摘要
采集宁夏掌政五渡桥和永宁地区大棚及对照土壤,离子色谱法测定土壤中Cl-、NO2-、NO3-、SO42-、PO43-、Na+、K+、Mg2+、Ca2+含量,分析各地区设施土壤中盐分含量变化特点。结果表明,掌政五渡桥和永宁地区大棚土壤盐含量均高于未耕作的大棚土壤,不同地区盐分含量变化幅度大。随耕作年限延长,盐分的不断累积已造成部分大棚出现轻度次生盐渍化;掌政五渡桥地区随着种植年限延长水溶性盐总量呈现上升趋势,以Na+、Ca2+、NO3-和SO42-含量变化幅度最大,永宁地区在种植4a左右盐分累计达到最高,之后出现降低的趋势,各离子含量随种植年限延长出现先增加后下降趋势;盐分离子在土壤剖面的运移同时存在着明显的向底层迁移和向表层聚集2种方式,但以表聚为主;设施栽培后,土壤中的Cl-、NO3-、SO42-、Na+、Ca2+均有不同程度的累计,阴离子以NO3-和SO42-为主,阳离子以Ca2+为主。Cl-、SO42-、Na+和Ca2+是造成土壤次生盐渍化的主要离子。
Salt composition and content changes of green house soil were studied by investigating greenhouse cultivation in Zhangzheng Wuduqiao and Yongning region of Ningxia. Soil samples were collected andCl-, NO2 , NO3-, SO42-, PO43-, Na＋, K＋, Mg2＋ and Ca2＋ were analyzed by ion chromatography. The results indicated： The salt content of greenhouse soil was higher than that in control soil samples. Accumulated with the farming years, salt has caused mild secondary salinization in some greenhouses. With the increase of planting years, the total amount of water--soluble salts o- verall upward trend in Zhangzheng Wuduqiao area. In Yongning region, the content of water--soluble salts reached the highest level after four years cultivation, and then decreased. Ion content was firstly increasing with the planting years, and then decreasing. The movement of salt in greenhouse soil pro- files displayed apparent ways of salt accumulation in topsoil and salt leaching downwards to the bot- tom of the soil, mainly accumulated in topsoil. The contents of C1 , NO3 , 8042 , Na＋ , Ca2＋ were increased to different degree in greenhouse soil. NO3-and SO42- are major anions and Ca2＋ is the ma jor cation in the soil. Soil secondary salinization was caused mainly by C1 , SO42 , Na＋and Ca2＋.
出处
《西北农业学报》
CAS
CSCD
北大核心
2014年第1期201-206,共6页
Acta Agriculturae Boreali-occidentalis Sinica
基金
宁夏回族自治区自然基金项目(NZ1074)
关键词
设施土壤
离子组成
盐分含量
土壤盐渍化
Greenhouse soil
Ion composition
Salt content
Soil salinization
