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| Titel |
The impact of climate variation and disturbances on the carbon balance of forests in Hokkaido, Japan |
| VerfasserIn |
R. Hirata, K. Takagi, A. Ito, T. Hirano, N. Saigusa |
| 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 ; 11, no. 18 ; Nr. 11, no. 18 (2014-09-24), S.5139-5154 |
| Datensatznummer |
250117608
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| Publikation (Nr.) |
 copernicus.org/bg-11-5139-2014.pdf |
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| Zusammenfassung |
| We evaluated the long-term (52-year) effect of climate, disturbance, and
subsequent recovery on the carbon balance of cool temperate forests by using
the process-based ecosystem model VISIT. The study sites were artificial
larch forests planted after clear-cutting of mixed forest in Hokkaido, Japan.
The model was validated, scenarios were computed, and a sensitivity analysis
was performed. First, we performed a baseline simulation of carbon dynamics
and compared these values with those observed across a wide range of stand
ages (old mixed forest and young and middle-aged larch forests). Second, we
ran scenarios to investigate how disturbance and several climate factors
affect long-term carbon fluxes. Third, we analyzed the sensitivity of carbon
balance to the amount of disturbance-generated tree biomass residues. By
taking into account seasonal variation in the understory leaf area index,
which played an important role, especially in the initial stage of recovery,
the simulated net ecosystem production (NEP), gross primary production,
ecosystem respiration, and biomass for the three types of forest were
consistent with observed values (mean ± SD of R2 of monthly NEP,
GPP and RE for the three types of forest were 0.63 ± 0.26,
0.93 ± 0.07, 0.94 ± 0.2, respectively). The effect of
disturbances such as clear-cutting, land-use conversion, and thinning on the
long-term trend of NEP was larger than that of climate variation, even 50
years after clear-cutting. In contrast, interannual variation in the carbon
balance was primarily driven by climate variation. These findings indicate
that disturbance controlled the long-term trend of the carbon balance,
whereas climate factors controlled yearly variation in the carbon balance.
Among the meteorological factors considered, temperature and precipitation
were the main ones that affected NEP and its interannual variation. The
carbon balance in the initial post-disturbance period, which is strongly
affected by the amount of residues, influenced the subsequent long-term
carbon budget, implying the importance of residue management. Consequently,
carbon release just after disturbance and the length of the recovery period
required to balance the carbon budget are controlled by the amount of
residues. |
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