基于高密度电阻率法的莱州湾南岸滨海碱土水盐运移规律

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中图分类号：S151.9 文献标志码：A

Abstract：To makefulluseof alkalisoil resources，improvelanduseefciencyandexplore the waterandsalt migration lawsof typical alkali soils，outdoralkali soilsampleplotsandfluvo-aquic soil sample plots were establishedonthe south bank of Laizhou Bay.Comparative experiments of repeated irrigation were carredout with brackish water with asalinity of 5g/L . High-density electricalresistivity tomography was employed to perform both two-andthre-dimensional monitoring of soilelectrical resistivity.The inversionresultswere further analyzed tocharacterize the migrationpathwaysand dynamic evolution of soil waterandsalt in different soil media.Theresults show that following multiple irrigation events， thewatercontentof thedepthofO-2Ocmsoillayer increasesinboth thealkalinesoil plotsandthefluvo-aquicaoil plots， whilethat of the depth of 20-50 cmlayer decreases.At a depth of 5O cm，the water content of the fluvo-aquic soil is slightlyhigherthanthatofthealkalinesoil.Withtheaccumulationof irigationevents，soilresistivityofthealkaline soil plotsdecreases progressvelyacrossdepths，indicating enhanced ionicconductivityduetothe accumulationof waterand salt.Duringtheinitial stagesofbrackish wateririgation，lateralvariationofresistivityispronouncedinthefluvo-aquic soil，but gradually becomes stratified with subsequent irrigations. At the depth of 50cm ，the soil electrical conductivity of the fluvo-aquic soil exceeds that of the alkaline soil，reflecting a more rapid vertical transport of water and salt.

Keywords：migrationof waterandsalt；brackish water；soil resistivity；high-densityelectricalresistivitymethod；the south coast of Laizhou Bay

微咸水一般指矿化度为 2～5g/L 的含盐水[1]在淡水资源紧缺的华北、西北等区域，微咸水能在一定程度上缓解城市生活水资源短缺的问题，也为农业可持续发展提供潜在水源。（剩余8994字）