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CaCl2溶液灌溉對(duì)土壤水鹽與斥水性分布的影響
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國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)資助項(xiàng)目(SS2013AA100900)和西北農(nóng)林科技大學(xué)基本科研業(yè)務(wù)費(fèi)優(yōu)秀青年基金資助項(xiàng)目(YQ2013006)


Effects of CaCl2 Solution Irrigation on Distributions of Soil Water, Salt and Water Repellency
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    摘要:

    選用砂土和鹽堿土并添加斥水劑,,采用0、1,、3和6 g/L的CaCl2溶液進(jìn)行室內(nèi)土柱入滲試驗(yàn),,對(duì)比灌水水質(zhì)對(duì)土壤水鹽及斥水性分布的影響,。結(jié)果表明:咸水灌溉后,,砂土1和親水鹽堿土的累積入滲量,、濕潤鋒和入滲率曲線均較光滑,;而砂土2和斥水鹽堿土的入滲特征曲線不如砂土1的光滑,入滲過程比前者慢得多,。灌水礦化度增加對(duì)鹽堿土的入滲過程影響更明顯,。Philip模型與Kostiakov公式擬合親水土壤入滲率過程都較好。砂土1和砂土2在咸水灌溉后剖面的滴水穿透時(shí)間都比初始值有所增加,,但最大增加值僅3.6 s。鹽堿土灌后剖面的滴水穿透時(shí)間增加明顯,,最大增加值為19 s,。灌水礦化度增加對(duì)電導(dǎo)率、Ca2+質(zhì)量濃度和Cl-質(zhì)量濃度分布均有影響。研究表明咸水灌溉不僅影響水鹽分布,,而且對(duì)斥水性也有不同程度的影響,。

    Abstract:

    Saline water irrigation is one of the effective measures for relieving the crisis of agricultural water utilization. Sand and saline-alkali soils were selected and were added with hydrophobic materials. CaCl2 solution with mineral degrees of 0, 1, 3 and 6 g/L were used for laboratory column infiltration experiments, in order to compare the effects of irrigation water quality on the distributions of soil water, soil salt and soil water repellency. The results showed that the curves of cumulative infiltration, wetting front and infiltration rate for sand 1 and wettable saline-alkali soil were all smooth after saline water irrigation. But those for sand 2 and hydrophobic saline-alkali soil were not so smooth, and their infiltration process were much slower than those of sand 1 and wettable saline-alkali soil. The increase of irrigation water mineral degree affected the infiltration process of saline-alkali soil more than that of sand. Philip model and Kostiakov equation were both good for fitting the infiltration curves of wettable soils. After saline water irrigation, the water drop penetration time (WDPT) along the profile increased both for sand 1 and san 2, but the maximal increment was only 3.6 s. The increment of WDPT for saline-alkali soil was obvious and the maximal increment value was 19 s. The increase of irrigation mineral degrees affected electrical conductivity, concentration of Ca2+ and concengtration of Cl-. In conclusion, this study indicated that saline water irrigation affected not only the distributions of soil water and salt, but also that of hydrophobicity.

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巨娟麗,李毅,宋紅陽,劉俊民. CaCl2溶液灌溉對(duì)土壤水鹽與斥水性分布的影響[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2014,45(10):159-166. Ju Juanli, Li Yi, Song Hongyang, Liu Junmin. Effects of CaCl2 Solution Irrigation on Distributions of Soil Water, Salt and Water Repellency[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(10):159-166.

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  • 收稿日期:2013-11-08
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  • 在線發(fā)布日期: 2014-10-10
  • 出版日期: 2014-10-10
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