Frey B, Rieder S R (2013) Response of forest soil bacterial communities to mercury chloride application. Soil Biology and Biochemistry, 65: 329-337. [10.1016/j.soilbio.2013.06.001] |
Keywords
Basal respiration; Critical limit; Forest soils; Hg; Mercury biosensor; Terminal restriction fragment length polymorphism |
Abstract
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 32µgHg(II)g-1 dry soil]. After 30 days, we examined the bioavailable Hg using bacterial biosenors (mer-lux), basal respiration, bacterial community structures and identified indicator OTUs which were responsive to Hg. In soils treated with at least 3.2µgHgg-1 dry soil, resulting in bioavailable Hg higher than 0.004µgHgg-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 0.004µgHgg-1 soil. © 2013 Elsevier Ltd. |
LWF Classification
Network: LWF, Sites: Lausanne; Schänis, Category: ISI, |