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利用地统计学方法及ArcGIS中的Kriging空间插值法对瓜州绿洲胡杨林下土壤含水量的空间变化规律进行了研究。结果表明:在垂直方向上,QZ、SG和BL三个样地的土壤含水量随深度的增加而增加,TG样地,由于土壤板结,导致其含水量随深度的增加呈减少趋势。瓜州绿洲胡杨生长阶段与其林下土壤含水量呈负相关关系,且土壤含水量越向下层变化程度越小。其中,QZ样地的各层土壤含水量变化程度均小于其它三个样地,QZ样地为天然胡杨林,其余三块样地均受到21世纪初移民开垦、灌溉等活动的影响,天然胡杨林演变成为受人类活动影响的林木。空间上,四个样地各层土壤含水量变化呈现出一致性,各土层含水量在空间上都呈条带状格局,且从东南向西北呈逐渐递减的趋势。
The spatial variability of soil water content under Populus euphratica forest in Guazhou oasis was studied by geostatistics and Kriging interpolation in ArcGIS. The results showed that in the vertical direction, the soil water content of QZ, SG and BL increased with the increase of soil depth. The soil moisture content of TG plot decreased with the increase of soil depth. The growth stage of Populus euphratica in Guazhou oasis is negatively correlated with the soil moisture content under the forest, and the smaller the soil moisture content changes to the lower layer. Among them, the change of soil water content in each layer of QZ plot was less than that in the other three plots, QZ plot was natural Populus euphratica forest, and the other three plots were affected by the reclamation and irrigation activities in the early 21st century. Become a forest affected by human activities. Spatially, the changes of soil water content in all the four plots show a consistency. The water content of each soil layer is in a stripe pattern in space and gradually decreases from southeast to northwest.