压砂地砂土覆盖对土壤水分蒸发的影响研究
发布时间：2018-08-01 16:47
【摘要】：本文针对宁夏中卫市香山地区土壤水分蒸发过程不明确的问题,通过田间试验研究了不同土壤水分条件下不同砂土覆盖和不同砂土混合比例对土壤水分蒸发的影响,得出的主要结论如下：(1)通过对土壤蒸发阈值的正交分析,结果表明影响土壤蒸发闽值的试验因素重要顺序为：降雨量砂土混合比例砂土覆盖厚度,其中降雨量是高度显著影响因素,砂土混合比例为显著影响因素,砂土覆盖厚度为次要影响因素。(2)通过对不同降雨量、砂土覆盖厚度和砂土混合比例下土壤累积蒸发量随时间变化的拟合分析和最小二乘法线性拟合,结果表明不同降雨量、覆盖厚度、混合比例下土壤累积蒸发量随时间的变化特征都可以用对数函数式来表示,相关系数均大于0.83。(3)通过对不同降雨量、砂土覆盖厚度和砂土混合比例下各处理土壤含水率随时间变化的分析,发现土壤含水率随时间的变化程度随着降雨量、砂土覆盖厚度和砂土混合比例的增大均呈减小趋势,且覆盖厚度越大对土壤水分蒸发的抑制效果越显著,当砂土混合比例增大到100%时,五种处理含水率的变化幅度相一致,说明砂石覆盖对抑制土壤蒸发的效果最显著。(4)利用最小二乘法对降雨量、砂土覆盖厚度、砂土混合比例下的土壤水分蒸发计算阈值与实际阈值进行相似性分析,发现土壤水分蒸发阈值与降雨量、砂土覆盖厚度、砂土混合比例三因素间呈多项式函数关系,相关系数大于0.89。本文的研究结果为压砂地灌溉制度的优化和生态环境的恢复提供数据支撑,促进压砂地农业的可持续发展。
[Abstract]:In view of the unclear process of soil moisture evaporation in Xiangshan area of Zhongwei City in Ningxia, the effects of different mulching and mixing ratio of sand and soil on soil water evaporation under different soil moisture conditions were studied through field experiments. The main conclusions are as follows: (1) through the orthogonal analysis of soil evaporation threshold, the results show that the important order of experimental factors affecting soil evaporation threshold is: rainfall sand mixed proportion sand cover thickness, Rainfall is a highly significant factor, sand mixing ratio is a significant factor, sand cover thickness is a secondary factor. (2) through the different rainfall, The fitting analysis of the variation of soil cumulative evaporation with time and the linear fitting of the least square method under sand cover thickness and sandy soil mixing ratio show that different rainfall and mulch thickness can be obtained. The variation characteristics of soil cumulative evaporation with time can be expressed by logarithmic function under mixed ratio, and the correlation coefficient is more than 0.83.3. (3) through different rainfall, The variation of soil moisture content with time under sandy soil cover thickness and sand / soil mixing ratio was analyzed. It was found that the variation degree of soil moisture content with time decreased with rainfall, and the increase of sand cover thickness and sand / soil mixing ratio showed a decreasing trend. The larger the mulching thickness is, the more significant the inhibition effect of soil moisture evaporation is. When the mixing ratio of sand and soil increases to 100, the change range of water content of the five treatments is the same. The results show that sand and stone mulch is the most effective method to restrain soil evaporation. (4) the similarity analysis between soil moisture evaporation calculation threshold and actual threshold under rainfall, sand cover thickness, sand and soil mixing ratio is carried out by least square method. It was found that the soil moisture evaporation threshold was polynomial function relation with rainfall, sand cover thickness, sand mixing ratio, and the correlation coefficient was greater than 0.89. The results of this paper provide data support for the optimization of irrigation system and the restoration of ecological environment, and promote the sustainable development of sanded land agriculture.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S152.7
本文编号：2158208
[Abstract]:In view of the unclear process of soil moisture evaporation in Xiangshan area of Zhongwei City in Ningxia, the effects of different mulching and mixing ratio of sand and soil on soil water evaporation under different soil moisture conditions were studied through field experiments. The main conclusions are as follows: (1) through the orthogonal analysis of soil evaporation threshold, the results show that the important order of experimental factors affecting soil evaporation threshold is: rainfall sand mixed proportion sand cover thickness, Rainfall is a highly significant factor, sand mixing ratio is a significant factor, sand cover thickness is a secondary factor. (2) through the different rainfall, The fitting analysis of the variation of soil cumulative evaporation with time and the linear fitting of the least square method under sand cover thickness and sandy soil mixing ratio show that different rainfall and mulch thickness can be obtained. The variation characteristics of soil cumulative evaporation with time can be expressed by logarithmic function under mixed ratio, and the correlation coefficient is more than 0.83.3. (3) through different rainfall, The variation of soil moisture content with time under sandy soil cover thickness and sand / soil mixing ratio was analyzed. It was found that the variation degree of soil moisture content with time decreased with rainfall, and the increase of sand cover thickness and sand / soil mixing ratio showed a decreasing trend. The larger the mulching thickness is, the more significant the inhibition effect of soil moisture evaporation is. When the mixing ratio of sand and soil increases to 100, the change range of water content of the five treatments is the same. The results show that sand and stone mulch is the most effective method to restrain soil evaporation. (4) the similarity analysis between soil moisture evaporation calculation threshold and actual threshold under rainfall, sand cover thickness, sand and soil mixing ratio is carried out by least square method. It was found that the soil moisture evaporation threshold was polynomial function relation with rainfall, sand cover thickness, sand mixing ratio, and the correlation coefficient was greater than 0.89. The results of this paper provide data support for the optimization of irrigation system and the restoration of ecological environment, and promote the sustainable development of sanded land agriculture.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S152.7
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