CAJ | 학술논문

通过在天津滨海新区的野外灌水脱盐试验,对比分析了灌溉淡水、中水和微咸水的中壤质、重壤质土和粘土土壤含盐量及pH的动态变化.结果表明,粘质滨海盐土经灌淡水后的土壤全盐量降低是逐渐的;重壤质滨海盐土的土壤全盐变化趋势与粘质土相似,最初4次灌水使各层土壤全盐累积降幅较大;中壤质滨海盐土则第一次灌水后土壤含盐量降低较多,表层(0～20 cm)由1.75%降到0.511%,以后灌溉土壤全盐量降低得较缓慢,20～40 cm土层的含盐量始终降低得较缓慢.灌溉淡水、中水、微咸水均能使土壤全盐量降低,灌溉中水、微咸水后表层和土体下层土壤的含盐量均逐渐降低,而灌溉淡水的表层土壤全盐量以初次降低明显,土体下层的土壤全盐量始终变化幅度较小.同灌淡水的情况下,中壤质滨海盐土的土壤pH较为稳定,在7.5～8.5范围,而重壤质和粘土在最初表现下降,至约7.5后上升到8.5～9.0范围,质地越粘土壤pH越高.灌溉淡水、中水、微咸水均使土壤pH有升高的趋势,灌溉淡水后表层土壤pH能够上升到9.0,灌溉微咸水、中水后土壤pH能够升高至8.5左右.
통과재천진빈해신구적야외관수탈염시험,대비분석료관개담수、중수화미함수적중양질、중양질토화점토토양함염량급pH적동태변화.결과표명,점질빈해염토경관담수후적토양전염량강저시축점적;중양질빈해염토적토양전염변화추세여점질토상사,최초4차관수사각층토양전염루적강폭교대;중양질빈해염토칙제일차관수후토양함염량강저교다,표층(0～20 cm)유1.75%강도0.511%,이후관개토양전염량강저득교완만,20～40 cm토층적함염량시종강저득교완만.관개담수、중수、미함수균능사토양전염량강저,관개중수、미함수후표층화토체하층토양적함염량균축점강저,이관개담수적표층토양전염량이초차강저명현,토체하층적토양전염량시종변화폭도교소.동관담수적정황하,중양질빈해염토적토양pH교위은정,재7.5～8.5범위,이중양질화점토재최초표현하강,지약7.5후상승도8.5～9.0범위,질지월점토양pH월고.관개담수、중수、미함수균사토양pH유승고적추세,관개담수후표층토양pH능구상승도9.0,관개미함수、중수후토양pH능구승고지8.5좌우.
The field experiments of irrigation with fresh water,recycled water,brackish water were carried out on coastal solonchak soil in Tianjin Binhai new developed area,Contrasted and analyzed the dynamic state variety of soil salt content and pH in clay soil,heavy loamy soil,and medium loamy soil.The results showed that soil salt content in clay soil and heavy loamy soft lowered gradually after irrigating fresh water,whik soil salt content in medium loamy soil reduced more rapidly after the first time irrigsting with the fresh water.especially,that in surface layer(O～20 cm),was declined to 0.511%from 1.75%,then after,it lowered rather slowly with additional irrigation.The salt content in 20～40 cm layer ofall three soils was declined slowly all the time.Salt content of both surface layer and lower layers of medium loamy soil was declined gradually all the time on the condition of irrigating both recycled water and brackish water.Irrigating fresh water,re-cycled water,brackish water all made the trend that soil pH increased as soil salt content decreased.Soil pH of the surface layer soil achieved 9.0 after irrigating the fresh water,while pH of the surface layer soil finally went up to 8.5 or 80 after irrigating the brackish water or the recycled water.