南方水蚀区不同侵蚀程度土壤粒径分形研究  

Study on the Fractal Dimension of Soil Particle Size Distribution in Areas with Different Water-Erosion Degrees in Southern China

作　　者：陈子玉[1] 顾祝军[1] 

机构地区：[1]南京晓庄学院生物化工与环境工程学院,南京211171

出　　处：《水土保持研究》2013年第4期13-16,23,共5页Research of Soil and Water Conservation

基　　金：国家自然科学基金(41071281)

摘　　要：土壤粒径分布是土壤和环境要素综合作用的结果,因而可藉以指示环境要素的某种性状。对南方水蚀区不同侵蚀程度下土壤粒径的分布特征进行研究,计算土壤粒径分布分形维数值,并分析其与土壤质地和土壤侵蚀程度的关系。结果表明,研究区土壤质地主要为砾石土,其2mm以下的体积分形维数和重量分形维数分别介于2.52~2.99和2.48~2.73之间,粒径重量累积百分比在2mm处产生显著变化,粒径域的重量分形维数在2mm以上和2mm以下分别为1.79~2.81和2.52~2.79。2mm以上粒径域的重量分形维数与土壤质地和土壤侵蚀程度呈显著的相关性。土壤质地越细,或土壤侵蚀越轻微,2mm以上粒径域的重量分形维数越大,反之亦然。故土壤2mm以上粒径域的重量分形维数可综合表征研究区土壤质地和土壤侵蚀程度。Soil particle size distribution is the result of interactions between soils and their environmental factors,so it can reflect certain properties of environmental factors.Aimed at analyzing the characteristics of particle size distribution of the soil under different water-erosion degrees in southern China,the fractal dimension of the soil particle size distribution was calculted,and the relationships between the fractal dimension values and soil textures or soil erosion degrees was explored.The results showed that,the gravelly soil dominated the soil textures in the study area.The volume and weight fractal dimension values of the soil particles less than 2mm were between 2.52to 2.99and 2.48to 2.73,respectively.The accumulated percentage of weight changed significantly at the soil particle size of 2mm,and the weight fractal dimension values were 1.79~2.81and 2.52~2.79for the soil particle size greater than 2mm and lower than 2mm,respectively.The weight fractal dimension values for the soil particle size greater than 2mm were significantly related to both soil textures and soil erosion degrees.The finer the soil texture or the less severely the soil eroded,the greater the weight fractal dimension for the soil particle size which is greater than 2mm,and vice versa.Therefore,the weight fractal dimension for the soil particle greater than 2mm can indicate the soil texture and soil erosion degree in the study area.

关 键 词：南方水蚀区 土壤粒径分布 分形 土壤侵蚀 

分 类 号：S152.3[农业科学—土壤学]