摘要
组配改良剂在镉(Cd)污染稻田上可降低水稻对Cd的积累,从而提高农产品安全水平.本文通过田间试验,研究了组配改良剂SF(海泡石与铁锰矿粉质量比5:1)在不同施用量(562.5,1125和2250kg/hm^(2))下对稻田土壤Cd有效性、根表胶膜形成以及水稻吸收积累Cd的影响.结果表明,施用SF对土壤有效态Cd和Fe含量无显著影响,提高了有效态Mn和交换性Mg含量.与CK相比,SF处理水稻根表胶膜Fe和Mn含量分别提高6.9%~22.1%和15.6%~84.4%,根表胶膜Cd含量降低25.8%~37.3%(p<0.05).SF处理根对Cd的吸收显著降低25.3%~50.2%(p<0.05),稻米Cd含量显著降低35.9%~45.3%(p<0.05).稻米Cd含量与根Cd和根表胶膜Cd含量均显著正相关(p<0.05).组配改良剂SF通过降低水稻根表胶膜对Cd的吸附和根对Cd的吸收,从而显著降低稻米Cd含量.
The application of combined amendment in cadmium(Cd)-contaminated paddy soil can reduce the accumulation of Cd in rice grain,thus improving the safety level of agricultural products.In the present study,we conducted a plot experiment to examine the effect of the combined amendment of SF(the mass ratio of sepiolite to ferromanganese ore powder is 5:1)on soil Cd availability,the concentration of Cd in Fe-Mn plaque in roots,and the uptake and accumulation of Cd in rice plants under different application rates(562.5,1125 and 2250kg/hm^(2)).The results showed that the application of SF had no significant effect on the concentration of available Cd and Fe in the soil,but increased the concentration of available Mn and exchange Mg.Compared with CK,the concentrations of Fe and Mn in Fe-Mn plaque in roots of SF treatments increased by 6.9%~22.1%and 15.6%~84.4%,respectively,and the concentrations of Cd in Fe-Mn plaque in roots significantly decreased by 25.8%~37.3%(p<0.05).The concentrations of Cd in roots treated with SF were significantly reduced by 25.3%~50.2%(p<0.05),and the Cd concentrations in rice grains were significantly reduced by 35.9%~45.3%(p<0.05).The Cd concentrations in rice grain was positively correlated with the Cd concentrations in root and Fe-Mn plaque(p<0.05).The application of the combined amendment of SF significantly reduced the Cd concentrations in rice grains by reducing the adsorption of Cd by Fe-Mn plaque and the uptake of Cd by rice roots.
作者
马梦雪
王中元
许超
王华静
张泉
黄道友
朱奇宏
朱捍华
MA Meng-xue;WANG Zhong-yuan;XU Chao;WANG Hua-jing;ZHANG Quan;HUANG Dao-you;ZHU Qi-hong;ZHU Han-hua(College of Geography and Resource Science,Sichuan Normal University,Chengdu 610101,China;Key Laboratory for Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha Agricultural Environment Observation and Research Station,Chinese Academy of Sciences,Changsha 410125,China)
出处
《中国环境科学》
CSCD
北大核心
2023年第S1期205-212,共8页
China Environmental Science
基金
国家自然科学基金资助项目(42177025,42077374)
国家重点研发计划课题(2019YFC1803602)
湖南省技术攻关“揭榜挂帅”项目(2021NK1040)
湖南省高新技术产业科技创新引领计划项目(2020NK2001)
关键词
组配改良剂
重金属
镉有效性
根表胶膜
水稻
combined amendment
heavy metal
cadmium availability
Fe-Mn plaque
rice
