降雨及隔盐层对滨海盐碱地水盐运动的影响  

Effects of rainfall and salt layers on water and salt movement in coastal saline land

作　　者：殷小琳[1] 丁国栋[1] 张维城[1] 

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

出　　处：《中国水土保持科学》2011年第3期40-44,共5页Science of Soil and Water Conservation

基　　金："十一五"林业科技支撑计划"盐碱地造林技术研究"(2006BAD03A0305)

摘　　要：为探索不同材料隔盐层对滨海盐碱地水盐运动的影响,在白蜡林地树穴底部布设炉渣和沙子作为隔盐层,比较研究不同深度土壤水分和总盐分的季节性变化规律。结果表明:土壤表层和不同深度处土壤含水量及含盐量变化规律不同,表层主要受降雨和蒸发影响,底层则同时还受地下水位变化的影响;1个雨季中,土壤表层强降雨的淋洗作用极为明显,表层不同隔盐层的差异性不太明显,但离表层30 cm处各隔盐层隔盐和抑制返盐的效果非常明显,设置炉渣隔盐层处理的电导率从5月份的591 m s/m下降到了10月份的493 m s/m,沙子隔盐层处理的电导率从558 m s/m下降到501 m s/m;离表层60 cm处炉渣隔盐层从810 m s/m下降到582 m s/m,沙子隔盐层从607 m s/m下降到560 m s/m。从减小电导率的幅度上来看,炉渣的隔盐效果好于沙子。In order to discover the effects of different salt layers on water and salt movement in coastal saline land,slag and sand were designed as salt layers in Fraxinus chinensis forests to compare and study the seasonal change rules of soil moisture and soil salinity at different depths.Results show that the soil moisture and salinity are affected by different factors at the surface and different depths of soil.At the surface,soil moisture and salinity are mainly affected by rainfall and evaporation,while at the lower depths,groundwater table is another affecting factor.In the rainy season,high intensity rainfall has great leaching function on the soil surface,but there is no obvious difference between two salt layers.However,for the soil at 30cm depth,the salt layers with slag and sand has a strong effect on inhibition of return effect of soil.The conductivity of salt layers decreased from 591 ms/m in May to 493 ms/m in October with slag and from 558 ms/m down to 501 ms/m with sand.For the soil at 60cm depth,the conductivity of salt layers decreased from 810 ms/m in May to 582 ms/m in October with slag and from 607 ms/m to 560 ms/m with sand.It is also found that the slag has better effect on inhibition of conductivity than sand.

关 键 词：土壤水分 水盐运动 隔盐层 滨海盐碱地 

分 类 号：S562[农业科学—作物学]