摘要
在江苏省泰州市基于黄瓜种植(种植的黄瓜品种为东方明珠)的设施菜地中进行了硝酸盐型土壤次生盐渍化的分级研究。供试土壤经过不同浓度的硝酸盐处理对应形成不同程度的次生盐渍化。用土壤电导率(EC)标示次生盐渍化的等级,经测定,对照及处理的EC分别为:对照(CK)0.89 dS m-1,处理1(T1)2.78 dS m-1,处理2(T2)3.65 dS m-1,处理3(T3)4.66 dS m-1,处理4(T4)6.15 dS m-1。统计结果表明,表层土壤(0～10 cm)硝酸盐含量与土壤EC之间呈显著正相关关系。表明由硝酸盐引起的不同程度的土壤次生盐渍化即硝酸盐型次生盐渍化的分级可以通过土壤电导率来标示。实验表明,不同程度的硝酸盐型次生盐渍化显著影响黄瓜的株高和产量(p<0.05)。根据不同程度的次生盐渍化土壤对黄瓜株高和产量的影响,对长江三角洲地区基于黄瓜种植的设施菜地土壤硝酸盐型次生盐渍化进行了初步分级,即等级Ⅰ:EC<2.03 dS m-1,等级Ⅱ:2.03 dS m-1<EC<3.76 dS m-1,等级Ⅲ:3.76 dS m-1<EC<5.32 dS m-1,等级Ⅳ:5.32 dS m-1<EC<6.15 dS m-1,等级Ⅴ:EC>6.15 dS m-1。
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^-1 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, levellI： 2. 03 dS m^-1 〈 EC〈3.76 dS m^-1, levellU： 3.76 dSm^-1 〈EC〈5.32 dS m^-1, level IV： 5.32 dS m^-1 〈 EC〈 6.15 dS m^-1, level V： EC〉6.15 dS m^-1）.
出处
《土壤学报》
CAS
CSCD
北大核心
2012年第4期673-680,共8页
Acta Pedologica Sinica
基金
农业科学研究公益项目(200903011)资助
关键词
黄瓜
设施菜地
硝酸盐
土壤次生盐渍化
分级
Classification
Greenhouse
NO3-
Soil secondary salinization （SSS）
Cucumber （ Cucumis sativus L. ）
