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红壤水分扩散率和入渗性能的研究
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摘要:
研究了鄂东南5种母质发育的红壤水分扩散率和入渗性能,结果表明:土壤水分扩散率随土壤含水量的变化而变化,在含水量较高的情况下,表土层的土壤水分扩散率高于心土层和底土层;在低含水量的情况下,表土层的土壤水分扩散率低于心土层和底土层,影响土壤水分扩散率的主要因素是土壤容重。供试土壤水分稳定入渗速率均是表土层大于心土层和底土层,不同母质发育的土壤表土层以石英砂岩和花岗岩发育的红壤稳定入渗速率较大。,n=17),这是由于混状土柱的土壤水分扩散率主要受土壤总孔隙度的影响,容重小,总孔隙度大,土壤水分扩散率大。
关键词:  红壤 水分扩散率 入渗速率
DOI:
基金项目:
Study on the Hydraulic Diffusivety and Infiltration of Red Soil in the Southeast of Hubei Province
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Abstract:
The hydraulic diffusivity and infiltration of red soil derived from 5 parent materials in the southeast of Hubei province were studied. The resrlts show that :1.When the soil water content is high , the hydraulic diffusivity of surface soil is higher than those of subsoil and bottomsoil;when the soil water content is low ,the hydraulic diffusivity of surfacc soil is lower than those of subsoil and bottom soil , with the increase of soil bulk density and organic matter content of soil ,the diffusivity of soil decreases. 2.The steady-state infiltration rate of surface soil of the test soils is high ,but that of subsoil of the red soil derived from quaternary red clay ,argillaceous shale and granite is rery low , so that the steady- state infiltration rate of the whole soil body of these soils is low as well ,and that of subsoil in the red soil derived from guartzy sandstone is high , so that the infiltration rate of the whole soil body of this soil is high as well.With the increase of air- filled porosity , the steady- state i n filtration rate of soil increases.
Key words:  Red soil,Tydraulic deffusivity,Steady-state infiltration rate,

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