Reference : Refining the outputs of a dynamic vegetation model (CARAIB):Research at ULiège, Belgium
Scientific conferences in universities or research centers : Scientific conference in universities or research centers
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/236208
Refining the outputs of a dynamic vegetation model (CARAIB):Research at ULiège, Belgium
English
Hambuckers, Alain mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale >]
Paillet, Marc [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques >]
Henrot, Alexandra-Jane mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques >]
Trolliet, Franck [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques >]
Cheddadi, Rachid mailto []
Fettweis, Xavier mailto [Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie >]
El Hasnaoui, Yassine mailto []
Dury, Marie mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Porteman, Kristof [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > > >]
François, Louis mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques >]
19-Mar-2019
National
Séminaire à l'UNESP
19 mars 2019
Prof. I.A. Guerrini, C.L. Marino, J.R. de Souza Passos
Botucatu
Brazil
[en] dynamic vegetation model ; traits ; acclimation
[en] Dynamic vegetation models (DVMs) are process-based models combining the inputs and the outputs of sub-models, possibly in feedback loops, to simulate the plant functions. The sub-models compute conditions outside and inside the plant and physiological reactions from the environmental data (climate, light intensity, air CO2 concentration, soil properties). DVMs are tools of choice to predict the future and the past of the vegetation taking into account climatic variations. The emergence of new questions in the context of climate change, particularly on threatened species or on commercial species, compels to apply DVMs to species while the information to parameterize and validate them is largely lacking. Of particular importance are the morpho-physiological traits. These were intensively studied within the hypothesis that they could be used to predict plant performances. This hypothesis finally revealed not very suitable, but it brought to light that important traits controlling photosynthesis and water relationships could strongly vary within each species in response to environmental conditions.
We studied the Atlas cedar (Cedrus atlantica (Endl.) Manetti ex Carrière), in Morocco (northern Africa). It is a threatened tree species of important economic value. We also studied the English oak (Quercus robur L.) and the sessile oak (Quercus petraea (Matt.) Liebl.) in eastern Belgium. In a series of localities, we determined several traits (specific leaf area, leaf C/N, sapwood C/N, as well as for the cedar, leaf longevity) and we assessed biomass and net primary productivity as validation data, thanks to forest inventories, dendrochronology analyses and allometric equations combined with leaf area index estimations. We compared the model simulations of the CARAIB DVM when varying the set of traits (direct site estimates or default values) to the field estimates of biomass and net primary productivity. We found that trait default values provide sufficient information for the DVM to compute mean output values but low ability to reproduce between site variations. On the contrary, the in situ traits improve drastically this ability, which indicates that the plant performances are the results of acclimation to the evolving local environmental conditions.
Fédération Wallonie Bruxelles. Fonds de la Recherche Scientifique - F.R.S.-FNRS
Vulnérabilité des populations d'arbres montagnards des régions tropicales et tempérées chaudes sous des scénarios extrêmes (VULPES-ULg) / Vulnerability of tropical and warm temperate mountain tree populations under extreme scenarios (VULPES-ULg)
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/236208

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