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| Titel |
Ecosystem carbon exchanges of a subtropical evergreen coniferous plantation subjected to seasonal drought, 2003–2007 |
| VerfasserIn |
X.-F. Wen, H.-M. Wang, J.-L. Wang, G.-R. Yu, X.-M. Sun |
| 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 ; 7, no. 1 ; Nr. 7, no. 1 (2010-01-28), S.357-369 |
| Datensatznummer |
250004387
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| Publikation (Nr.) |
 copernicus.org/bg-7-357-2010.pdf |
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| Zusammenfassung |
| The behavior of whole ecosystems in humid climate zone in response to
drought is less well documented. Continuous measurements of carbon dioxide
and water vapor exchange using the eddy covariance technique during
2003–2007 were made above a subtropical evergreen coniferous plantation in
Southeast China. Seasonal distribution of precipitation and temperature was
inconsistent during the summer, which resulted in droughts frequently. Gross
ecosystem photosynthesis (GEP), ecosystem respiration (RE) and net ecosystem
production (NEP) showed clear seasonality, with low rates during droughts
and in winter. With statistical significance, the monthly GEP and RE
increased exponentially with air temperature, but the monthly NEP was less
sensitive and only increased linearly with air temperature. However, the
function response of monthly NEP and its components (GEP and RE) disappeared
under high temperature and low soil moisture. Monthly and yearly RE showed a
statistically linear and positive dependence on the corresponding GEP.
Annual NEP varied among years from 306 to 430 g C m−2 (mean 395, SD 50).
Interannual variability in NEP was controlled primarily by air
temperature and the ratio of precipitation and evapotranspiration that
affected the RE/GEP ratio, which varied between 0.76 and 0.81 (mean 0.78,
SD 0.02). |
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