DOI: 10.1007/s10533-017-0359-0
Scopus记录号: 2-s2.0-85021970852
论文题名: Biological chlorine cycling in the Arctic Coastal Plain
作者: Zlamal J.E. ; Raab T.K. ; Little M. ; Edwards R.A. ; Lipson D.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期: 3 起始页码: 243
结束页码: 260
语种: 英语
英文关键词: Arctic
; Chlorine
; Dehalococcoides
; Halogen
; Organohalide respiration
; XANES
Scopus关键词: arctic environment
; chlorine
; chronosequence
; concentration (composition)
; genome
; microbial activity
; organic carbon
; organohalogen
; respiration
; soil carbon
; soil chemistry
; tundra soil
; Arctic Coastal Plain
; Dehalococcoides
英文摘要: This study explores biological chlorine cycling in coastal Arctic wet tundra soils. While many previous chlorine-cycling studies have focused on contaminated environments, it is now recognized that chlorine can cycle naturally between inorganic and organic forms in soils. However, these pathways have not previously been described for an Arctic ecosystem. We measured soil organic and inorganic Cl pools, characterized soils and plant tissues with chlorine K-edge X-ray absorption near-edge spectroscopy (Cl-XANES), measured dechlorination rates in laboratory incubations, and analyzed metagenomes and 16S rRNA genes along a chronosequence of revegetated drained lake basins. Concentrations of soil organic chlorinated compounds (Clorg) were correlated with organic matter content, with a steeper slope in older soils. The concentration and chemical diversity of Clorg increased with soil development, with Clorg in younger soils more closely resembling that of vegetation, and older soils having more complex and variable Cl-XANES signatures. Plant Clorg concentrations were higher than previously published values, and can account for the rapid accumulation of Clorg in soils. The high rates of Clorg input from plants also implies that soil Clorg pools turn over many times during soil development. Metagenomic analyses revealed putative genes for synthesis (haloperoxidases, halogenases) and breakdown (reductive dehalogenases, halo-acid dehalogenases) of Clorg, originating from diverse microbial genomes. Many genome sequences with close similarity to known organohalide respirers (e.g. Dehalococcoides) were identified, and laboratory incubations demonstrated microbial organohalide respiration in vitro. This study provides multiple lines of evidence for a complex and dynamic chlorine cycle in an Arctic tundra ecosystem. © 2017, Springer International Publishing AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83253
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Biology, San Diego State University, San Diego, CA, United States; Carnegie Institution for Science, Stanford, CA, United States; Department of Computer Science, San Diego State University, San Diego, CA, United States
Recommended Citation:
Zlamal J.E.,Raab T.K.,Little M.,et al. Biological chlorine cycling in the Arctic Coastal Plain[J]. Biogeochemistry,2017-01-01,134(3)