| 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 |
| 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 |
| Effect of sand mulching on spatiotemporal variation of soil water content during the seasonal freezing-thawing period |
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| DOI：10.7606/j.issn.1000-7601.2019.05.07 |
| 中文关键词: 季节性冻融期 砂层覆盖 农田土壤含水率 动态变化 |
| 英文关键词:seasonal freezing-thawing period sand mulching soil water content in farmland dynamic change |
| 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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| 中文摘要: |
| 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%。 |
| 英文摘要: |
| 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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