农业机械学报2011，Vol.42Issue(9)：50-58,9.
塿土土壤水力特性空间变异的多重分形分析
Multifractal Study on Spatial Variability of Soil Hydraulic Properties of Lou Soil
摘要
Abstract
In order to discuss spatial distribution characteristics of soil hydraulic properties of Lou soil, samples were taken along lines in the area of wheat and maize crop rotation in Dazhai village, Yangling, Shaanxi. Soil water characteristic curves, saturated hydraulic conductivity, soil water content and soil bulk density were measured. Brooks - Corey models were used to describe soil water characteristic curves, and the spatial variation of Brooks - Corey model parameters ( θ,, a and n) , saturated hydraulic conductivity (Kt) , soil water content (θ) and soil bulk density (p) were analyzed with multifractal method. Results indicated that Ks, a and n had stronger variability, θ,, θ and p showed weak variability in the entire sampling directions; the soil hydraulic properties showed multifractal features at different sampling directions; the multifractal structures of θs,θ and p were weak at different sampling directions which indicated weak spatial variability. Kt, a and n had obvious multifractal structures at different sampling directions. Their generalized dimensions ranged from 0. 7 to 1.9, from 0. 6 to 1.2 and from 0. 9 to 1.1, respectively, spatial variability were strong, and the spatial distribution structure of Ks was more complex than a and n.关键词
土壤水力特性/空间变异/多重分形Key words
Soil hydraulic properties/ Spatial variability/ Multifractal分类
农业科技引用本文复制引用
郭丽俊,李毅,李敏,任鑫,刘春成,朱德兰..塿土土壤水力特性空间变异的多重分形分析[J].农业机械学报,2011,42(9):50-58,9.基金项目
国家自然科学基金资助项目(50709028)、国家高技术研究发展计划(863计划)资助项目(2010AA10A302)和西北农林科技大学基本科研业务费专项资金资助项目(QN2009087) （50709028）
