中文摘要：

在果树生长旺期，利用Trime水分速测系统对果园表层土壤水分采样后，对土壤水分的数据统计特征、变异函数、分形特征、合理取样数目及其等值线分布进行了分析。结果表明：降雨后变程和基台值最大，变异系数和分维数最小，其值分别为38．09m、1．163、0．0888和1．846。在90％或95％的置信水平（P1）和相同精度（△）下，降雨后土壤水分合理取样数目最少，此时土壤水分的空间等值线分布的变化程度相对也较小。这说明降雨有促使土壤水分分布趋于均匀及空间相关性增强的效应，但也可能导致在个别区域内出现明显的高低值；而随后的土壤蒸发则使土壤水分的结构性减弱，空间异质性增强。

英文摘要：

In the bloom growth stage of fruit trees surface soil water of orchard was sampled with Trime soil water system and then ,data statistic, variogram, and fractal characteristic were analyzed. The results showed that ranges and sills were maximal, and the coefficients of variations and fractal dimensions were minimal after rainfall. Under P1 of 90% or 95% and same precision, the reasonable sampling numbers was minimal after rainfall, and at the same time the change extent of spatial isoline distribution of soil water was also relatively small. The findings showed that rainfall resulted in more even distribution of soil water, and more significant spatial correlation.