Arsenic uptake and accumulation in rice (Oryza sativa L.) irrigated with contaminated water
Arsenic uptake and accumulation in rice (Oryza sativa L.) irrigated with contaminated water
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DOI：
10.1023/a:1015792723288
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发表时间：
2002-03-01
期刊：
影响因子：
4.9
通讯作者：
Meharg, AA
中科院分区：
文献类型：
--
作者：
Abedin, MJ;Cotter-Howells, J;Meharg, AA
长期使用受砷污染的地下水灌溉作物，特别是水稻（Oryza sativa L.），导致孟加拉国土壤砷含量升高。因此，人们担心在这些土壤上种植的水稻会积累砷。通过温室盆栽试验，研究了砷污染灌溉水对水稻生长及稻谷、稻壳、秸秆和根系对砷吸收的影响。5种砷酸盐灌溉水浓度（0 ~ 8 mg As l(-)1）和2种土壤磷酸盐改良剂的组合处理共10个。施用含砷灌溉水使水稻株高降低，产量下降，影响根系生长发育。随着灌溉水中砷酸盐浓度的增加，植物各部位的砷含量也随之增加。然而，稻米中的砷含量并未超过最大允许限量1.0 mg As kg(-)1。水稻秸秆中的砷积累水平非常高，这表明用这种受污染的秸秆喂养牛可能对它们的健康构成直接威胁，也可能通过可能受污染的牛肉和牛奶间接威胁人类健康。施用磷肥对植株生长发育及各部位砷含量均无显著影响。
Long-term use of arsenic contaminated groundwater to irrigate crops, especially paddy rice (Oryza sativa L.) has resulted in elevated soil arsenic levels in Bangladesh. There is, therefore, concern regarding accumulation of arsenic in rice grown on these soils. A greenhouse pot experiment was conducted to evaluate the impact of arsenic-contaminated irrigation water on the growth and uptake of arsenic into rice grain, husk, straw and root. There were altogether 10 treatments which were a combination of five arsenate irrigation water concentrations (0-8 mg As l(-)1) and two soil phosphate amendments. Use of arsenate containing irrigation water reduced plant height, decreased rice yield and affected development of root growth. Arsenic concentrations in all plant parts increased with increasing arsenate concentration in irrigation water. However, arsenic concentration in rice grain did not exceed the maximum permissible limit of 1.0 mg As kg(-)1. Arsenic accumulation in rice straw at very high levels indicates that feeding cattle with such contaminated straw could be a direct threat for their health and also, indirectly, to human health via presumably contaminated bovine meat and milk. Phosphate application neither showed any significant difference in plant growth and development, nor in As concentrations in plant parts.