土壤学报2012，Vol.49Issue(4)：673-680,8.
基于黄瓜种植的设施菜地土壤硝酸盐型次生盐渍化的分级研究
THE CLASSIFICATION STUDY ON NO3——SOIL SECONDARY SALINIZATION IN CUCUMBER-BASED GREENHOUSE
摘要
Abstract
In China, nitrogen fertilizer application rates in intensive agricultural systems have increased dramatically in recent years, especially in protected vegetable production systems. This excessive use of nitrogen fertilizer has resulted in soil secondary salinization ( SSS) , which has become a significant environmental stress for crops such as cucumber, in the protected farmland of China. So it is necessary to propose some guidelines to direct the management of SSS in facility agricultural areas. In this study, the NO3--SSS classification was studied in greenhouses planted with cucumber (Cucumis sativus L. cv. Dongfangmingzhu) in Taizhou, Jiangsu Province, East China. After the soils in these greenhouses were treated by different concentrations of nitrate, the SSS levels expressed by electrical conductivity (EC) were studied at 0. 89 dS m~1 for control, 2. 78 dS m-1 for treatment 1 (T1) , 3. 65 dS m-1 for treatment 2 (T2) , 4. 66 dS m-1 for treatment 3 (T3) and 6. 15 dS m for treatment 4 (T4). The results showed that there were significant relationships between NO3- contents and soil EC in the surface soils, implying that the change in soil quality resulted from the difference of nitrate contents could be expressed by the level of the NO3--SSS. The level of the NO3--SSS was significantly related with the cucumber height and yield (p <0. 05). Then, the classification for NO3- -SSS in cucumber-based greenhouse in Yangtze River Delta was identified as five levels according to the effects of SSS on the cucumber height and yield (level I: EC <2. 03 dS m-1, level Ⅱ: 2.03 dS m-1 < EC <3.76 dS m-1, level Ⅲ 3.76 dS m-1 < EC <5.32 dS m-1, levelⅣ: 5.32 dS m-1 < EC < 6.15 dS m-1, level Ⅴ: EC >6. 15 dS m-1).关键词
黄瓜/设施菜地/硝酸盐/土壤次生盐渍化/分级Key words
Classification/ Greenhouse/ NO3- / Soil secondary salinization (SSS) / Cucumber (Cucumis sativus L. )分类
农业科技引用本文复制引用
张金锦,段增强,李汛..基于黄瓜种植的设施菜地土壤硝酸盐型次生盐渍化的分级研究[J].土壤学报,2012,49(4):673-680,8.基金项目
农业科学研究公益项目(200903011)资助 （200903011）
