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| Titel |
Carbon exchange between the atmosphere and subtropical forested cypress and pine wetlands |
| VerfasserIn |
W. B. Shoemaker, F. Anderson, J. G. Barr, S. L. Graham, D. B. Botkin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 8 ; Nr. 12, no. 8 (2015-04-16), S.2285-2300 |
| Datensatznummer |
250117901
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| Publikation (Nr.) |
 copernicus.org/bg-12-2285-2015.pdf |
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| Zusammenfassung |
| Carbon dioxide exchange between the atmosphere and forested subtropical
wetlands is largely unknown. Here we report a first step in characterizing
this atmospheric–ecosystem carbon (C) exchange, for cypress strands and pine
forests in the Greater Everglades of Florida as measured with eddy
covariance methods at three locations (Cypress Swamp, Dwarf Cypress and Pine
Upland) for 2 years. Links between water and C cycles are also examined at
these three sites, as are methane emission measured only at the Dwarf Cypress
site. Each forested wetland showed net C uptake from the atmosphere both
monthly and annually, as indicated by the net ecosystem exchange (NEE) of carbon
dioxide (CO2). For this study, NEE is the difference between
photosynthesis and respiration, with negative values representing uptake
from the atmosphere that is retained in the ecosystem or transported
laterally via overland flow (unmeasured for this study). Atmospheric C uptake (NEE) was greatest at the Cypress Swampp (−900 to −1000 g C m2 yr−1), moderate at the Pine
Upland (−650 to −700 g C m2 yr−1) and least at the Dwarf Cypress
(−400 to −450 g C m2 yr−1). Changes in NEE were clearly a function
of seasonality in solar insolation, air temperature and flooding, which
suppressed heterotrophic soil respiration. We also note that changes in the
satellite-derived enhanced vegetation index (EVI) served as a useful
surrogate for changes in NEE at these forested wetland sites. |
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