环渤海平原土壤盐分不同聚型的水动力学特征  

Moisture Dynamics Characteristics of the Soils Profile of Different Salinity Poly Types in the Bohai Sea Plain

作　　者：张光辉[1] 刘春华[1] 严明疆[1] 王金哲[1] 周在明[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《吉林大学学报（地球科学版）》2012年第6期1873-1879,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41172214);国家科技支撑计划项目(2009BADA3B05)

摘　　要：为了解环渤海低平原微咸水灌溉的土壤容盐能力问题,对大量野外监测和采样测试数据进行了研究。结果表明,该平原的土壤盐分剖面分布特征具有表聚型、中聚型和底聚型3种类型,其与蒸发、降水或灌溉入渗影响和潜水位埋深变化相关。不同聚型剖面形成的水动力特征各不相同:表聚型土壤盐分剖面的水势梯度指向地表,其绝对值远大于1.0cmH2O/cm;中聚型土壤盐分剖面上部的水势梯度指向地下水面,剖面下部的水势梯度指向地表;底聚型土壤盐分剖面的水势梯度指向地下水面,水势梯度大于1.0cmH2O/cm。表聚型土壤盐分剖面不利于微咸水灌溉农田和作物生长。For the issues of brackish water capacity of soil salt content for safe irrigation in the low plain around the Bohai Sea,it is expounded that characteristics on the soils profile of different salinity accumulation types are that distribution of soil salt content is accumulation in the upper of the soil profile,or in the middle of the soil profile and in bottom of the soil profile.The formation of different salinity poly types are with evaporation,infiltration of rainfall or irrigation and water table depth change related,according to the data from the field monitoring and sampling.The formation of different characteristics of these polymer profiles are in different hydrodynamic condition.The soil moisture potential gradient profiles point to the surface,its absolute value is much larger than 1.0 cmH2O/cm with the formation of salt accumulation to the upper of the soil profile.The soil moisture potential gradient point to groundwater table in the upper of the profile and point to the surface in bottom of the profile with the formation of salt accumulation to the middle of the soil profile.The soil moisture potential gradient profiles point to groundwater table,its value is much larger than 1.0 cmH2O/cm with the formation of salt accumulation to the bottom of the soil profile.The brackish soil is not suitable for land and crops irrigation using slightly salty water.

关 键 词：环渤海低平原 地下水 土壤 盐分 土壤水势 

分 类 号：S152[农业科学—土壤学]