Direct and indirect effects of elevated atmospheric CO2 on net ecosystem production in a Chesapeake Bay tidal wetland

The rapid increase in atmospheric CO2 concentrations (Ca) has resulted in extensive research efforts to understand its impact on terrestrial ecosystems, especially carbon balance. Despite these efforts, there are relatively few data comparing net ecosystem exchange of CO2 between the atmosphere and...

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Bibliographic Details
Published in:Global change biology 2013-11, Vol.19 (11), p.3368-3378
Main Authors: Erickson, John E., Peresta, Gary, Montovan, Kathryn J., Drake, Bert G.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Atmosphere
Bays
Biological and medical sciences
Carbon Cycle
Carbon Dioxide - analysis
carbon storage
Climate Change
Cyperaceae - metabolism
Ecosystem
ecosystem respiration
elevated CO2
Environmental impact
Fundamental and applied biological sciences. Psychology
General aspects
Global warming
Greenhouse gases
net ecosystem CO2 exchange
nitrogen
Nitrogen - analysis
photosynthesis
Plant Shoots - metabolism
Poaceae - metabolism
Scirpus olneyi
Sea water ecosystems
Synecology
Terrestrial ecosystems
tidal wetlands
Wetlands
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Summary:The rapid increase in atmospheric CO2 concentrations (Ca) has resulted in extensive research efforts to understand its impact on terrestrial ecosystems, especially carbon balance. Despite these efforts, there are relatively few data comparing net ecosystem exchange of CO2 between the atmosphere and the biosphere (NEE), under both ambient and elevated Ca. Here we report data on annual sums of CO2 (NEEnet) for 19 years on a Chesapeake Bay tidal wetland for Scirpus olneyi (C3 photosynthetic pathway)‐ and Spartina patens (C4 photosynthetic pathway)‐dominated high marsh communities exposed to ambient and elevated Ca (ambient + 340 ppm). Our objectives were to (i) quantify effects of elevated Ca on seasonally integrated CO2 assimilation (NEEnet = NEEday + NEEnight, kg C m−2 y−1) for the two communities; and (ii) quantify effects of altered canopy N content on ecosystem photosynthesis and respiration. Across all years, NEEnet averaged 1.9 kg m−2 y−1 in ambient Ca and 2.5 kg m−2 y−1 in elevated Ca, for the C3‐dominated community. Similarly, elevated Ca significantly (P 
ISSN:1354-1013
1365-2486
DOI:10.1111/gcb.12316