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在一个８０ｍ（横坡）×３０ｍ（顺坡）的坡度为１０°的坡地上，按５ｍ×５ｍ设置１１９个采样点，测定土壤湿度，并对其结果进行空间变异性分析。结果表明，观测地的土壤湿度分布在纵、横各方向上的变异规律显著不同，顺坡方向未表现出明显的空间变异规律，而横坡方向呈现明显的空间变异结构。其相关域约为３０ｍ。
119 sampling points of 5m × 5m were set up on a slope of 10 ° in a slope of 80m (horizontal slope) × 30m (slope), soil moisture was measured and the spatial variability was analyzed. The results showed that the variation of soil moisture distribution in the observation area was significantly different in the vertical and horizontal directions, the spatial variation pattern was not shown in the slope direction, and the obvious spatial variation structure was observed in the transverse slope. Its related domain is about 30m.