黄土丘陵区土壤粒径分布单重分形和多重分形特征

Monofractal and Multifractal Analysis on Soil Particle Distribution in Hilly and Gully Areas of the Loess Plateau

利用单重分形和多重分形方法定量分析黄土丘陵区土壤粒径分布(PSD)特征,同时分析土地利用方式对PSD分形参数的影响。结果表明:研究区PSD呈现出非均匀分布,具有多重分形特征,PSD多重分形谱f(α)-α为不对称的上凸曲线。容量维数D0与土壤质地相关性不明显,信息维数D1、关联维数D2和多重分形谱宽Δα均与粘粒体积分数呈极显著正相关(P<0.01)。土地利用方式对粘粒、粉粒、砂粒体积分数和Dsilt值有显著影响(P<0.01)。多重分形分析为详细描述PSD提供了精确的方法和途径。

Monofractal and multifractal analysis were combined to quantitatively investigate soil particle size distribution（PSD） in hilly and gully areas of the Loess Plateau,and the effect of land uses on PSD parameters was analyzed.The results indicated that the PSD showed heterogeneous distribution,had multifractal feature,and multifractal spectrum functions f（α）-α were asymmetrical convex curve.There was no significant relationship between capacity dimension（D0） and soil particle contents.Clay contents were positively correlated with the entropy dimension（D1）,correlation dimension（D2） and the width of multifractal spectra Δα（P0.01）.The clay contents,silt contents,sand contents and dimension of silt domain（Dsilt） values were significantly influenced by land uses（P0.01）.The multifractal analysis provided an accurate method to characterize the PSD.