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| Titel |
Effects of vegetation structure on biomass accumulation in a Balanced Optimality Structure Vegetation Model (BOSVM v1.0) |
| VerfasserIn |
Z. Yin, S. C. Dekker, B. J. J. M. van den Hurk, H. A. Dijkstra |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 3 ; Nr. 7, no. 3 (2014-05-12), S.821-845 |
| Datensatznummer |
250115617
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| Publikation (Nr.) |
 copernicus.org/gmd-7-821-2014.pdf |
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| Zusammenfassung |
| A myriad of interactions exist between vegetation and local climate
for arid and semi-arid regions. Vegetation function, structure and
individual behavior have large impacts on carbon–water–energy
balances, which consequently influence local climate variability
that, in turn, feeds back to the vegetation. In this study, a
conceptual vegetation structure scheme is formulated and tested in
the new Balanced Optimality Structure Vegetation Model (BOSVM) to
explore the importance of vegetation structure and vegetation
adaptation to water stress on equilibrium biomass states. Surface
energy, water and carbon fluxes are simulated for a range of
vegetation structures across a precipitation gradient in West Africa
and optimal vegetation structures that maximize biomass for each
precipitation regime are determined. Two different strategies of
vegetation adaptation to water stress are included. Under dry
conditions vegetation tries to maximize the water use efficiency and
leaf area index as it tries to maximize carbon gain. However, a
negative feedback mechanism in the vegetation–soil water system is
found as the vegetation also tries to minimize its cover to optimize
the surrounding bare ground area from which water can be extracted,
thereby forming patches of vertical vegetation. Under larger
precipitation, a positive feedback mechanism is found in which
vegetation tries to maximize its cover as it then can reduce water
loss from bare soil while having maximum carbon gain due to a large
leaf area index. The competition between vegetation and bare soil
determines a transition between a "survival" state to a
"growing" state. |
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