DOI: 10.1111/gcb.14486
Scopus记录号: 2-s2.0-85058012412
论文题名: Novel microbial community composition and carbon biogeochemistry emerge over time following saltwater intrusion in wetlands
作者: Dang C. ; Morrissey E.M. ; Neubauer S.C. ; Franklin R.B.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2019
卷: 25, 期: 2 起始页码: 549
结束页码: 561
语种: 英语
英文关键词: carbon biogeochemistry
; methanogenesis
; microbial community composition
; saltwater intrusion
; soil
; succession
; sulfate-reducing bacteria
Scopus关键词: biogeochemistry
; carbon cycle
; carbon sequestration
; community composition
; environmental change
; estuarine front
; marsh
; methanogenesis
; microbial community
; saline intrusion
; soil microorganism
; sulfate-reducing bacterium
; wetland
; Fungi
; Prokaryota
英文摘要: Sea level rise and changes in precipitation can cause saltwater intrusion into historically freshwater wetlands, leading to shifts in microbial metabolism that alter greenhouse gas emissions and soil carbon sequestration. Saltwater intrusion modifies soil physicochemistry and can immediately affect microbial metabolism, but further alterations to biogeochemical processing can occur over time as microbial communities adapt to the changed environmental conditions. To assess temporal changes in microbial community composition and biogeochemical activity due to saltwater intrusion, soil cores were transplanted from a tidal freshwater marsh to a downstream mesohaline marsh and periodically sampled over 1 year. This experimental saltwater intrusion produced immediate changes in carbon mineralization rates, whereas shifts in the community composition developed more gradually. Salinity affected the composition of the prokaryotic community but did not exert a strong influence on the community composition of fungi. After only 1 week of saltwater exposure, carbon dioxide production doubled and methane production decreased by three orders of magnitude. By 1 month, carbon dioxide production in the transplant was comparable to the saltwater controls. Over time, we observed a partial recovery in methane production which strongly correlated with an increase in the relative abundance of three orders of hydrogenotrophic methanogens. Taken together, our results suggest that ecosystem responses to saltwater intrusion are dynamic over time as complex interactions develop between microbial communities and the soil organic carbon pool. The gradual changes in microbial community structure we observed suggest that previously freshwater wetlands may not experience an equilibration of ecosystem function until long after initial saltwater intrusion. Our results suggest that during this transitional period, likely lasting years to decades, these ecosystems may exhibit enhanced greenhouse gas production through greater soil respiration and continued methanogenesis. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117516
Appears in Collections: 气候变化与战略
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Recommended Citation:
Dang C.,Morrissey E.M.,Neubauer S.C.,et al. Novel microbial community composition and carbon biogeochemistry emerge over time following saltwater intrusion in wetlands[J]. Global Change Biology,2019-01-01,25(2)