摘要
测定了沪郊不同年限设施菜地土壤盐分含量、离子组成和土壤pH,同时分析了土壤NO_3^-含量、总盐量与各类盐分离子的相关关系。结果表明:(1)设施2年及以上大棚土壤的盐分含量、电导率均显著高于1年大棚,除HCO_3^-离子外,其他7种离子含量均显著提高;(2)设施菜地有酸化趋势,建成保护地蔬菜6年及以上,土壤pH降至6.38,达到弱酸水平;(3)随设施年限的增加,设施菜地NO_3^-、Cl^-、K^+、Mg^(2+)等离子在全盐中的相对比例上升,SO_4^(2-)、HCO_3^-则相对下降,Ca^(2+)、Na^+变化不明显;(4)相关性分析表明,除HCO_3^-外,硝态氮含量、全盐量、电导率与各离子含量均呈显著正相关。
The salt content,ionic composition and pH of soil in different-age vegetable fields under structure were determined in Shanghai suburbs,and the correlations between the NO_3^- and total salt contents of soil and the ionic concentrations of different salts were analyzed.The results indicated that （1） the salt content and electric conductivity（EC） of soil in plastic tunnels after 2 years or more were significantly higher than those in one-year-old plastic tunnels,and except HCO_3^-,7 major ionic concentrations increased significantly;（2） Vegetable fields under structure took on a clear trend of soil acidification, and their soil pH declined to 6.38 after 6 years or more;（3） With time,ratios of NO_3^-. Cl^-,K~＋and Mg^（2＋）to total salt increased but ratios of SO_4^（2-）and HCO_3^- to total salt decreased,while Ca^（2＋）and Na~＋changed little;（4） There were significant positive correlations between nitrate nitrogen content,total salt,EC and contents of major ions except HCO_3^-.
出处
《上海农业学报》
CSCD
北大核心
2011年第4期76-79,共4页
Acta Agriculturae Shanghai
基金
上海市科技兴农推广项目[沪农科推字(2009)第1-2号]资助
关键词
保护地栽培
设施菜地
盐分积累
离子组成
Protected culture
Vegetable field under structure
Salt accumulation
Ionic composition
