树枝覆盖与保水剂对土壤水分的影响  

Influence of Branch Cover and Water Retaining Agent on Soil Water

作　　者：杨直毅[1,2] 汪有科[1,2,3] 赵颖娜[3] 黎朋红[3] 段雪松[3] 

机构地区：[1]中国科学院水利部水土保持研究所,陕西杨凌712100 [2]中国科学院研究生院,北京100049 [3]西北农林科技大学,陕西杨凌712100

出　　处：《灌溉排水学报》2010年第1期97-99,共3页Journal of Irrigation and Drainage

基　　金：国家科技支撑项目(2007BAD88B05)

摘　　要：通过野外定位试验，研究了树枝覆盖和保水剂对土壤水分的影响。结果表明，树枝覆盖抑制土壤蒸发的效果明显，在土壤含水量大于16％时，可抑制2／3左右的土壤蒸发，树枝覆盖可提高表层土壤含水量达30％；滴灌条件下保水剂穴施可明显减少土壤水分的垂直入渗，提高湿润体的平均土壤含水量；滴灌条件下树枝覆盖结合保水剂穴施节水效果明显，使0～70cm深度的土壤含水量增加了24％。The results of located experiments about influence of branch cover and water retaining agent on soil water showed that., the effect of evaporation restrainted by branch cover is obvious. The branch cover could inhibit about 2/3 soil evaporation when soil water content is more than 16%. And branch cover can improve topsoil water content by 30% Water retaining agent used by spot application resulted in decreasing of water vertical infiltration and increasing of water content of wetting soil under drip irrigation. The method of branch cover combined with water retaining agent can save water significantly under drip irriga- tion. It improved water content of 0-70 cm of soil layer by 24%.

关 键 词：树枝覆盖 保水剂 土壤水分 土壤蒸发 

分 类 号：S152.7[农业科学—土壤学]