期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 65, 期 -, 页码 329-337出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2013.06.001
关键词
Hg; Mercury biosensor; Critical limit; Terminal restriction fragment length polymorphism; Basal respiration; Forest soils
类别
资金
- Federal Office for the Environment [09-0084.PJ/I235-1899, 10-0022.PJ/K314-0658]
This study evaluates the response of the bacterial communities to different mercury (Hg) amendments in temperate forest soils. Seven soils were spiked with increasing amounts of Hg [(0, 0.032, 0.32, 3.2 and 32 mu g Hg(II) g(-1) dry soil]. After 30 days, we examined the bioavailable Hg using bacterial biosenors (merlux), basal respiration, bacterial community structures and identified indicator OTUs which were responsive to Hg. In soils treated with at least 3.2 mu g Hg g(-1) dry soil, resulting in bioavailable Hg higher than 0.004 mu g Hg g(-1) dry soil, the basal respiration was strongly affected. High bioavailable Hg also caused significant changes in the bacterial T-RFLP profiles. Members of the Alphaproteobacteria (Rhodospirillales) and Betaproteobacteria (Burkholderiales) were found to be Hg-tolerant. Here, we propose a critical limit concentration for soluble Hg of 0.004 mu g Hg g(-1) soil. (C) 2013 Elsevier Ltd. All rights reserved.
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