| 1株肠杆菌与硫肥联合施用对水稻积累镉砷的影响 |
| 摘要点击 986 全文点击 302 投稿时间：2022-11-09 修订日期：2023-02-20 |
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| 中文关键词 镉(Cd) 砷(As) 水稻 硫肥 硫酸盐还原 根表铁膜 |
| 英文关键词 cadmium(Cd) arsenic(As) rice sulfur fertilizer sulfate reduction iron plaque |
| 作者 | 单位 | E-mail | | 张朴心 | 湖南农业大学资源环境学院, 长沙 410128
湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128
农业农村部南方产地污染防控重点实验室, 长沙 410128 | push850393788@163.com | | 姚俊帆 | 湖南农业大学资源环境学院, 长沙 410128
湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128
农业农村部南方产地污染防控重点实验室, 长沙 410128 | | | 刘玉玲 | 湖南农业大学资源环境学院, 长沙 410128
湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128
农业农村部南方产地污染防控重点实验室, 长沙 410128 | | | 张威宇 | 湖南农业大学资源环境学院, 长沙 410128
湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128
农业农村部南方产地污染防控重点实验室, 长沙 410128 | | | 尹雪斐 | 湖南农业大学资源环境学院, 长沙 410128
湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128
农业农村部南方产地污染防控重点实验室, 长沙 410128 | | | 铁柏清 | 湖南农业大学资源环境学院, 长沙 410128
湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128
农业农村部南方产地污染防控重点实验室, 长沙 410128 | tiebq@qq.com |
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| 中文摘要 |
| 为探究不同硫肥联合硫酸盐还原菌在长期淹水条件下对水稻积累镉（Cd）和砷（As），以及对根表铁膜形成的影响，为中轻度Cd-As复合污染稻田安全生产提供参考.采用盆栽试验的方法，选取了硫磺和硫酸钙两种硫肥及具有硫酸盐还原能力的肠杆菌M5，设计单一施用及不同硫肥与菌株联合施用共6个处理.结果显示，同时基施硫酸钙和菌株的处理（CM5）降低水稻根际土中有效态Cd和As的效果均最好.淹水条件下基施硫肥或菌株会使早稻籽粒中Cd含量降低8%~51%，无机As含量降低42%~61%；使晚稻籽粒中Cd含量降低81%~92%，无机As含量降低41%~62%.其中，同时基施硫磺和菌株的处理（SM5）和CM5处理降低早、晚稻籽粒中Cd、As含量效果均最佳.SM5处理和CM5处理能促进水稻根表铁膜对Cd、As的吸附，二者ACA提取态Cd和As含量较CK显著增加，且CM5处理ACA提取态铁含量较CK也显著增加，说明同时基施硫酸钙和菌株会促进水稻根表铁膜的形成.结果表明，硫肥和菌株联合施用相较单一施用降低籽粒中Cd、As含量的效果更好，而同时基施硫酸钙和菌株是效果最佳且最为稳定的方法. |
| 英文摘要 |
| The aim of this study was to explore the effects of different sulfur fertilizers combined with sulfate-reducing bacteria on the accumulation of cadmium and arsenic in rice and the formation of iron plaque under long-term flooding conditions and to provide a reference for the safe production of rice fields polluted by moderate and mild cadmium and arsenic. We adopted a pot experiment, selecting two sulfur fertilizers, sulfur and calcium sulfate, and Enterobacter M5 with sulfate-reducing ability, and designed six treatments of single application and combined application of different sulfur fertilizers and M5. The results showed that the combined application of calcium sulfate and M5(CM5) had the best effect on reducing available cadmium and arsenic in rice rhizosphere soil. The combined application of sulfur fertilizer or M5 could reduce the content of cadmium and inorganic arsenic in early season rice grains by 8%-51% and 42%-61%, respectively, under flooding conditions. The content of cadmium and inorganic arsenic in late rice grains decreased by 81%-92% and 41%-62%, respectively. The treatment of the combined application of sulfur and M5(SM5) and CM5 had the best effect on reducing cadmium and arsenic content in both early and late season rice grains. SM5 and CM5 could promote the adsorption of cadmium and arsenic by iron plaque, and the extracted cadmium and arsenic content of ACA in both treatments was significantly higher than that of CK. The extracted iron content of ACA in the CM5 treatment was also significantly higher than that of CK, which indicates that the combined application of calcium sulfate and M5 would promote the formation of iron plaque. The results showed that the combined application of sulfur fertilizer and M5 was better than single application in reducing the content of cadmium and arsenic in grains, whereas the combined application of calcium sulfate and M5 was the best and most stable method. |
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