摘要
在建立饱和及土水比1∶5(m∶v)条件下EC e与EC1∶5相关关系的基础上,建立EC1∶5的土壤盐分分级指标,评价了传统管理条件下设施越冬长茬和春茬的土壤盐分动态。结果表明:设施菜田土壤EC e与EC1∶5呈极显著正相关,在京郊土壤条件下换算公式为EC1∶5=0.105 EC e;果类蔬菜中茄子和辣椒属敏感蔬菜作物,苗期和全生育期耐盐性根层土壤EC1∶5临界值分别为0.10 dS·m -1和0.30 dS·m -1,当季根层土壤EC1∶5可接受调控范围为0.30～0.50 dS·m -1;番茄和黄瓜属非敏感蔬菜作物,苗期和全生育期耐盐性根层土壤EC1∶5临界值分别为0.30 dS·m -1和0.60 dS·m -1,当季根层土壤EC1∶5可接受调控范围为0.60～0.90 dS·m -1;日光温室越冬长茬土壤EC1∶5均值从定植至翌年3月一直稳定在0.30～0.34 dS·m -1之间,之后逐渐下降,7月降至0.15 dS·m -1;塑料大棚春茬定植后根层土壤EC1∶5逐渐下降,4月之前为0.29～0.30 dS·m -1,7月降至0.20 dS·m -1;结合蔬菜作物耐盐指标发现,传统管理条件下日光温室越冬长茬和塑料大棚春茬蔬菜作物在苗期易出现盐害问题;越冬长茬敏感蔬菜作物从定植至翌年3月期间,土壤盐度易超过其耐盐临界值,需要合理水肥调控以防盐害。
Abstract： The electrical conductivity （ EC ） of different extracts （, saturated extract and 1 ： 3 ot soil and water ratio extract ） were tested, and the relationship between ECo and EC1 ： 5 was established in this study. Therefore, the soil standardized classification of EC1 ： 5 was also established. Besides, the study evaluated the soil salinity dynamic of overwinter and spring facility vegetables under conventional management. The results indicated that the soil EC and ECl： 5 of facility vegetable fields showed significant and positive correlated linear relationship. Under the soil conditions at Beijing suburbs the reduction formula was EC1：5 =0.105 EC. The critical value of soil ECe at salt tolerant root layer for sensitive fruity vegetables （ eggplant and pepper ） during seedling stage and the whole growing period were 0.10 dS. m-1 and 0.30 dS . m-1, respectively. And the adjustable value was between 0.30 dSm-1 and 0.50 dS . m-1. For non-sensitive vegetables （tomato and cucumber ） the critical value of soil EC1 ： 5 at salt tolerant root layer during seedling stage and the whole growing period were 0.30 dS.m-1 and 0.60 dS. m-1, respectively. And the adjustable value was between 0.60 dS. m-1 and 0.90March, the soil salinity was inclined to exceed its critical value of salt tolerance. Reasonable adjustment between water and fertilizer was needed so as to control the salt damage.
出处
《中国蔬菜》
北大核心
2014年第2期15-20,共6页
China Vegetables
基金
国家公益性行业(农业)科研专项(201103003)
现代农业产业技术体系北京市果类蔬菜创新团队项目
