| 刘颖,苏广权,郭湘,杨燕花,姚爱军,仇荣亮,汤叶涛.不同形态硫对水稻吸收积累镉的影响[J].农业环境科学学报,2021,40(6):1208-1218. |
| 不同形态硫对水稻吸收积累镉的影响 |
| Effects of different sulfur forms on cadmium uptake and accumulation in paddy rice |
| 投稿时间：2020-10-09 |
| DOI：10.11654/jaes.2020-1164 |
| 中文关键词: 水稻 S形态 K2SO4 K2S 镉 |
| 英文关键词: paddy rice sulfur form K2SO4 K2S cadmium |
| 基金项目:国家重点研发计划项目（2018YFD0800700）；国家自然科学基金项目（41877121） |
| 作者 | 单位 | E-mail | | 刘颖 | 中山大学地理科学与规划学院, 广州 510275 | | | 苏广权 | 中山大学地理科学与规划学院, 广州 510275 | | | 郭湘 | 中山大学地理科学与规划学院, 广州 510275 | | | 杨燕花 | 中山大学环境科学与工程学院, 广州 510275
中山大学广东省环境污染控制与修复重点实验室, 广州 510275 | | | 姚爱军 | 中山大学地理科学与规划学院, 广州 510275 | yaoaijun@mail.sysu.edu.cn | | 仇荣亮 | 中山大学环境科学与工程学院, 广州 510275
中山大学广东省环境污染控制与修复重点实验室, 广州 510275
岭南现代农业科学与技术广东省实验室, 华南农业大学, 广州 510642 | | | 汤叶涛 | 中山大学环境科学与工程学院, 广州 510275
中山大学广东省环境污染控制与修复重点实验室, 广州 510275 | |
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| 中文摘要: |
| 为探究不同形态硫素（SO42-/S2-）对水稻生物量和糙米Cd积累的影响，采用金属矿区下游Cd、As重度污染农田耕层土壤，以温室水稻盆栽试验，在施用足量CaCO3条件下，向供试土壤中分别施加0（CK）、400 mg S·kg-1（K2S/K2SO4）并持续淹水直至收获。结果表明：与CK相比，K2S和K2SO4处理显著提高水稻总生物量130.1%~186.7%，且K2S处理增加糙米产量效果更佳。与CK相比，施加S素能显著降低糙米Cd含量，K2S处理使糙米Cd含量降低37.5%~50.0%，K2SO4处理降低31.3%~45.0%。两种施S处理均使糙米Fe含量下降90%以上。K2S和K2SO4处理使土壤溶液pH平均降低0.28~0.32个单位，K2S处理可显著促进土壤Cd向铁锰氧化物结合态和有机硫化物结合态Cd转化，铁锰氧化物结合态Cd在酸化和氧化环境下相对稳定，有利于稳定土壤Cd活性；K2S处理同时增加茎、叶的S含量，有效将Cd液泡区隔化，将Cd固定在茎、叶，从而降低糙米Cd含量。K2SO4处理促进土壤Cd向碳酸盐结合态和有机硫化物结合态转化，在土壤酸化和Eh回升条件下，K2SO4处理土壤有效态Cd显著提高。但K2SO4处理比K2S处理更有利于Cd在植物体内的液泡区隔化，这可能是其能够抑制Cd从根向地上部及籽粒转运的原因。研究表明，在施用足量CaCO3条件下，足量施用K2S或K2SO4均可提高水稻生物量，并有效降低糙米Cd含量。 |
| 英文摘要: |
| To explore the effects of different forms of sulfur（SO42-/S2-）on rice biomass and Cd accumulation in brown rice， pot experiments were performed by adding 0（CK）or 400 mg S·kg-1（K2S/K2SO4）to farmland soil heavily contaminated with Cd and As. Soil samples were collected downstream from a metal mine in Guangdong Province. All tested soil samples were neutralized by CaCO3 under continuous flooding conditions. Compared to CK， K2S and K2SO4 treatments significantly increased total rice biomass by 130.1%~186.7%， but K2S treatment resulted in a greater increase in brown rice yield. The Cd content of brown rice was reduced by 37.5%~50.0% after K2S treatment and by 31.3%~45.0% after K2SO4 treatment. The Fe content of brown rice in both sulfur treatment groups also decreased by over 90%. K2S treatment inhibited the availability of Cd in the soil by promoting its transformation into Fe /Mn-oxide-bound and organic-sulfide-bound forms of Cd. Moreover， K2S treatment increased the S content of stems and leaves， which effectively sequestrated Cd into the vacuoles of stems and leaves， thus helping to reduce Cd translocation to the rice grain. Due to the increase in carbonate-bound and organic-sulfide-bound Cd formation， the amount of Cd available in the soil increased significantly after K2SO4 treatment under soil acidification and elevated reduction potential conditions. However， K2SO4 treatment was more effective than K2S treatment at sequestrating Cd into the vacuoles， which helped to limit Cd translocation to the shoot and grain. These results show that， after the adequate application of CaCO3， both tested sulfur forms， at their full dose， effectively reduce Cd content in brown rice and increase rice yield. |
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