Vezy R. auteur aut IRD Christina M. auteur aut IRD Roupsard O. auteur aut IRD Nouvellon Y. auteur aut IRD Duursma R. auteur aut IRD Medlyn B. auteur aut IRD Soma M. auteur aut IRD Charbonnier F. auteur aut IRD Blitz-Frayret C. auteur aut IRD Stape J. L. auteur aut IRD Laclau J. P. auteur aut IRD Virginio E. D. auteur aut IRD Bonnefond J. M. auteur aut IRD Rapidel B. auteur aut IRD Do Frédéric auteur aut IRD Rocheteau Alain auteur aut IRD Picart D. auteur aut IRD Borgonovo C. auteur aut IRD Loustau D. auteur aut IRD Le Maire G. auteur aut IRD text journalArticle eng text/pdf born digital access 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. specialized Partitioning Evapotranspiration Energy MAESPA Agroforestry system Process-based model 020 072 253 203-217 2018 0168-1923 https://www.documentation.ird.fr/hor/fdi:010072773 10.1016/j.agrformet.2018.02.005 0168-1923 [F B010072773] https://www.documentation.ird.fr/hor/fdi:010072773 https://www.documentation.ird.fr/intranet/publi/2018/05/010072773.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2018-06-01 2023-07-11 fdi:010072773 fre