| 改良剂对根际土壤-水稻系统中镉运移的影响 |
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| 引用本文： | 李义纯,王艳红,唐明灯,巫彬芳,李林峰,艾绍英,凌志祥.改良剂对根际土壤-水稻系统中镉运移的影响[J].环境科学,2019,40(7):3331-3338. |
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| 作者姓名： | 李义纯 王艳红 唐明灯 巫彬芳 李林峰 艾绍英 凌志祥 |
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| 作者单位： | 广东省农业科学院农业资源与环境研究所,广州510640;仲恺农业工程学院环境科学与工程学院,广州510225;农业部南方植物营养与肥料重点实验室,广州 510640;广东省养分资源循环利用与耕地保育重点实验室,广州510640;广东省农业科学院农业资源与环境研究所,广州510640;农业部南方植物营养与肥料重点实验室,广州 510640;广东省养分资源循环利用与耕地保育重点实验室,广州510640;广东省兴宁市合水镇人民政府生态发展服务中心,合水,514546 |
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| 基金项目： | 国家自然科学基金项目（41403104）；广东省自然科学基金项目（2014A030313768，2015A030313567）；广东省应用型科技研发专项（2016B020240009）；广东省农业技术研发项目（2018LM2157） |
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| 摘 要： | 稻田镉(Cd)污染治理是我国目前农田重金属污染治理的重点和难点.铁的氧化还原过程对Cd在土壤-水稻系统中的运移发挥着极其重要的作用.从铁循环调控入手,研发阻控稻米Cd累积的钝化技术及产品,势必能为农田重金属污染治理提供新的解决途径.本研究以自主研发的改良剂为对象,通过野外田间试验,研究改良剂对Cd从根际土壤向根表铁膜迁移及在水稻不同组织器官间转运的影响,探索铁循环影响Cd在根际土壤-水稻系统中运移的机制.结果表明,改良剂施用促进了根际土壤中铁硫化物的形成,其与Cd共沉淀显著减少了分蘖期、拔节期和灌浆期根际土壤中乙酸铵浸提态Cd(NH4AcCd)的含量;成熟期排水烤田致使铁硫化物被氧化,其对Cd的释放显著增大了根际土壤中NH4Ac-Cd的含量;铁硫化物形成减弱了Fe(Ⅱ)从根际土壤向根表的迁移能力,铁膜中铁(DCB-Fe)的含量随之减小,铁膜对Cd的吸附能力减弱导致分蘖期和灌浆期铁膜中Cd(DCB-Cd)的含量显著减小;改良剂施用有效减弱了根系对Cd的转运能力,增大了拔节期、灌浆期和成熟期Cd在根系的分布比例,而减少了拔节期、灌浆期和成熟期Cd在茎叶、以及成熟期Cd在糙米中的分布比例.本研究成果将为后期改良剂的研发及应用提供理论依据,对解决稻田Cd污染治理难题具有重要意义.
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| 关 键 词： | 改良剂 铁循环 镉(Cd) 根际土壤 水稻 |
| 收稿时间： | 2018/11/2 0:00:00 |
| 修稿时间： | 2019/1/27 0:00:00 |
Effects of an Amendment on Cadmium Transportation in the Rhizosphere Soil-Rice System |
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| LI Yi-chun,WANG Yan-hong,TANG Ming-deng,WU Bin-fang,LI Lin-feng,AI Shao-ying and LING Zhi-xiang.Effects of an Amendment on Cadmium Transportation in the Rhizosphere Soil-Rice System[J].Chinese Journal of Environmental Science,2019,40(7):3331-3338. |
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| Authors: | LI Yi-chun WANG Yan-hong TANG Ming-deng WU Bin-fang LI Lin-feng AI Shao-ying and LING Zhi-xiang |
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| Institution: | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;College of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China;Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China;Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China,Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China;Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China,Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China;Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China,Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China;Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China,Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China;Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China,Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China;Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China and Ecological Development Service Center, People''s Government of Heshui Town, Xingning City, Guangdong Province, Heshui 514546, China |
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| Abstract: | |
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| Keywords: | amendment iron (Fe) redox cycle cadmium (Cd) rhizosphere soil rice |
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