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| Titel |
MAESPA: a model to study interactions between water limitation, environmental drivers and vegetation function at tree and stand levels, with an example application to [CO2] × drought interactions |
| VerfasserIn |
R. A. Duursma, B. E. Medlyn |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2012-07-05), S.919-940 |
| Datensatznummer |
250002764
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| Publikation (Nr.) |
 copernicus.org/gmd-5-919-2012.pdf |
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| Zusammenfassung |
| Process-based models (PBMs) of vegetation function can be used to interpret
and integrate experimental results. Water limitation to plant carbon uptake
is a highly uncertain process in the context of environmental change, and
many experiments have been carried out that study drought limitations to
vegetation function at spatial scales from seedlings to entire canopies.
What is lacking in the synthesis of these experiments is a quantitative tool
incorporating a detailed mechanistic representation of the water balance
that can be used to integrate and analyse experimental results at scales of
both the whole-plant and the forest canopy. To fill this gap, we developed
an individual tree-based model (MAESPA), largely based on combining the
well-known MAESTRA and SPA ecosystem models. The model includes a
hydraulically-based model of stomatal conductance, root water uptake
routines, drainage, infiltration, runoff and canopy interception, as well as
detailed radiation interception and leaf physiology routines from the
MAESTRA model. The model can be applied both to single plants of arbitrary
size and shape, as well as stands of trees. The utility of this model is
demonstrated by studying the interaction between elevated [CO2]
(eCa) and drought. Based on theory, this interaction is generally
expected to be positive, so that plants growing in eCa should be less
susceptible to drought. Experimental results, however, are varied. We apply
the model to a previously published experiment on droughted cherry, and show
that changes in plant parameters due to long-term growth at eCa
(acclimation) may strongly affect the outcome of Ca × drought
experiments. We discuss potential applications of MAESPA and some of the key
uncertainties in process representation. |
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