The Spatial Variability of Soil Moisture in Orchard in Yantai

The soil water contents within 0～100cm in orchard were determined with Trime soil water system,and then the data statistic, semivariance, and fractal characteristics were analyzed.The results showed that the variability coefficient of soil moisture content of each layer was in the middle intensity and the variance of soil water became weaker with increasing of soil depth.The spatial correlation range in bottom soil was larger than that in surface soil.The fractal dimension was relation to the range.The range became larger when the fractal dimension was smaller.The change of spatial isoline distribution of soil water was from denseness to sparseness with increasing of soil depth.The isograms in surface soil had the obvious high regions and low regions, and the regions were small.The distribution fragmenting of soil moisture content was very serious.The change range in middle soil was larger than that in surface soil and the distribution fragmenting of soil moisture content was weaker.The change in bottom soil was not obvious in large region and has a better coherence.