Microbes influence the fractionation of arsenic in paddy soils with different fertilization regimes

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Microbes influence the fractionation of arsenic in paddy soils with different fertilization regimes
	Li, Feng ; Zheng, Yuan-Ming ; He, Ji-Zheng
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2009-04-01
卷号	407 期号:8 页码:2631-2640
关键词	Arsenic Fractionation Microbes Long-term fertilization Paddy soil Risk assessment
中文摘要	Sequential extraction procedures were used to investigate the influence of the microbes on the distribution of arsenic in a Chinese paddy soil under different long-term fertilization treatments. The paddy soil with four long-term fertilization treatments (CK, M, NPK and NPK+M) and three levels of arsenate addition (0, 50, 100 mgAs kg(-1) dry soil), were selected to construct microcosms for laboratory incubation. After the incubation, soil samples were sequentially extracted to determine As in various fractions, i.e. water soluble (170), exchangeable (171), bound to carbonates (F2), bound to Fe and Mn oxides (173), bound to organic matter and sulfides (F4), and residual (F5, mineral matrix). Results showed that most of the As was fixed by mineral matrix (F5, ratios ranging from 46.22% to 96.37%), followed by As bound to Fe and Mn oxides (F3, ratios ranging from 3.14% to 28.18%), and the ratios of the other four fractions (F0, F1, F2 and F4) were mostly less than 10%. The microbes in the paddy soil could make As transform from inactive fraction (175) to relatively active fractions (F0, F1, F2 and 173) and thus increase its environmental risk. With the increase of the As addition levels and with the application of manure or chemical NPK fertilizers, As was distributed more in the relatively active fractions (F0, F1, F2, F3 and F4) in the paddy soil mediated by the microbes. In addition, Fe and Mn oxides could play an important role in decreasing the As leaching potential from the mineral matrix to soil solution and thus abate the As risk to human health. (C) 2008 Elsevier B.V. All rights reserved.
WOS记录号	WOS:000264922000019
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/21397]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Li, Feng,Zheng, Yuan-Ming,He, Ji-Zheng. Microbes influence the fractionation of arsenic in paddy soils with different fertilization regimes[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2009,407(8):2631-2640.
APA	Li, Feng,Zheng, Yuan-Ming,&He, Ji-Zheng.(2009).Microbes influence the fractionation of arsenic in paddy soils with different fertilization regimes.SCIENCE OF THE TOTAL ENVIRONMENT,407(8),2631-2640.
MLA	Li, Feng,et al."Microbes influence the fractionation of arsenic in paddy soils with different fertilization regimes".SCIENCE OF THE TOTAL ENVIRONMENT 407.8(2009):2631-2640.