科尔沁沙地丘间低地－流动沙丘联合体土壤含水量的空间异质性

摘要

We studied the spatial and temporal variation of soil water content by semi-variance analysis , one-way ANOVA and Duncan multiple comparisons .The seasonal dynamic of soil water content was consistent with the rainfall , and both of them were highest on June .The soil water content decreased from the ecotones to the interdune lowlands , to the active sand dunes .Both the soil water content on the active sand dunes and ecotones were increased with the increasing of soil depth , whereas , it was decreased with the increasing of soil depth on the interdune lowlands .The spatial autocorrelation of soil wa-ter content on the active sand dune was 90%at fine scale , however , the autocorrelation on the ectone was strong at coarser scale.The spatial autocorrelation on the upper soil layer of interdune lowlands was moderate at the coarser scale.%运用半方差分析、单因素方差分析和Duncan多重比较方法，对科尔沁沙地丘间低地－流动沙丘联合体土壤含水量的时空变化进行了分析。结果表明：土壤含水量的季节动态与降水量的变化趋势保持一致，6月份降水量和土壤含水量最高。土壤含水量由高到低的趋势为：过渡带、丘间低地、流动沙丘。流动沙丘和过渡带的土壤含水量随着土壤深度的增加而增加，丘间低地的土壤含水量随着土壤深度的增加而降低。流动沙丘的土壤含水量在较小尺度上具有90％的空间自相关性，过渡带的土壤含水量在较大尺度上具有强烈的空间自相关性。丘间低地表层的土壤含水量在较大尺度上具有中等的空间自相关性。