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| Titel |
Carbon budget of tropical forests in Southeast Asia and the effects of deforestation: an approach using a process-based model and field measurements |
| VerfasserIn |
M. Adachi, A. Ito, A. Ishida, W. R. Kadir, P. Ladpala, Y. Yamagata |
| 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. 9 ; Nr. 8, no. 9 (2011-09-20), S.2635-2647 |
| Datensatznummer |
250006126
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| Publikation (Nr.) |
 copernicus.org/bg-8-2635-2011.pdf |
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| Zusammenfassung |
| More reliable estimates of the carbon (C) stock within forest ecosystems and
C emission induced by deforestation are urgently needed to mitigate the
effects of emissions on climate change. A process-based terrestrial
biogeochemical model (VISIT) was applied to tropical primary forests of two
types (a seasonal dry forest in Thailand and a rainforest in Malaysia) and
one agro-forest (an oil palm plantation in Malaysia) to estimate the C
budget of tropical ecosystems in Southeast Asia, including the impacts of
land-use conversion. The observed aboveground biomass in the seasonal dry
tropical forest in Thailand (226.3 t C ha−1) and the rainforest in
Malaysia (201.5 t C ha−1) indicate that tropical forests of Southeast
Asia are among the most C-abundant ecosystems in the world. The model
simulation results in rainforests were consistent with field data, except for
the NEP, however, the VISIT model tended to underestimate C budget and stock
in the seasonal dry tropical forest. The gross primary production (GPP)
based on field observations ranged from 32.0 to 39.6 t C ha−1 yr−1
in the two primary forests, whereas the model slightly underestimated GPP
(26.5–34.5 t C ha−1 yr−1). The VISIT model appropriately captured
the impacts of disturbances such as deforestation and land-use conversions
on the C budget. Results of sensitivity analysis showed that the proportion
of remaining residual debris was a key parameter determining the soil C
budget after the deforestation event. According to the model simulation, the
total C stock (total biomass and soil C) of the oil palm plantation was
about 35% of the rainforest's C stock at 30 yr following initiation of
the plantation. However, there were few field data of C budget and stock,
especially in oil palm plantation. The C budget of each ecosystem must be
evaluated over the long term using both the model simulations and
observations to understand the effects of climate and land-use conversion on
C budgets in tropical forest ecosystems. |
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