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| Titel |
Effects of a windthrow disturbance on the carbon balance of a broadleaf deciduous forest in Hokkaido, Japan |
| VerfasserIn |
K. Yamanoi, Y. Mizoguchi, H. Utsugi |
| 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. 23 ; Nr. 12, no. 23 (2015-12-01), S.6837-6851 |
| Datensatznummer |
250118185
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| Publikation (Nr.) |
 copernicus.org/bg-12-6837-2015.pdf |
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| Zusammenfassung |
| Forests play an important role in the terrestrial carbon balance,
with most being in a carbon sequestration stage. The net carbon
releases that occur result from forest disturbance, and windthrow is
a typical disturbance event affecting the forest carbon balance in
eastern Asia. The CO2 flux has been measured using the eddy
covariance method in a deciduous broadleaf forest (Japanese white
birch, Japanese oak, and castor aralia) in Hokkaido, where
incidental damage by the strong Typhoon Songda in 2004 occurred. We also
used the biometrical method to demonstrate the CO2 flux within
the forest in detail. Damaged trees amounted to 40 % of all trees, and they
remained on site where they were not extracted by forest
management. Gross primary production (GPP), ecosystem respiration
(Re), and net ecosystem production were 1350, 975, and
375 g C m−2 yr−1 before the disturbance and 1262,
1359, and −97 g C m−2 yr−1 2 years after the
disturbance, respectively. Before the disturbance, the forest was an
evident carbon sink, and it subsequently transformed into a net carbon
source. Because of increased light intensity at the forest floor, the leaf
area index and biomass of the undergrowth (Sasa kurilensis and
S. senanensis) increased by factors of 2.4 and 1.7, respectively, in 3
years subsequent to the disturbance. The photosynthesis
of Sasa increased rapidly and contributed to the total GPP
after the disturbance. The annual GPP only decreased by 6 % just
after the disturbance. On the other hand, the annual Re increased by
39 % mainly because of the decomposition of residual coarse-wood
debris. The carbon balance after the disturbance was controlled by
the new growth and the decomposition of residues. The forest
management, which resulted in the dead trees remaining at the study
site, strongly affected the carbon balance over the years. When
comparing the carbon uptake efficiency at the study site with that at
others, including those with various kinds of disturbances, we emphasized the
importance of forest management as well as disturbance type in the
carbon balance. |
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