岷江上游河谷土壤粒径分形维数及其影响因素  

FRACTAL DIMENSIONS OF SOIL PARTICLES AND RELATED AFFECTING FACTORS FROM THE VALLEY OF UPPER MINJIANG RIVER

作　　者：文星跃[1,2] 黄成敏[1] 黄凤琴[1] 黄艳娟[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]绵阳师范学院资源环境工程学院,四川绵阳621000

出　　处：《华南师范大学学报（自然科学版）》2011年第1期80-86,共7页Journal of South China Normal University(Natural Science Edition)

基　　金：教育部新世纪优秀人才支持计划项目(NCET-08-0379);高等学校学科创新引智计划项目(B08037)

摘　　要：运用土壤体积粒径分维模型计算了岷江上游河谷土壤粒径分形维数,分析了分形维数的空间变化特点及其与粒度组成、粒度参数和铁游离度等之间的关系.土壤粒径分形维数空间分布与气候、植被环境有关.分形维数可以反映粒径大小.分形维数与粒度标准偏差和峰度不存在相关性,样品粒度特征主要受原位母质风化影响.铁游离度(Fed/Fet)与分形维数呈明显正相关关系.结果表明粒径分形维数可以用来比较土壤成壤强度及发育环境.The fractal dimensions of particle-size（Ds） for 25 surface soil samples collected from the valley of upper Minjiang River had been calculated by the equation of volume fractal dimension.The spatial distribution of these Ds values as well as the correlations between Ds and volumetric contents of particle size,grain size parameters,and the Fed/Fet were analyzed,respectively.The spatial distribution of Ds was related to the climate and vegetation.Ds could be a proxy of the particle-size distribution.There was no correlation between Ds and standard deviation or kurtosis value,which indicated that the soil particle-size distribution had been controlled by in-site weathering of parent materials.A significant positive correlation occurred between Ds and Fed/Fet,reflecting that the fractal dimension might be used as an indicator for the degree of soil development.

关 键 词：土壤粒径 分形维数 粒度参数 铁游离度 岷江上游 

分 类 号：S152.32[农业科学—土壤学]