不同水分条件下硒对水稻镉吸收与转运的影响  

Effect of Selenium on Cadmium Uptake and Transfer in Rice Plant Under Different Water Management

作　　者：管远清 李无双[1] 殷行行 丁永祯[1,2] 冯人伟 王瑞刚[1,2] 周莉 Guan Yuanqing;Li Wushuang;Yin Xingxing;Ding Yongzhen;Feng Renwei;Wang Ruigang;Zhou Li(Agro-Environmental Protection Institute,Ministry of Agriculture,Tianjin 300191,China;Key Laboratory of Original Agro-Environmental Pollution Prevention and Control,Ministry of Agriculture,Tianjin 300191,China)

机构地区：[1]农业部环境保护科研监测所,天津300191 [2]农业部产地环境污染防控重点实验室,天津300191

出　　处：《天津大学学报（自然科学与工程技术版）》2018年第12期1309-1315,共7页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(41471274);国家科技支撑计划资助项目(2015BAL01B01)~~

摘　　要：镉(Cd)污染是我国面临的主要环境问题之一.通过盆栽试验,研究了常规灌溉和湿润灌溉下土施0、1.0、5.0,mg/kg的Na2SeO3 [Se(Ⅳ)]和Na2SeO4[Se(Ⅵ)]对水稻镉吸收与转运的影响.结果显示,相对于湿润灌溉,常规灌溉可显著提高秸秆鲜重和籽粒产量,显著降低根、茎、籽粒中的Cd含量,降低茎/根、糙米/茎、糙米/叶的Cd转运系数,提高叶/根、叶/茎转运系数.硒(Se)抑制了Cd从根部向地上部转运,显著降低了地上部的Cd含量,湿润、常规灌溉下,效果最好的分别为5.0,mg/kg的Se(Ⅵ)和1.0,mg/kg的Se(Ⅳ).湿润灌溉下,Se降低了叶/茎转运系数,增加了糙米/茎、糙米/叶转运系数;常规灌溉下,低浓度Se(Ⅳ)显著增加了叶/茎转运系数,降低了糙米/叶转运系数.研究表明,常规灌溉联合低浓度Se(Ⅳ)处理对降低籽粒Cd含量具有最大的协同作用.Cadmium(Cd)pollution is one of the major environmental problems in China.Pot experiments were conducted to study the effects of selenite(Na2SeO3)and selenate(Na2SeO4)at different doses of 0,1.0 and 5.0,mg/kg on Cd uptake and transport in rice plant subjected to normal and humid irrigation.The results showed that,when compared with humid irrigation,normal irrigation significantly increased the fresh straw weight and grain quality of rice plant,and dramatically reduced the Cd content in the root,stem,and grain of rice plant.Normal irrigation also significantly decreased the Cd transfer coefficient of root to stem,stem to grain and leaf to grain,but increased the coefficient of root to leaf and stem to leaf.Se addition significantly inhibited the Cd transfer from roots to shoots,and reduced the Cd content in shoots.The addition of 5.0,mg/kg Se(Ⅵ)under humid irrigation and the addition of 1.0,mg/kg Se(Ⅳ)under normal irrigation showed best performance in inhibiting the uptake and transfer of Cd respectively.Se addition decreased the Cd transfer coefficient of stem to leaf,but increased that of stem to grain and leaf to grain under humid irrigation.Se(Ⅳ)with the concentration of 1.0 mg/kg increased the Cd transfer coefficient of stem to leaf,but decreased that of stem to grain under normal irrigation.The study showed that normal irrigation combined with 1.0,mg/kg Se(Ⅳ)performed the best in reducing Cd content of grain.

关 键 词：水稻 镉 硒 水分管理 转运系数 

分 类 号：X53[环境科学与工程—环境工程]