Effects of Superabsorbent Polymers on Infiltration and Evaporation of Soil Moisture Under Point Source Drip Irrigation
Effects of Superabsorbent Polymers on Infiltration and Evaporation of Soil Moisture Under Point Source Drip Irrigation
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DOI：
10.1002/ird.1883
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发表时间：
2015-04
影响因子：
1.9
通讯作者：
Linlin Yang;Yuguo Han;Peiling Yang;Chengzhi Wang;Sheng-Jie Yang;Shuya Kuang;Hanzheng Yuan;C. Xiao
中科院分区：
文献类型：
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作者：
Linlin Yang;Yuguo Han;Peiling Yang;Chengzhi Wang;Sheng-Jie Yang;Shuya Kuang;Hanzheng Yuan;C. Xiao
保水剂在农业上的应用可以提高水分利用效率，缓解农业缺水问题。在点源灌溉条件下，通过在土壤根区中层施施保水剂，研究了保水剂对土壤入渗和蒸发过程中水分分布的影响。结果表明：在入渗过程中，湿润锋在水平方向上形成了一个突变区；在下层，由于来自中层的汁液的影响，水平入渗率大于垂直入渗率；中层土壤含水率显著增加了23.6%，高于表层和下层；蒸发过程中，由于表层强烈蒸发，表层土壤含水率变化较大，土壤水分变化比较均匀，由于混合层蓄水，下层土壤含水率下降幅度最小。因此，在作物根层施保水剂有利于保持作物根区土壤水分，抑制下层土壤水分蒸发，有利于保持土壤水分。版权所有©2015 John Wiley&Sons，Ltd.
The application of superabsorbent polymers (SAPs) in agriculture can enhance water use efficiency and ease water shortage in agriculture. In this study, by applying SAPs to the middle layer of the soil root zone, the effects of SAPs on moisture distribution during infiltration and evaporation under the condition of point source irrigation were investigated. The results show that during infiltration, the wetting front formed an accident change zone in the horizontal direction; in the bottom layer, the horizontal infiltration rate is greater than the vertical infiltration rate due to the effect of SAPs from the middle layer; the soil water content in the middle layer increased remarkably by 23.6%, higher than that in the surface and bottom layers; during evaporation, the soil water content changed significantly in the surface layer due to strong evaporation on the surface, it was largest and quite even in the SAP–soil mixture layer, and decreased the least in the bottom layer due to water storage in the mixture layer. Therefore, SAP application in the crop root layer is helpful to conserve soil water content in the crop root zone, inhibit evaporation of soil water in the lower layer and facilitate moisture conservation. Copyright © 2015 John Wiley & Sons, Ltd.