中国水土保持科学2017，Vol.15Issue(2)：43-50,8.DOI:10.16843/j.sswc.2017.02.006
不同潜水埋深下浅层土壤的水盐分布特征
Water and salt distribution characteristics of shallow soil at different diving water levels
摘要
Abstract
[Background] Water and salt distribution of shallow soil are the main affecting factors of seedling growth.Taking soil columns planted with Tamarix chinensis Lour.(3-year-old),a constructive species in the Yellow River Delta as the research object,we aimed at studying how the diving water level (DWL) affects the water and salt distribution.[Methods] The experiment was carried out as such,first,planting the T.chinensis Lour.to soil column in the greenhouse,configuring the salt water in which mineralization degree was 6 grams per liter with sea salt,then setting up 6 diving water levels of 0.3 m,0.6 m,0.9m,1.2m,1.5m,and1.8m,and each level set 3 repeats.In the use of drying method and residue drying method,the relative water content (RWC),salt content and absolute concentration at soil depths of 0-10 cm and 10-20 cm in a simulated device with DWL of 0.3 m,0.6 m,0.9 m,1.2 m,1.5 m and 1.8 m were measured.[Results] The RWC in 10-20 cm was higher than that in 0-10 cm and decreased significantly with the DWL increased (0-20 cm),but the decreasing degree in 0-10 cm was much higher than that in 10-20 cm,the highest reduction of the RWC was at both 1.2 m and 1.5 m.The salt content (0-10 cm) increased at first and then decreased with the DWL increasing,reached peak at 1.2 m (1.38％) and increased byl06.35％ compared with that at 0.3 m.The salt content (10-20 cm) was complex with the DWL changing,it changed smoothly at 0.3-0.9 m and increased at 1.2 m then decreased at 1.5-1.8 m,reached maximum at 1.2 m (1.33％) and increased by 304.04％ compared with 0.3 m.The absolute concentration (0-10 cm) exponentially increased with the DWL increasing and maximum at 1.2 m (17.12％).The absolute concentration (10-20 cm) increased at first and then decreased with the DWL increasing and was maximal at 1.2 m (10.10％).[Conclusions] The RWC was significantly negative with the DWL (P ＜ 0.01) while significantly positive for the salt level (P ＜ 0.05);the absolute concentration (0-10 cm) was significantly positive with the DWL (P ＜ 0.01) but significantly negative with the DWL (P ＜ 0.01),the absolute concentration (10-20 cm) was significantly positive with the salt level (P ＜ 0.01).This study provides theoretical basis and technical reference for the prevention of soil salinization in the Yellow River Delta and the planting management of T.chinensis Lour.关键词
潜水水位/土壤水分/土壤盐分/土壤溶液绝对浓度/分布特征/柽柳Key words
diving water level/soil moisture/soil salinity/absolute concentration of soil/distribution characteristic/Tamarix chinensis Lour分类
农业科技引用本文复制引用
李小倩,夏江宝,赵西梅,杨吉华..不同潜水埋深下浅层土壤的水盐分布特征[J].中国水土保持科学,2017,15(2):43-50,8.基金项目
国家自然基金面上项目“黄河三角洲柽柳对水位-盐分变化的生理生态响应过程与机制”(31370702) （31370702）
山东省重点研发计划项目“黄河三角洲盐碱地农田林网生态工程治理及配套生物修复技术研究与示范”(2015GNC111022) （2015GNC111022）
