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塿土土壤水力特性空間變異的多重分形分析
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國家自然科學(xué)基金資助項(xiàng)目(50709028);國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)資助項(xiàng)目(2010AA10A302);西北農(nóng)林科技大學(xué)基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(QN2009087)


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

    為探討塿土土壤水力特性的空間分布特征,對楊凌示范區(qū)大寨鄉(xiāng)小麥與玉米輪作地進(jìn)行直線分布土壤取樣,室內(nèi)測定了土壤水分特征曲線、飽和導(dǎo)水率、土壤含水率、容重等土壤水力特性,用Brooks—Corey模型對土壤水分特征曲線進(jìn)行擬合,采用多重分形方法對Brooks—Corey模型參數(shù)(θs、α、n)、飽和導(dǎo)水率(Ks)、土壤含水率(θ)、容重(ρ)等進(jìn)行空間變異性分析。結(jié)果表明:在全部采樣方向上Ks、α及n的變異性較強(qiáng),θs、θ及ρ表現(xiàn)為弱變異;不同采樣方向上土壤水力特性參數(shù)具有多重分形特征;不同采樣方向上θs、θ及ρ的多重分形結(jié)構(gòu)較弱,空間變異性不強(qiáng);不同采樣方向上Ks、α及n的多重分形結(jié)構(gòu)明顯,廣義分形維數(shù)分別為0.7~1.9、0.6~1.2、0.9~1.1,空間變異性較強(qiáng),且Ks比α和n具有更為復(fù)雜的空間分布結(jié)構(gòu)。

    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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郭麗俊,李毅,李敏,任鑫,劉春成,朱德蘭.塿土土壤水力特性空間變異的多重分形分析[J].農(nóng)業(yè)機(jī)械學(xué)報,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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