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| Titel |
Underestimated effects of low temperature during early growing season on carbon sequestration of a subtropical coniferous plantation |
| VerfasserIn |
W.-J. Zhang, H.-M. Wang, F.-T. Yang, Y.-H. Yi, X.-F. Wen, X.-M. Sun, G.-R. Yu, Y.-D. Wang, J.-C. Ning |
| 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 ; 8, no. 6 ; Nr. 8, no. 6 (2011-06-23), S.1667-1678 |
| Datensatznummer |
250005963
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| Publikation (Nr.) |
 copernicus.org/bg-8-1667-2011.pdf |
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| Zusammenfassung |
The impact of air temperature in early growing season on the carbon
sequestration of a subtropical coniferous plantation was discussed through
analyzing the eddy flux observations at Qianyanzhou (QYZ) site in
southern China from 2003 to 2008. This site experienced two cold early
growing seasons (with temperature anomalies of 2–5 °C) in 2005 and 2008,
and a severe summer drought in 2003.
Results indicated that the low air temperature from January to March was the
major factor controlling the inter-annual variations in net carbon uptake at
this site, rather than the previously thought summer drought. The
accumulative air temperature from January to February showed high
correlation (R2=0.970, p<0.001) with the annual net ecosystem
production (NEP). This was due to the controls of early-month temperature on
the plant phenology developing and the growing season length at this
subtropical site. The cold spring greatly shortened the growing season
length and therefore reduced the carbon uptake period. The eddy flux
observations showed a carbon loss of 4.04 g C m−2 per growing-season
day at this coniferous forest site. On the other hand, the summer drought
also reduced the net carbon uptake strength because the photosynthesis was
more sensitive to water deficit stress than the ecosystem respiration.
However, the impact of summer drought occurred within a relatively shorter
period and the carbon sequestration went back to the normal level once the
drought was relieved. |
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