塿土土壤水力特性空间变异的多重分形分析
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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);西北农林科技大学基本科研业务费专项资金资助项目(QN2009087)


Multifractal Study on Spatial Variability of Soil Hydraulic Properties of Lou Soil
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    摘要:

    为探讨塿土土壤水力特性的空间分布特征,对杨凌示范区大寨乡小麦与玉米轮作地进行直线分布土壤取样,室内测定了土壤水分特征曲线、饱和导水率、土壤含水率、容重等土壤水力特性,用Brooks—Corey模型对土壤水分特征曲线进行拟合,采用多重分形方法对Brooks—Corey模型参数(θs、α、n)、饱和导水率(Ks)、土壤含水率(θ)、容重(ρ)等进行空间变异性分析。结果表明:在全部采样方向上Ks、α及n的变异性较强,θs、θ及ρ表现为弱变异;不同采样方向上土壤水力特性参数具有多重分形特征;不同采样方向上θs、θ及ρ的多重分形结构较弱,空间变异性不强;不同采样方向上Ks、α及n的多重分形结构明显,广义分形维数分别为0.7~1.9、0.6~1.2、0.9~1.1,空间变异性较强,且Ks比α和n具有更为复杂的空间分布结构。

    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 (θs, α and n ), saturated hydraulic conductivity (Ks), soil water content (θ) and soil bulk density (ρ) were analyzed with multifractal method. Results indicated that Ks,α and n had stronger variability,θs, θandρshowed weak variability in the entire sampling directions; the soil hydraulic properties showed multifractal features at different sampling directions; the multifractal structures ofθs, θ and ρwere weak at different sampling directions which indicated weak spatial variability.Ks,α 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 αand n. 

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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. Guo Lijun, Li Yi, Li Min, Ren Xin, Liu Chuncheng, Zhu Delan. Multifractal Study on Spatial Variability of Soil Hydraulic Properties of Lou Soil[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(9):50-58.

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