干旱区生态环境知识资源中心(Arid): 干湿交替对添加保水剂的砂土持水性能的影响

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	干湿交替对添加保水剂的砂土持水性能的影响
其他题名	Effects of drying-rewetting alternation on water-holding capacity of sandy soil added with super absorbent polymer
	赵雪晴; 王冬梅; 张泽洲; 张琳琳; 高飞; 吴林川
来源期刊	中国水土保持科学
ISSN	2096-2673
出版年	2020
卷号	18 期号:1 页码:90-99
中文摘要	保水剂常应用于干旱半干旱区的砂土中以提高土壤持水性能。干湿交替会削弱保水剂的耐用性,但干湿交替如何影响添加保水剂的砂土的持水性能的研究较少;因此,作者以添加保水剂砂土为研究对象,利用模拟土柱试验方法,设置保水剂类型、保水剂用量和干湿交替次数等因素进行实验,研究干湿交替对添加保水剂的砂土持水性能的影响。结果表明:1)分别添加低中高3种用量的丙烯酰胺-丙烯酸盐共聚交联物保水剂、聚丙烯酸/凹凸棒复合保水剂、聚丙烯酰胺型保水剂的砂土,其饱和含水率以及孔隙度提高,Gardner模型参数a提高,累计蒸发量减少。且保水剂用量越多,影响程度越大,其中含用量为6 g/kg的丙烯酰胺-丙烯酸盐共聚交联物类保水剂的砂土持水性能最优。2)经过干湿交替后,添加保水剂的砂土的饱和含水率以及孔隙度减少、持水性能和抑制水分蒸发效果削弱。干湿交替后,含高用量的3类保水剂的砂土持水性能削弱效果均大于含低用量的3类保水剂的砂土持水性能削弱效果。3)含保水剂的砂土在1 ~ 3次干湿交替过程中,速效水含量增加;3 ~ 6次干湿交替后,速效水含量减少。10次干湿交替后持水性能仍优于未添加保水剂的砂土。由此可见,干湿交替会削弱保水剂对砂土持水性能的改良效果,但保水剂仍具有一定的使用价值。
英文摘要	[Background]Super absorbent polymer (SAP) is a kind of polymer with high hydrophilicity and repeated suction function.In arid and semi-arid areas,it is an effective measure to add SAP to sandy soil in order to restore ecological environment and improve physical and chemical properties of soil.For SAP applied in arid and semi-arid sandy soil,its durability is related to the long-term effect of drought resistance and moisture preservation.Drying-rewetting alternation is a common phenomenon in arid and semi-arid areas.SAP added to the soil will absorb water and expand when climate is wet,and slowly lose water when climate is dry,and go through the process of repeated water absorption and water loss.Although the existing studies have mentioned the possible impact of this process on the water retention performance of the SAP,there are few experimental verification and analysis of the impact mechanism.[Methods]In order to study the effect of drying-rewetting alternation on sand soil with SAP,sand soil in Lingwu city of Ningxia Hui Autonomous Region was selected as the research object.Different cycles of drying-rewetting alternation,different types and amounts of SAP were selected as experimental variables to complete the simulated soil column experiment.The soil physical and chemical properties,soil cumulative evaporation,soil water characteristic curves and soil moisture availability were selected as the test indexes.[Results] 1) The saturated water content and total porosity of sandy soil with SAP increased,the Gardner model parameter a of sand soil with SAP increased,and the cumulative evaporation decreased.The more the amount of SAP was,the greater the impact was.The water-holding capacity of sandy soil containing 6 g/kg acrylamide acrylate copolymer cross-linker was the best.2) After several drying-rewetting alternations,the effect of increasing the soil water-holding capacity was reduced,the saturated water content and total porosity of sandy soil decreased,and the cumulative evaporation of sandy soil increased.After several drying-rewetting alternations,the water-holding capacity of sand soil with high dosage of SAP weakened more than that with low dosage of SAP.3) The soil available water content of the sand soil with SAP increased after 1 to 3 cycles of drying-rewetting alternation and it decreased after 3 to 6 cycles of drying-rewetting alternation.After 10 drying-rewetting alternations,the soil water-holding capacity of sand soil with SAP was still better than that of sandy soil without SAP.[Conclusions]The drying-rewetting alternation may weaken the water-holding capacity of sand soil with SAP by reducing the saturated water content and total porosity.However,the drying-rewetting alternation increases the soil available water content of the sand soil with SAP and then decreases,thus SAP still has a strong application value.
中文关键词	保水剂 ; 干湿交替 ; 砂土 ; 土壤水分特征曲线
英文关键词	super absorbent polymer drying-rewetting alternation sand soil soil water characteristic curves
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:6734041
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336533
作者单位	赵雪晴, 北京林业大学水土保持学院, 100083.; 王冬梅, 北京林业大学水土保持学院, 100083.; 张泽洲, 北京林业大学水土保持学院, 100083.; 张琳琳, 沃德兰特(北京)生态环境技术研究院有限公司, 北京 100101, 中国.; 高飞, 沃德兰特(北京)生态环境技术研究院有限公司, 北京 100101, 中国.; 吴林川, 沃德兰特(北京)生态环境技术研究院有限公司, 北京 100101, 中国.
推荐引用方式 GB/T 7714	赵雪晴,王冬梅,张泽洲,等. 干湿交替对添加保水剂的砂土持水性能的影响[J],2020,18(1):90-99.
APA	赵雪晴,王冬梅,张泽洲,张琳琳,高飞,&吴林川.(2020).干湿交替对添加保水剂的砂土持水性能的影响.中国水土保持科学,18(1),90-99.
MLA	赵雪晴,et al."干湿交替对添加保水剂的砂土持水性能的影响".中国水土保持科学 18.1(2020):90-99.