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1 2016

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Characterization of Soil Particle Size Distribution with a Fractal Model in the Desertified Regions of Northern China

Gao G.-L., Ding G.-D., Zhao Y.-Y., Wu B., Zhang Y.-Q., Guo J.-B., Qin S.-G., Bao Y.-F., Yu M.-H., Liu Y.-D.

Acta Geophysica

2016

Vol. 64, no. 1

1--14

We constructed an aeolian soil database across arid, semi-arid, and dry sub-humid regions, China. Soil particle size distribution was measured with a laser diffraction technique, and fractal dimensions were calculated. The results showed that: (i) the predominant soil particle size distributed in fine and medium sand classifications, and fractal dimensions covered a wide range from 2.0810 to 2.6351; (ii) through logarithmic transformations, fractal dimensions were significantly positive correlated with clay and silt contents (R2 = 0.81 and 0.59, P < 0.01), and significantly negative correlated with sand content (R2 = 0.50, P < 0.01); (3) hierarchical cluster analysis divided the plots into three types which were similar to sand dune types indicating desertification degree. In a large spatial scale, fractal dimensions are still sensitive to wind-induced desertification. Therefore, we highly recommend that fractal dimension be used as a reliable and quantitative parameter to monitor soil environment changes in desertified regions. This improved information provides a firm basis for better understanding of desertification processes.