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| Titel |
Dependence of coastal wetland ecosystem respiration on temperature and tides: a temporal perspective |
| VerfasserIn |
X. Xie, M.-Q. Zhang, B. Zhao, H.-Q. Guo |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2014-02-03), S.539-545 |
| Datensatznummer |
250117181
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| Publikation (Nr.) |
 copernicus.org/bg-11-539-2014.pdf |
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| Zusammenfassung |
| Variations in temperature are widely invoked to explain fluctuations in
ecosystem respiration (ER), but hydrological conditions also influence ER.
Many researchers have observed that aperiodic variations in hydrological
conditions affect ER and the associated temperature sensitivity. However,
little is known about how periodic hydrological dynamics affect ER and its
relationship with temperature on different timescales. In the present study,
data from two coastal wetland sites were used to compare the variations in
thermal and tidal influences on ER at three timescales (monthly, seasonal,
and semiannual), and we found that (1) the influences of tides and
temperature on ER varied with time. Especially in summer, the ER exhibited
periodic dynamics regulated by tides; (2) in the temporal domain, temperature
was dominant at the semiannual and seasonal scales, while the tidal effect
was dominant at the monthly scale. In the spatial domain, the relative
importance of temperature was greater at higher elevation sites, while tides
exerted more influence at lower elevation sites; (3) the monthly model with
tidal effect performed best, while regression models at semiannual and
seasonal scales generated systematic errors in ER. These results demonstrate
that, for coastal wetlands, the application of parameters from regression
models based on long-term (seasonal or semiannual) data should be avoided in
gap filling, and the effects of tides and elevation should be considered in
estimating the carbon budget. |
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