DOI: 10.1007/s10533-018-0436-z
Scopus记录号: 2-s2.0-85044361493
论文题名: Differential effects of chronic and acute simulated seawater intrusion on tidal freshwater marsh carbon cycling
作者: Herbert E.R. ; Schubauer-Berigan J. ; Craft C.B.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 138, 期: 2 起始页码: 137
结束页码: 154
语种: 英语
英文关键词: Carbon cycling
; Carbon dioxide
; Extracellular enzyme activity
; Greenhouse gases
; Methane
; Saltwater intrusion
Scopus关键词: Zizaniopsis miliacea
英文摘要: Tidal freshwater ecosystems experience acute seawater intrusion associated with periodic droughts, but are expected to become chronically salinized as sea level rises. Here we report the results from an experimental manipulation in a tidal freshwater Zizaniopsis miliacea marsh on the Altamaha River, GA where diluted seawater was added to replicate marsh plots on either a press (constant) or pulse (2 months per year) basis. We measured changes in porewater chemistry (SO4 2−, Cl−, organic C, inorganic nitrogen and phosphorus), ecosystem CO2 and CH4 exchange, and microbial extracellular enzyme activity. We found that press (chronic) seawater additions increased porewater chloride and sulfate almost immediately, and ammonium and phosphate after 2–4 months. Chronic increases in salinity also decreased net ecosystem exchange, resulting in reduced CO2 and CH4 emissions from press plots. Our pulse treatment, designed to mimic natural salinity incursion in the Altamaha River (September and October), temporarily increased porewater ammonium concentrations but had few lasting effects on porewater chemistry or ecosystem carbon balance. Our findings suggest that long-term, chronic saltwater intrusion will lead to reduced C fixation and the potential for increased nutrient (N, P) export while acute pulses of saltwater will have temporary effects. © 2018, Springer International Publishing AG, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83166
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: School of Public and Environmental Affairs, Indiana University, Bloomington, IN, United States; US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Cincinnati, OH, United States
Recommended Citation:
Herbert E.R.,Schubauer-Berigan J.,Craft C.B.. Differential effects of chronic and acute simulated seawater intrusion on tidal freshwater marsh carbon cycling[J]. Biogeochemistry,2018-01-01,138(2)