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水分管理和外源硒对水稻吸收累积铅的影响
摘要点击 229  全文点击 61  投稿时间:2018-01-25  修订日期:2018-04-03
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中文关键词    水稻  水分管理  亚硒酸盐  吸收  累积
英文关键词  lead  rice  water management  selenite  uptake  accumulation
作者单位E-mail
万亚男 中国农业大学资源与环境学院, 农田土壤污染防控与修复北京市重点实验室, 北京 100193 2549354538@qq.com 
刘哲 中国农业大学资源与环境学院, 农田土壤污染防控与修复北京市重点实验室, 北京 100193  
Aboubacar Younoussa Camara 中国农业大学资源与环境学院, 农田土壤污染防控与修复北京市重点实验室, 北京 100193  
余垚 中国农业大学资源与环境学院, 农田土壤污染防控与修复北京市重点实验室, 北京 100193  
王琪 中国农业大学资源与环境学院, 农田土壤污染防控与修复北京市重点实验室, 北京 100193  
李花粉 中国农业大学资源与环境学院, 农田土壤污染防控与修复北京市重点实验室, 北京 100193 lihuafen@cau.edu.cn 
中文摘要
      通过盆栽试验,研究了不同水分管理和外源亚硒酸盐的添加对水稻根际铅的动态变化和水稻吸收累积铅的影响.结果表明,淹水显著增加了根表铁膜对铅的吸附和根系对铅的吸收,淹水下苗期和成熟期水稻根系铅含量分别是非淹水处理时的4.2~8.5和1.4~1.5倍;淹水降低了地上部的铅分配,在苗期和成熟期分别降低85.9%~86.7%和51.8%~74.0%.加硒降低了土壤溶液、苗期水稻根系和地上部的铅含量以及成熟期水稻根表铁膜、根系和茎中的铅含量.与对照相比,淹水和非淹水下加硒处理使苗期水稻根系铅含量分别降低了5.4%~24.3%和2.7%~61.7%,使成熟期水稻根系铅含量分别降低了56.1%~64.1%和53.8%~63.2%.水稻籽粒中的铅含量在不同处理间显著差异.因此,水分管理和外源硒的添加显著影响了水稻根系对铅的吸收,而对水稻籽粒对铅的累积显著影响.
英文摘要
      Lead (Pb) accumulation in rice grains has been identified as a potential threat to human health. Our study investigated the effects of varied rates of selenite fertilization (0, 0.5 and 1.0 mg·kg-1) on the dynamics of Pb in soil solutions, and its uptake and translocation by rice under different water management scenarios (aerobic and flooded) in pot experiments. Plants were harvested at seedling stage and at maturity to determine the Pb contents, and soil solutions were extracted during the growing season to monitor the Pb dynamics. Results showed that flooding the soil significantly increased Pb concentrations in DCB extracts and rice roots both at seedling stage and maturity. Root Pb contents in flooded treatments were 4.2-8.5 and 1.4-1.5 times higher than those under aerobic conditions at rice seedling stage and maturity. Flooding also decreased the percentage of Pb in rice shoots. The Pb content in soil solutions, rice seedlings, rice roots and stems at maturity were significantly decreased by selenite additions. Relative to the control treatment, selenite additions decreased the rice root Pb contents by 5.4%-24.3% and 2.7%-61.7% under flooding and aerobic conditions at seedling stage, respectively; while decreased Pb in rice root by 56.1%-64.1% and 53.8%-63.2% respectively, at maturity. No significant differences existed in grain Pb levels among the treatments. Results demonstrated that water management regimes and selenite additions affected Pb uptake by rice roots significantly, but had no significant influence on Pb accumulation in rice grains.

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