%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Vezy, R.
%A Christina, M.
%A Roupsard, O.
%A Nouvellon, Y.
%A Duursma, R.
%A Medlyn, B.
%A Soma, M.
%A Charbonnier, F.
%A Blitz-Frayret, C.
%A Stape, J. L.
%A Laclau, J. P.
%A Virginio, E. D.
%A Bonnefond, J. M.
%A Rapidel, B.
%A Do, Frédéric
%A Rocheteau, Alain
%A Picart, D.
%A Borgonovo, C.
%A Loustau, D.
%A Le Maire, G.
%T Measuring and modelling energy partitioning in canopies of varying complexity using MAESPA model
%D 2018
%L fdi:010072773
%G ENG
%J Agricultural and Forest Meteorology
%@ 0168-1923
%K Partitioning ; Evapotranspiration ; Energy ; MAESPA ; Agroforestry system ; Process-based model
%M ISI:000430783800018
%P 203-217
%R 10.1016/j.agrformet.2018.02.005
%U https://www.documentation.ird.fr/hor/fdi:010072773
%> https://www.documentation.ird.fr/intranet/publi/2018/05/010072773.pdf
%V 253
%W Horizon (IRD)
%X Evapotranspiration and energy partitioning are complex to estimate because they result from the interaction of many different processes, especially in multi-species and multi-strata ecosystems. We used MAESPA model, a mechanistic, 3D model of coupled radiative transfer, photosynthesis, and balances of energy and water, to simulate the partitioning of energy and evapotranspiration in homogeneous tree plantations, as well as in heterogeneous multi-species, multi-strata agroforests with diverse spatial scales and management schemes. The MAESPA model was modified to add (1) calculation of foliage surface water evaporation at the voxel scale; (2) computation of an average within-canopy air temperature and vapour pressure; and (3) use of (1) and (2) in iterative calculations of soil and leaf temperatures to close ecosystem-level energy balances. We tested MAESPA model simulations on a simple monospecific Eucalyptus stand in Brazil, and also in two complex, heterogeneous Coffea agroforests in Costa Rica. MAESPA satisfactorily simulated the daily and seasonal dynamics of net radiation (RMSE = 29.6 and 28.4 W m(-2); R-2 = 0.99 and 0.99 for Eucalyptus and Coffea sites respectively) and its partitioning between latent-(RMSE = 68.1 and 37.2 W m(-2); R-2 = 0.87 and 0.85) and sensible-energy (RMSE = 54.6 and 45.8 W m(-2); R-2 = 0.57 and 0.88) over a one-year simulation at half-hourly time-step. After validation, we use the modified MAESPA to calculate partitioning of evapotranspiration and energy between plants and soil in the above-mentioned agro-ecosystems. In the Eucalyptus plantation, 95% of the outgoing energy was emitted as latent-heat, while the Coffea agroforestry system's partitioning between sensible and latent-heat fluxes was roughly equal. We conclude that MAESPA process-based model has an appropriate balance of detail, accuracy, and computational speed to be applicable to simple or complex forest ecosystems and at different scales for energy and evapotranspiration partitioning.
%$ 020 ; 072