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- Title
Responses of CO2 and CH4 fluxes in early stage managed re-alignment saltmarshes to tidal inundation and climatic conditions.
- Authors
Waddington, Emma; Rowson, James; Antunes, André; Mossman, Hannah
- Abstract
Saltmarsh restoration projects convert historic saltmarshes, reclaimed for agricultural land,back to functional saltmarshes, a process known as managed re-alignment. However,knowledge of carbon cycling at managed re-alignment sites is limited, speculation exists as tothe magnitude of CO2and CH4 fluxes and whether managed re-alignment sites are net carbonsinks. A closed chamber method was used to collect data on CO2and CH4 fluxes at a newlycreated managed re-alignment site in Hesketh, North-West England, and a naturallyestablishing saltmarsh in Southport, North-West England. Site net ecosystem respiration for the managed re-alignment site ranged from 0.020 gCO2m−2 h−1 to 0.279 gCO2 m−2 h−1 and had a slight positive correlation with soil temperature(r2= 0.385 n=32). Data from a nearby natural saltmarsh demonstrated NER (NetEcosystem Respiration) values between 0.119 gCO2 m−2 h−1 and 0.826 gCO2 m−2 h−1and had a stronger positive correlation between NER and soil temperature (r2=0.488 n=17) than the managed re-alignment site. Initial data reveals that early stagemanaged re-alignment site carbon NEE (Net Ecosystem Exchange) is sensitiveto tidal inundation. NEE CO2fluxes reached their highest values on the managedre-alignment saltmarsh (0.238 gCO2 m−2 h−1) after an inundation following a dry period(584 hours). Conversely CH4fluxes for the managed re-alignment site were at theirlowest values (-2.285E-5 gCH4 m−2 h−1) during the same tidal inundation period.Following a similar drying period (559 hours) the natural saltmarsh continued tosink CO2(-0.195 gCO2 m−2 h−1), but converted from a CH4 source (max value of0.784E-5 gCH4 m−2 h−1) to a sink (max value -4.023E-5 gCH4 m−2 h−1) followinginundation. The managed re-alignment site continued as a NEE CO2 source until asecond drying period occurred (157 hours) following a series of low tides returning itto a sink (-0.009 gCO2 m−2 h−1). The natural site continued as a net ecosystemexchange CO2 sink until vegetation die back occurred in late October returning it to asource of both CO2 (0.103 gCO2 m−2 h−1) and CH4 (0.779E-5 gCH4 m−2 h−1).
- Subjects
ENGLAND; SALT marshes; FLOODS; SOIL temperature; CARBON cycle; FLUX (Energy)
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article