季节性冻融期不同地表覆盖对土壤温度时空变化的影响

发布时间：2018-06-18 07:46

本文选题：季节性冻融期 + 地表覆盖　；参考：《节水灌溉》2017年08期

【摘要】：为了揭示季节性冻融期地表覆盖对土壤温度时空变化的影响,分别设置了裸地(LD)、秸秆覆盖(JG)和地膜覆盖(DM)3种处理,运用数理统计学法和灰色关联度法对冻融过程不同深度的土壤温度随时间的变化进行了统计分析。结果表明:地膜覆盖对土层具有显著的增温效应;秸秆覆盖对土壤温度的影响在不同的冻融阶段有所差异:冻结阶段,秸秆覆盖减少了土壤热量的散失,对土层具有增温作用;融化阶段,秸秆覆盖减弱了地气间的热交换,抑制了土层温度的增加。地膜和秸秆覆盖可以平抑土壤剖面地温的变幅。在整个冻融期,两种覆盖处理均对地温产生影响,0~20 cm对地温的影响较大,20~90 cm地温随土壤深度的加深,土壤温度的波动幅度逐渐减小。研究成果对于季节性冻土区地表覆盖措施的选取提供依据。
[Abstract]:In order to reveal the effect of surface mulching on soil temperature in seasonal freezing and thawing period, three treatments were set up, I. e., LDD, JG and DMN, respectively. The variation of soil temperature with time in different depths of freeze-thaw process was analyzed by mathematical statistics and grey correlation method. The results showed that mulching with mulch had significant warming effect on soil layer, and the effect of straw mulching on soil temperature was different in different freezing and thawing stages: in freezing stage, straw mulching reduced the loss of soil heat and increased soil temperature. In the melting stage, straw mulch weakens the heat exchange between soil and atmosphere and inhibits the increase of soil temperature. Film mulching and straw mulching can stabilize the variation of soil temperature in soil profile. During the whole freezing and thawing period, the effect of the two mulching treatments on the soil temperature was greater than that of 20 ~ 20 cm. With the deepening of soil depth, the fluctuation range of soil temperature decreased gradually. The research results provide the basis for the selection of surface cover measures in seasonal frozen soil regions.
【作者单位】：太原理工大学水利科学与工程学院;
【基金】：国家自然科学基金资助项目(41572239,41502243) 高等学校博士学科点专项科研基金资助项目(20131402110008) 山西省自然科学基金资助项目(2015021169)
【分类号】：S152.8

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