银川北部平原土壤水分运动状态类型及水盐运移机理研究

根据银北平原江南村盐碱地改良试验工作中取得的包气带-地下水系统的土壤水势、土壤含水量、土壤溶液浓度、土壤含盐量、潜水埋深等动态资料,分析研究了试验区土壤水分运移基本类型及水盐运移机理。结果表明,在试验区内,种植区的土壤水盐运移主要受灌溉和蒸发的制约,土壤水盐运移特征呈灌溉-蒸发型,荒地区的土壤水盐运移主要受降水和蒸发的制约,土壤水盐运移特征呈降水-蒸发型。在此基础上,重点分析了种植区在一个年度内的2个大的脱盐阶段和2个大的积盐阶段的土壤水盐运移机理,即春灌前、灌期、秋季和冬灌等阶段水盐运移机理及荒地土壤水盐运移机理。

Analyses of Moisture Movement Types and Movement Mechanism of Moisture and Salinity at Soil Section

According to the observing data,including soil moisturepotential,soil moisture content,soil solution concentration,soil salinity,depth of groundwater table,soil temperature,from unsaturatingzone in Jiangnan,North Yinchuan Plain,the movement mechanism of salt and moisture at soil section was analyzed.The results were as follows: the movement of soil moisture in farmland wasmainly controlledby irrigation and evaporation,belongingto irrigation-evaporation type,whereas the movement of soil moisture in wasteland wasmainly controlled by precipitation and evaporation,belongingto precipitation-evaporation type.This paper mainly discussedthe movement mechanism of salt and moisture at soil section during two main desalting stages and two main salinificationstages in farmland,including salinificationstage before spring irrigation,desalting stage when irrigating,salinificationstage in fall and desalting stage during winter irrigation.