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利用Trime水分速测系统于5月2日、5月13日、5月25日分三次对果园0～100cm土壤水分分层采样后,对土壤水分的数据统计特征、变异函数、分形特征、及其等值线分布进行了分析。结果表明:0～30cm、30～60cm、60～100cm的变异系数值均在0.2023～0.4374范围内,属于中等变异性,且随着深度的增加,变异程度逐渐减弱。底层的自相关范围要大于表层,分维数D与变程A0存在一定的联系性,当分维数D减小时,A0随之增大。随着土层深度的增加,等值线的疏密程度由密变疏,逐渐趋于平缓。表层含水量的等值线图具有明显的高低值区,且高值和低值的区域范围较小,图形破碎化程度严重。中间层的区域变化范围扩大,破碎化程度相对减弱。底层区域的含水量在较大范围内变化并不明显,具有较好的一致性。
Trime moisture measurement system was used to sample soil water at 0 ~ 100cm in orchard on three occasions on May 2, May 13 and May 25 to analyze the statistical characteristics of soil moisture, variogram, fractal features and Its contour distribution was analyzed. The results showed that the coefficients of variation of 0 ~ 30cm, 30 ~ 60cm and 60 ~ 100cm ranged from 0.2023 to 0.4374, which belonged to moderate variability. With the depth increasing, the degree of variation gradually weakened. The autocorrelation range of the bottom layer is larger than that of the surface layer. There is a certain relationship between the fractal dimension D and the variation A0. When the fractal dimension D decreases, A0 increases. With the increase of soil depth, the density of the contour lines changes from dense to dense, and gradually tends to be gentle. The contours of the surface water content have obvious high and low value areas, and the area of high and low value area is small, the degree of graphic fragmentation is serious. The area of the middle layer is widening and the degree of fragmentation is relatively weak. The water content in the bottom area does not change obviously in a wide range and has good consistency.