| 不同水分管理模式联合叶面喷施硅肥对水稻Cd累积的影响 |
| 摘要点击 1658 全文点击 553 投稿时间：2020-02-21 修订日期：2020-03-10 |
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| 中文关键词 水稻 水分管理 Cd污染土壤 硅肥 组合技术措施 |
| 英文关键词 rice water management Cd contamination soil silicon fertilizer combined treatment |
| 作者 | 单位 | E-mail | | 魏宾纭 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | 1572311210@qq.com | | 周航 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | zhouhang4607@163.com | | 刘佳炜 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 张竞颐 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 黄芳 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 霍洋 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 胡雨丹 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 辜娇峰 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | gujiaofeng@163.com | | 刘俊 | 有色金属矿区耕地重金属污染生态阻抗技术研究衡阳市重点实验室, 衡阳 421001 | | | 廖柏寒 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | |
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| 中文摘要 |
| 在某重度Cd污染稻田（Cd含量2.83 mg·kg-1）开展8种水分管理措施联合叶面喷施硅肥的大田试验，研究不同处理对水稻生长及各部位Cd累积的影响.结果表明：① 8种水分管理措施联合叶面喷施硅肥处理对水稻株高和分蘖数没有明显影响，但各处理均增加了水稻糙米生物量，增幅为1.7%～25.0%，其中成熟期淹水+叶面喷施硅肥处理（CY）下糙米生物量达到最高.②常规水分管理+叶面喷施硅肥处理（Si）对土壤Cd两种提取态含量无明显影响，而其他处理降低土壤交换态Cd含量7.8%～42.6%，降低土壤TCLP提取态Cd含量20.0%～40.8%.③常规水分管理+叶面喷施硅肥处理（Si）能降低水稻各部位Cd含量，糙米Cd含量下降了19.0%；其他处理显著降低了水稻各部位中Cd含量，其中仅成熟期湿润+叶面喷施硅肥处理（CS）降低糙米Cd含量降幅最大，降低了44.0%，其次为间歇淹水湿润+叶面喷施硅肥处理（JX）和仅灌浆期湿润+叶面喷施硅肥处理（GS），分别降低36.4%和31.8%.④在中重度Cd污染稻田建议采用仅成熟期湿润+叶面喷施硅肥处理（CS）和间歇淹水湿润+叶面喷施硅肥处理（JX），在不影响水稻产量的同时又显著降低糙米Cd含量. |
| 英文摘要 |
| A field experiment involving eight treatments with water management combined with leaf spraying silicon fertilizer was conducted in a paddy field heavily contaminated with Cd (2.83 mg·kg-1) to study the effects of these treatments on rice growth and Cd accumulation in different rice tissues. The results showed that:① the treatments had no significant effects on rice plant height or number of tillers, but increased the biomass of brown rice by 1.7% to 25.0%. Among the eight treatments, that of water flooding during the rice maturation period plus leaf spraying silicon fertilizer (CY) resulted in the highest amount of brown rice yield. ② The treatment of conventional water management plus leaf spraying silicon fertilizer (Si) had no significant effect on the exchangeable Cd content and TCLP extractable Cd content in soil, whereas the other treatments reduced the exchangeable Cd content by 7.8%-42.6% and the TCLP extractable Cd content by 20.0%-40.8%. ③ The Si treatment could reduce the Cd content in various rice tissues, with an overall decrease of 19.0% in brown rice. The other treatments significantly reduced the Cd content in various rice tissues. The treatment of moisture during the rice maturation period plus leaf spraying silicon fertilizer (CS) resulted in the highest reduction in the Cd content in brown rice (44.0%), and was followed by the treatments of batch-type water flooding during the entire rice growth period plus leaf spraying silicon fertilizer (JX; 36.4%), and moisture during the rice pustulation period plus leaf spraying silicon fertilizer (GS; 31.8%). ④ For paddy-fields that are contaminated with Cd to medium and heavy levels, the CS and JX treatments are recommended to manage rice production in order to significantly reduce the Cd content of brown rice whilst having little effect on the rice yield. |
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