铬耐性菌对土壤中六价铬的还原作用

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Abstract

In this study, seven representative agricultural soils with different physicochemical properties were used to investigate the response of soil microbial community to Cr contamination and the effect of indigenous chromium-resistant bacteria on reduction of hexavalent chromium in soils. Our results demonstrated that soil bacterial community was responded to Cr contamination through changes in bacterial community structure, with Cr-resistant bacteria became dominant species, and the percentage of Cr-resistant bacteria of total cultivable bacteria was 89.9%, 75.2%, 92.8%, 65.3%, 72.8%, 77.3%, and 65.4%, respectively for Periudic Argosols, Udic Ferrisols, Calcaric Regosols, Stagnic Anthrosols, Mollisols, Typic Haplustalfs, and Ustic Cambosols. Microbial reduction was an important Cr(VI) reduction pathway, and the relative contribution of microorganisms to Cr(VI) reduction was 14.4%, 44.0%, 20.6%, 34.9%, 21.9%, 21.7%, and 22.0%, respectively. Soil properties, Fe(II) and soil particle distribution, affected the microbially mediated Cr(VI) reduction. Moreover, Bacillus, Escherichia, Deinococcus, Micromonospora, Methylobacterium, Massilia, Acidobacterium, Comamonas, Bradyrhizobium, and Arthrobacter were identified as the Cr-resistant bacteria.

Key words： hexavalent chromium chromium resistant bacteria dominant bacteria cloning-sequencing correlation analysis

Received: 18 July 2016

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X172

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	Articles by authors
	XIAO Wen-dan
	YE Xue-zhu
	SUN Cai-xia
	ZHANG Qi
	XU Ping

Cite this article:

XIAO Wen-dan,YE Xue-zhu,SUN Cai-xia等. The effect of chromium-resistant bacteria on reduction of hexavalent chromium in soils[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 1120-1129.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I3/1120

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