保护地蔬菜栽培对土壤盐分积累及pH值的影响  

Effects of Protected Field Vegetable Cultivation on Soil Salinity Accumulating and pH

作　　者：范庆锋[1] 张玉龙[1] 陈重[1] 

机构地区：[1]沈阳农业大学土地与环境学院,辽宁省农业资源与环境重点实验室,辽宁沈阳110161

出　　处：《水土保持学报》2009年第1期103-106,共4页Journal of Soil and Water Conservation

基　　金：辽宁省重大农业攻关项目(2006215005);辽宁省教育厅资助项目(05L386);辽宁省教育厅创新团队资助项目(2007T156)

摘　　要：对辽宁省沈阳市于洪地区保护地土壤盐分含量及其离子组成和土壤pH值进行测定分析,研究保护地蔬菜栽培对土壤盐分和土壤pH值的影响。结果表明,保护地土壤的盐分含量和电导率均明显高于露地土壤,露地土壤平均盐分含量为0.29 g/kg,露地改为保护地10年左右土壤的平均含盐量上升至1.56 g/kg,相应的EC值达到0.53 mS/cm,已超过作物的生育障碍临界点(EC>0.50 mS/cm)。保护地土壤酸化趋势明显,建成保护地栽培蔬菜6年,土壤pH值从6.50降低至5.50以下,超过了蔬菜出现生理障碍的临界土壤pH5.52。保护地土壤NO3-,SO42-,Cl-和Ca2+,Mg2+,K+,Na+等盐分离子含量均较露地土壤大大增加,但HCO3-则低于露地土壤;保护地土壤pH值的下降与NO3-,SO42-,Cl-的大量积累关系密切,而全盐中Ca2+,Mg2+,Na+相对比例的下降在土壤pH值下降的过程中也起着重要作用。The relationship of soil salinity accumulating and pH was studied by measuring salinity content,ion constitution and pH of the protected field soil in Shenyang of Liaoning province. The results indicated,the salinity content and EC value of protected field soil were much higher than those in the corresponding open field soil. The average of the salinity content was 0.29 g/kg in open field soil and 1.56 g/kg in protected field. Corresponding EC had exceeded the scope of that was 0.53 mS/cm. Soil acidification had take on a clear trend after protected field had been set up,soil pH declined from 6.5 to 5.5 after protected field had been set up for six years. The pH value of 5.52 was a critical point when vegetables appeared physical obstacles. Apart from HCO3^- ,the content of NO3^- ,SC4^2- ,Cl^- ,Ca^2＋ ,Mg^2＋ ,K^＋ ,Na^＋ increased significantly in protected field. The soil pH had a closed relationship to the content of NO3^- ,SO4^2-. It was an important factor that the proportion of Ca^2＋ ,Na^＋ to total salts was decreased which caused soil acidification.

关 键 词：保护地土壤 土壤盐渍化 土壤酸化 

分 类 号：S153.6[农业科学—土壤学]