Multifractal study on spatial variability of soil water and salt and its scale effect

In order to reveal spatial distribution characteristics of soil water and electrical conductivity in woodland in studied area and their scale effects, the paper studied spatial variability of soil water and electrical conductivity under different sampling time and area in woodland in Yangling with multifractal method. The results showed that spatial heterogeneity of soil water and electrical conductivity under three kinds of sampling area decreased with the increase of average water content and electrical conductivity. As sampling area increased, when average water content and electrical conductivity were high, spatial heterogeneity of soil water became large, and scale effect of soil electrical conductivity was not obvious; when average water content and electrical conductivity were low, their spatial distribution had obvious patch structure. Multifractal spectrums of soil water and electrical conductivity were different under sampling time and area, which indicated that their spatial heterogeneity were caused by different information. Multifractal analysis could reveal more local information of soil water and electrical conductivity in sampling woodland.