Fractal features of soil particle size distribution in newly formed wetlands in the Yellow River Delta

The characteristic of particle size distribution (PSD) in the newly formed wetlands in coast has seldom been studied. We applied fractal-scaling theory in assessing soil particle size distribution (PSD) features of newly formed wetlands in the Yellow River Delta (YRD), China. The singular fractal dimensions (D) values ranged from 1.82 to 1.90, the capacity dimension (D-0) values ranged from 0.84 to 0.93, and the entropy dimension (D-1) values ranged from 0.66 to 0.84. Constrained corresponding analysis revealed that 43.5% of the variance in soil PSD can be explained by environmental factors, including 14.7% by seasonal variation, 8.6% by soil depth, and 8.0% by vegetation type. The fractal dimensions D and D-1 were sensitive with fine particles with size ranging less than 126 mu m, and D-0 was sensitive with coarse particles with size ranging between 126 mu m to 2000 mu m. Fractal analysis makes full use of soil PSD information, and offers a useful approach to quantify and assess the soil physical attributes in the newly formed wetland.