辽河干流上游流域土地利用对土壤颗粒分形维数影响

分析了辽河干流典型风沙区林地、草地和农田土壤颗粒的分形维数空间分布特征。结果表明：土壤颗粒分形维数总体表现为农田高于林地和草地，且在农田土壤30~50 cm深度时达到最大值（2.58），在草地土壤0~10 cm出现最小值（2.26）；在林地土壤中随深度增加而减小，在草地和农田土壤中随深度增加而增加。土壤分形维数均与粉粒含量极显著正相关（P<0.01）。农田更有利于土壤细小颗粒的形成，改良土壤质地，土壤结构相对较好，其次是林地，草地相对较差。

Effects of Land Use on Fractal Dimension of Soil Particles in the Upper Reaches of the Liaohe River Watershed

We analyzed the spatial distribution characteristics of fractal dimension of soil particles in woodland, grassland and farmland that in the typical sandy area of the Liaohe River Basin. The results show:As a whole, the fractal dimension of farmland was higher than that of woodland and grassland, and reached the maximum value(2.58) at the depth of 30-50 cm in the farmland soil, and reached the minimum value (2.26) at the depth of 0-10 cm in the grassland soil; the fractal dimension decreased as the depth increases in woodland soil, and increased as the depth increases in grassland and farmland soil. The fractal dimension of soil was significantly positively correlated with silt content(P<0.01). Farmland is more conducive to form the small soil particles, improve soil texture, whose soil structure is relatively good, followed by woodland, grassland is relatively poor.