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| Titel |
Contributions of Primary and Secondary Forests, and Nitrogen Dynamics to Terrestrial Carbon Uptake |
| VerfasserIn |
Atul Jain, Bassil El-Masri, Shijie Shu |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100458
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| Publikation (Nr.) |
 EGU/EGU2014-16427.pdf |
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| Zusammenfassung |
| Historically, land use change (LUC), such as the conversion of forests to croplands and
pasturelands, has generally released C to the atmosphere due to the burning of forest biomass
and subsequent decomposition of the dead organic matter. In recent decades, C stocks in
forest ecosystems have increased through reforestation, afforestation and forest regrowth on
abandoned land. However, the accumulation of C in regrowing forests can be constrained if
the regrowth of forest occurs in N limited regions or enhanced if the additional N is
deposited in the forest regrowing regions. While the C sinks associated with regrowth of
forest are commonly simulated within terrestrial C cycle models, the impacts of N
limitations and N deposition on the C sink associated with regrowing primary and
secondary forests have often not been considered. The objectives of this presentation
are to use the Integrated Science Assessment Model (ISAM), which couples the
terrestrial C and N cycles for global change assessments, to examine the nitrogen
limitation in global primary and secondary forests from historical LUCs and the
interactions between LUCs and N deposition. This study presents several crucial
updates on multiple fronts, in particular, a use of fully coupled biogeophysical and
carbon-nitrogen (C-N) cycle component of the ISAM, incorporating the impact of
N limitation and N deposition on the GPP, NPP and associated with primary and
secondary forest regrowth including the effects of wood harvest activities, a use of
the most recent satellite data for LUC, and extending the estimates until the year
2012. |
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