气候变化领域集成服务门户(CCPortal): Tidal rewetting in salt marshes triggers pulses of nitrous oxide emissions but slows carbon dioxide emission

CCPortal

DOI	10.1016/j.soilbio.2021.108197
	Tidal rewetting in salt marshes triggers pulses of nitrous oxide emissions but slows carbon dioxide emission
	Emery H.E.; Angell J.H.; Tawade A.; Fulweiler R.W.
发表日期	2021
ISSN	380717
卷号	156
英文摘要	Pulsed emission of CO2 following rainfall in terrestrial ecosystems is well characterized, but coastal wetlands show the opposite trend for CO2, and less is known about the responses of other biogenic greenhouse gases like CH4 and N2O. Tidal inundation in coastal wetlands such as salt marshes is an additional form of rewetting with the potential to cause biological pulses that may not resemble rain-induced pulses. Accurately predicting the carbon and nitrogen cycling in salt marshes requires estimates of pulse responses to both rainfall and tidal inundation, in addition to baseline greenhouse gas flux rates. We measured CO2, CH4, and N2O fluxes from salt marsh sediment cores while we simulated rewetting by rainfall and/or tidal inundation, and we measured the total and potentially-active microbial communities at the end of the experiment. Rewetting from tidal inundation and from rainfall led to a short term (begun within 1 h, concluded within ~1 d) pulse of N2O, a sustained drop in CO2 emission, but no change in CH4. The N2O pulse peaked on average at 20× and 10× baseline flux rates after tidal inundation and rainfall respectively. Peak N2O fluxes far exceeded the highest emission observed in field measurements at these sites. By global warming potential, the pulse of N2O only slightly offset the drop in CO2 emission, therefore rewetting had a net cooling effect on marsh radiative forcing. Microbial communities were similar in rewetted and non-rewetted cores two days after rewetting, which reflects rapid recovery and/or resilience of the community to rewetting. We estimated the contribution of pulsed vs. baseline N2O emissions to annual totals by modelling rewetting events over 65-year tide gauge and precipitation records, and found that pulsed emissions constitute the majority of salt marsh N2O emissions, and could constitute the entirety in marshes with a net-sink baseline. © 2021 Elsevier Ltd
英文关键词	Greenhouse gases; Microbial community; Nitrous oxide; Rewetting; Salt marsh; Tides
scopus关键词	Atmospheric radiation; Carbon dioxide; Drops; Floods; Global warming; Greenhouse gases; Microorganisms; Rain; Tides; Wetlands; CH$-4$; CO$-2$/ emission; Coastal wetlands; Flux rates; Greenhouses gas; Microbial communities; N$-2$/O; Nitrous oxide; Re-wetting; Salt marshes; Nitrogen oxides; carbon dioxide; carbon emission; cooling; methane; nitrous oxide; precipitation (climatology); saltmarsh; tide gauge
来源期刊	Soil Biology and Biochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177191
作者单位	Boston University, Department of Earth and Environmental Science, 685 Commonwealth Ave, Boston, MA 02215, United States; Boston University, Department of Biology, 5 Cummington Mall, Boston, MA 02215, United States
推荐引用方式 GB/T 7714	Emery H.E.,Angell J.H.,Tawade A.,et al. Tidal rewetting in salt marshes triggers pulses of nitrous oxide emissions but slows carbon dioxide emission[J],2021,156.
APA	Emery H.E.,Angell J.H.,Tawade A.,&Fulweiler R.W..(2021).Tidal rewetting in salt marshes triggers pulses of nitrous oxide emissions but slows carbon dioxide emission.Soil Biology and Biochemistry,156.
MLA	Emery H.E.,et al."Tidal rewetting in salt marshes triggers pulses of nitrous oxide emissions but slows carbon dioxide emission".Soil Biology and Biochemistry 156(2021).