期刊
ENVIRONMENTAL POLLUTION
卷 194, 期 -, 页码 217-223出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.08.004
关键词
Arsenic; Arsenic speciation; Arsenic methylation; Contamination; Rice
资金
- National Natural Science Foundation of China [41330853]
- special fund for agro-scientific research in the public interest [201403015]
- Innovative Research Team Development Plan of the Ministry of Education of China [IRT1256]
- Biotechnology and Biological Sciences Research Council [BB/H006303/1, BBS/E/C/00004960] Funding Source: researchfish
- BBSRC [BBS/E/C/00004960, BB/H006303/1] Funding Source: UKRI
Rice is a major source of dietary arsenic (As). The effects of paddy water management, straw incorporation, the applications of nitrogen fertilizer or organic manure, and the additions of biochar on arsenic accumulation and speciation in rice grain were investigated under field conditions over four cropping seasons in Hunan, China. Treatments that promoted anaerobic conditions in the soil, including continuous flooding and straw incorporation, significantly increased the concentration of As, especially methylated As species, in rice grain, whereas N application rate and biochar additions had little or inconsistent effect. Continuous flooding and straw incorporation also increased the abundance of the arsenite methyltransferase gene arsM in the soil, potentially enhancing As methylation in the soil and the uptake of methylated As by rice plants. Intermittent flooding was an effective method to decrease As accumulation in rice grain. (C) 2014 Elsevier Ltd. All rights reserved.
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