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Abstract
Spatial variability of soil moisture (wetness) was examined on sloping fields in the shallow hilly regions of Sichuan Basin, southwestern China. The experimental site, a large hillside field with a slope of approximately 10° has an area of 80 m (transverse) 2 30 m (longitudinal). It was plotted by 'grid pattern' of 5 m 2 5 m, setting up 119 sampling points. Semi-variance analysis for soil wetness was conducted in the transverse and longitudinal directions respectively. The results showed that the semivariance functions for the two are completely different from each other. Semivariance values have an obvious structure in the transverse direction, displaying the correlation range of soil wetness of 30 m. No spatial correlation, however, appears in the longitudinal direction in designed minimum distance (5 m) of sampling.