| 季节性冻融期覆砂对太谷农田土壤含水率时空变化的影响 |
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| 引用本文： | 冯慧君,赵浩然,郑秀清,陈军锋,苗春燕,薛静.季节性冻融期覆砂对太谷农田土壤含水率时空变化的影响[J].干旱地区农业研究,2019,37(5):40-45. |
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| 作者姓名： | 冯慧君 赵浩然 郑秀清 陈军锋 苗春燕 薛静 |
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| 作者单位： | 太原理工大学 水利科学与工程学院,山西 太原,030024;太原理工大学 水利科学与工程学院,山西 太原030024;山西省第一水文地质工程地质队,山西 太原030024 |
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| 基金项目： | 国家自然科学基金面上项目（41572239）；国家自然科学青年基金项目（41502243） |
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| 摘 要： | 研究了冻融期砂层覆盖对剖面土壤含水率的影响。野外试验于2016年11月—2017年3月在山西省太谷均衡实验站进行，主要监测3种地表处理剖面0~100 cm土壤含水率，各处理分别为无覆盖（LD）、0.5~1.5 mm粒径（XS）和1.5~2.0 mm粒径砂层覆盖（CS）。结果表明：冻融期砂层覆盖及土壤水分冻融使得XS和CS处理土壤剖面出现两个水分高值区，即近地表（15.40%~21.79%）和剖面20~40 cm间（15.99%~19.94%）；砂层覆盖对近地表有储水效果，储水效果随土壤深度增加而逐渐减小。覆砂处理对地表处储水效果最佳，平均土壤含水量较LD处理高8.45%~10.94%。覆砂对剖面0~40 cm有明显的储水效果，平均土壤含水率较LD处理高1.56%~1.62%。 40 cm以下3种处理土壤含水率相差较小，平均土壤含水率差值为0.09%~0.40%；砂层覆盖储水效果还与砂层粒径有关，XS处理0~5 cm储水效果优于CS处理，其土壤含水率高于CS处理0.57%~2.39%；地表砂层覆盖可以平抑地表土壤含水率变化，覆砂处理地表土壤含水率变幅较LD处理低约4.42%。
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| 关 键 词： | 季节性冻融期 砂层覆盖 农田土壤含水率 动态变化 |
Effect of sand mulching on spatiotemporal variation of soil water content during the seasonal freezing-thawing period |
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| FENG Hui-jun,ZHAO Hao-ran,ZHENG Xiu-qing,CHEN Jun-feng,MIAO Chun-yan,XUE Jing.Effect of sand mulching on spatiotemporal variation of soil water content during the seasonal freezing-thawing period[J].Agricultural Research in the Arid Areas,2019,37(5):40-45. |
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| Authors: | FENG Hui-jun ZHAO Hao-ran ZHENG Xiu-qing CHEN Jun-feng MIAO Chun-yan XUE Jing |
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| Institution: | College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China,College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China,College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China,College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China,College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; First Hydrogeology and Engineering Geological Team of Shanxi Province, Taiyuan, Shanxi 030024, China and College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China |
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| Abstract: | The effect of sand mulching on soil water content was studied during the seasonal freezing-thawing period. A field experiment, involving bare plot (LD), sand mulches of particle size of 0.5~1.5 mm (XS) and 1.5~2.0 mm (CS), was set up in Taigu Water Balance Experimental Field to monitor soil water content in the soil layer of 0~100 cm. The results showed that, two higher-soil-moisture areas were formed with sand mulching treatments, which located at the near-surface of 20~40 cm. Soil water content on surface varied from 15.40% to 21.79% and ranged from 15.99% to 19.94% in the layer of 20~40 cm. Sand mulches had a significant effect on storing water, and the effect decreased with increasing soil depth. Sand mulching treatments resulted in more stored water in surface soil with value-added ranging from 8.45% to 10.94% of soil water content. Sand mulching treatments resulted less water storage in the layer of 0~40 cm with value-added varying from 1.56% to 1.62%. The differences of soil water content between the three treatments in the layer of 40~100 cm were slight, ranging from 0.09% to 0.40%. In addition, the effect of sand mulching on water storage was related to the particles size of sand. The water storage of XS treatment in the 0~5 cm layer was better than that of CS treatment. Soil water content of XS treatment in the layer of 0~5 cm was 0.57%~2.39% higher than that of CS treatment. Sand mulching resulted in a reduction of variations on surface soil water content, which reduced variations about 4.42%. |
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| Keywords: | seasonal freezing-thawing period sand mulching soil water content in farmland dynamic change |
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