| DOI: | 10.1111/gcb.12431
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| 论文题名: | Salinity affects microbial activity and soil organic matter content in tidal wetlands |
| 作者: | Morrissey E.M.; Gillespie J.L.; Morina J.C.; Franklin R.B.
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| 刊名: | Global Change Biology
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| ISSN: | 13541013
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| 出版年: | 2014
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| 卷: | 20, 期:4 | | 起始页码: | 1351
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| 结束页码: | 1362
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| 语种: | 英语
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| 英文关键词: | Carbon cycling
; Decomposition
; Extracellular enzyme activity
; Marsh
; Microbial community structure
; Saltwater intrusion
; Sea level rise
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| Scopus关键词: | decomposition
; enzyme activity
; intertidal environment
; microbial activity
; microbial community
; saline intrusion
; salinity
; sea level change
; soil organic matter
; wetland
; Chesapeake Bay
; United States
; Bacteria (microorganisms)
; sea water
; soil
; bay
; chemistry
; ecosystem
; microbiology
; salinity
; soil
; United States
; wetland
; Bays
; Ecosystem
; Salinity
; Seawater
; Soil
; Soil Microbiology
; Virginia
; Wetlands
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| 英文摘要: | Climate change-associated sea level rise is expected to cause saltwater intrusion into many historically freshwater ecosystems. Of particular concern are tidal freshwater wetlands, which perform several important ecological functions including carbon sequestration. To predict the impact of saltwater intrusion in these environments, we must first gain a better understanding of how salinity regulates decomposition in natural systems. This study sampled eight tidal wetlands ranging from freshwater to oligohaline (0-2 ppt) in four rivers near the Chesapeake Bay (Virginia). To help isolate salinity effects, sites were selected to be highly similar in terms of plant community composition and tidal influence. Overall, salinity was found to be strongly negatively correlated with soil organic matter content (OM%) and C : N, but unrelated to the other studied environmental parameters (pH, redox, and above- and below-ground plant biomass). Partial correlation analysis, controlling for these environmental covariates, supported direct effects of salinity on the activity of carbon-degrading extracellular enzymes (β-1, 4-glucosidase, 1, 4-β-cellobiosidase, β-D-xylosidase, and phenol oxidase) as well as alkaline phosphatase, using a per unit OM basis. As enzyme activity is the putative rate-limiting step in decomposition, enhanced activity due to salinity increases could dramatically affect soil OM accumulation. Salinity was also found to be positively related to bacterial abundance (qPCR of the 16S rRNA gene) and tightly linked with community composition (T-RFLP). Furthermore, strong relationships were found between bacterial abundance and/or composition with the activity of specific enzymes (1, 4-β-cellobiosidase, arylsulfatase, alkaline phosphatase, and phenol oxidase) suggesting salinity's impact on decomposition could be due, at least in part, to its effect on the bacterial community. Together, these results indicate that salinity increases microbial decomposition rates in low salinity wetlands, and suggests that these ecosystems may experience decreased soil OM accumulation, accretion, and carbon sequestration rates even with modest levels of saltwater intrusion. © 2013 John Wiley & Sons Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/61938
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| Appears in Collections: | 影响、适应和脆弱性
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作者单位: | Department of Biology, Virginia Commonwealth University, 1000 W Cary Street, Richmond, VA 23284, United States
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| Recommended Citation: | |
Morrissey E.M.,Gillespie J.L.,Morina J.C.,et al. Salinity affects microbial activity and soil organic matter content in tidal wetlands[J]. Global Change Biology,2014-01-01,20(4)
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