of each factor.