隔沙层对盐碱地土壤水盐运动的影响  

Effect of sand layer on soil water and salt movement in saline land

作　　者：张莉[1] 丁国栋[1] 王翔宇[1] 赵名彦[1] 郭跃[1] 韦立伟[1] 梁文俊[1] 

机构地区：[1]北京林业大学,教育部水土保持与荒漠化防治重点实验室,北京100083

出　　处：《干旱地区农业研究》2010年第2期197-200,207,共5页Agricultural Research in the Arid Areas

基　　金：国家科技支撑计划课题(2006BAD03A0305)

摘　　要：在80-100 cm范围土层设置沙层,对土壤电导率和含水量进行为期6个月的观察,分析隔沙层对土壤水盐运动的影响。结果表明：80-100 cm层沙层在大降雨量时能够提高土壤含水量;降雨量小,蒸发强烈的5-7月份,隔沙处理能够使土壤积盐程度较对照减少50%-70%;隔沙层延缓沙层以上土壤水分的下渗,从而提高降雨对土壤盐分的淋洗作用。当降雨量接近蒸发量的时候,隔沙处理土壤就能明显脱盐,而在此雨量下,对照只能保证土壤不发生积盐或少量积盐。雨季结束之后,隔沙处理土壤脱盐率较对照提高10%-35%,并能够使土壤脱盐过程持续到10月份,对植物生长十分有利。The effect of sand layer on soil water and salt movement was analyzed based on a 6-month observation about soil conductivity and liquid water content in the experiment that laid sand in 80～100 cm soil profile.The result showed that sand layer in 80～100 cm could increase the soil liquid water content while rainfall is heavy enough;When in May to July that had great amount of evaporation and small amount of rainfall,with sand layer,the degree of soil salt accumulation could decrease by 50%～70% compared with the control;Sand layer could prolong the process of infiltration under sand layer,then strengthened the eluviation effect of rainfall.Soil salt content decreased significantly in sand-layered soil when rainfall was near to evaporation,and it didn＇t increase or increase a litter in the control.When rainy season ended,soil desalinization ratio increased by 10%～35% compared with the control,and the process of soil desalting could continue to October,which is very beneficial for the growing of plants.

关 键 词：盐碱地 隔沙层 水盐运动 

分 类 号：S156.4[农业科学—土壤学]