黑土区农田土壤含水量空间变异性的尺度效应研究

发布时间：2018-02-04 16:52

本文关键词： 黑土区土壤含水量空间变异性尺度效应　出处：《水利学报》2017年05期 　论文类型：期刊论文

【摘要】：为研究黑土区农田土壤含水量空间变异性的尺度效应,测定32 m×32 m、48 m×48 m、64 m×64 m、80 m×80 m和96 m×96 m 5种采样面积上的土壤含水量,运用传统统计学、地统计学和多重分形等理论,分析土壤含水量空间变异性随采样面积的变化规律。结果表明:研究区不同采样面积土壤含水量的平均值介于31.13%~33.57%,均存在由小于采样尺度和实验误差导致的变异,空间相关范围介于25.80 m~123.60 m,空间相关程度介于16.742%~29.874%,空间变异程度介于0.0292~0.1026;随采样面积的增加,土壤含水量的平均含量和变异程度都逐渐减小,由小于采样尺度和实验误差导致的变异与空间相关范围都先降低后增加,空间相关程度先增加后降低,造成不同采样面积土壤含水量空间变异性的局部信息有所差异。
[Abstract]:In order to study the scale effect of spatial variability of farmland soil water content in black soil area, the spatial variability of soil water content in black soil area was determined by measuring the spatial variability of soil water content in 32 m 脳 32 m 脳 48 m 脳 48 m 脳 64 m. The soil water content on the sampling area of 80m 脳 80m and 96m 脳 96m was studied by traditional statistics, geostatistics and multifractal. The variation of spatial variability of soil water content with sampling area was analyzed. The results showed that the average value of soil water content of different sampling area was 31.13% or 33.57%. The range of spatial correlation is between 25.80 m and 123.60 m, and the degree of spatial correlation is between 16.7422% and 29.874%. The degree of spatial variation was between 0.0292 and 0.1026; With the increase of sampling area, the average content and variation degree of soil water content decreased gradually, and the variation caused by less than sampling scale and experimental error decreased first and then increased. The degree of spatial correlation increased first and then decreased, which resulted in the difference of local information of spatial variability of soil moisture content in different sampling areas.
【作者单位】：黑龙江大学水利电力学院;东北农业大学水利与土木工程学院;
【基金】：国家自然科学基金项目(51409046,51279031)
【分类号】：S152.7
【正文快照】： 1研究背景土壤水是土壤的一个重要组成部分,是构成土壤肥力的一个重要因素。受各种自然因素和人为因素的影响,土壤具有明显的空间变异性[1-3],土壤水分作为土壤的一个重要性质,必然具有空间变异性。目前国内外学者对土壤水分的空间变异性进行了大量研究[4-8],也取得了很多成果

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