冻融条件下土壤水分和速效磷垂直迁移规律

发布时间：2018-06-13 04:24

本文选题：冻融作用 + 含水率　；参考：《水土保持研究》2017年03期

【摘要】：中国东北地区土壤普遍受到的季节性冻融作用会影响土壤中速效磷和水分的垂直分配。通过室内模拟冻融环境,分析了冻融循环条件下黑土速效磷和土壤水分的垂直变化。结果表明:多次冻融循环作用使土壤速效磷随着土壤水分由下层向表层迁移,经30次冻融循环作用后土壤最大含水率和土壤最大速效磷含量均出现在3cm层;土壤初始含水率越高,冻融作用后向土壤表层迁移的速效磷含量越大,但随着冻融循环次数增加,土壤各层速效磷含量都有所下降,1次冻融作用后,土壤速效磷的最高含量为50.63mg/kg,30次后最高含量为43.81mg/kg,减少了13.5%;利用多元回归分析分别得出了冻融循环后土壤含水率和速效磷与初始含水率、冻融循环次数和土层深度的关系函数,相关系数分别为0.892,0.578。上述研究成果为季节性冻融区非点源污染及土壤盐碱化防治奠定理论基础。
[Abstract]:Seasonal freezing and thawing of soils in Northeast China will affect the vertical distribution of available phosphorus and water in soils. The vertical changes of available phosphorus and soil moisture in black soil under freeze-thaw cycle were analyzed through indoor simulation of freeze-thaw environment. The results showed that the soil available phosphorus migrated from the lower layer to the surface with the action of multiple freeze-thaw cycles. After 30 freeze-thaw cycles, the maximum soil moisture content and the maximum available phosphorus content appeared in the 3cm layer. The higher the initial moisture content of the soil, the greater the available phosphorus content migrated to the topsoil after freezing and thawing, but with the increase of freeze-thaw cycles, the available phosphorus content in each layer of the soil decreased after one freeze-thaw process. The maximum content of available phosphorus in soil was 50.63 mg / kg ~ (-1) 路kg ~ (-1) after 30 times, the maximum content was 43.81 mg 路kg ~ (-1) 路kg ~ (-1), which decreased 13.55.The relationship function of soil moisture content and available phosphorus with initial moisture content, freeze-thaw cycle times and soil depth was obtained by multiple regression analysis. The correlation coefficients were 0.892n0.578. These results lay a theoretical foundation for the prevention and control of non-point source pollution and soil salinization in seasonal freeze-thaw regions.
【作者单位】：沈阳农业大学水利学院;
【基金】：国家自然科学基金项目(41101256,41371272) 辽宁省高等学校优秀人才支持计划(LJQ2013074)
【分类号】：S152.7;S153

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