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| Titel |
Individual- and stand-level stem CO2 efflux in a subtropical Schima superba plantation |
| VerfasserIn |
L. W. Zhu, P. Zhao, G. Y. Ni, Q. P. Cao, C. M. Zhou, X. P. Zeng |
| 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 ; 9, no. 10 ; Nr. 9, no. 10 (2012-10-02), S.3729-3737 |
| Datensatznummer |
250007316
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| Publikation (Nr.) |
 copernicus.org/bg-9-3729-2012.pdf |
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| Zusammenfassung |
| Stem respiration is an important, but poorly studied component of total
forest ecosystem respiration. Stem CO2 efflux was investigated with an
open gas exchange system while stand microclimate and stem temperature were
continuously monitored in a Schima superba plantation in South China for several days in
August and December 2010. The temperature response of respiration in the
different seasons, the vertical variation in stem CO2 efflux along the
stem, and the stand-level stem CO2 efflux were examined. Stem volume was
identified as the better correlate for stem CO2 efflux and was used as
the scalar for the stand-level estimates of stem CO2 efflux in this S. superba
plantation. Volume-based stem CO2 efflux was higher at 2 m than at 1.3 m.
Mean stem CO2 efflux was 268.9 and 104.6 μmol m−3 s−1
in August and December, respectively, indicating a dramatic seasonal
variation of stem CO2 efflux. The temperature response of stem CO2
efflux remained constant during our study period with Q10 values of 1.9
and 1.8. In this subtropical S. superba plantation, stem CO2 efflux per unit
ground area averaged 3.36 and 1.26 μmol m−2 s−1 based on the
measurement data at 1.3-m height of the stem in August and December,
respectively. Our results suggest that stem CO2 efflux has a constant
temperature response, and the seasonal variation in stem CO2 efflux is
mainly controlled by stem temperature, and the vertical variation in stem
CO2 efflux needs to be considered in the stand-level estimation. |
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