TAILIEUCHUNG - Báo cáo toán học: "EMILION, a tree functional-structural model: Presentation and first application to the analysis of branch carbon balance"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: EMILION, a tree functional-structural model: Presentation and first application to the analysis of branch carbon balance. | 555 Ann. For. Sci. 57 2000 555-569 INRA EDP Sciences Original article EMILION a tree functional-structural model Presentation and first application to the analysis of branch carbon balance Alexandre Bosc INRA Pierroton Station de Recherches Forestières Laboratoire d Ecophysiologie et Nutrition BP. 45 33611 Gazinet Cedex France Received 1 February 1999 accepted 30 September 1999 Abstract - This paper summarises the main characteristics of a new functional-structural ecophysiological model EMILION elaborated for pine species. It is based on the integration of the functioning of the tree aerial organs shoots buds and cones. It is founded on the modelling of carbon- and water- related processes at the organ level and on the links that exist between the organs. The main processes described by EMILION are light distribution and interception photosynthesis respiration stomatal conductance transpiration water transfer phenology and intra-annual growth. It uses an object-oriented approach. It has been parameterised and applied to adult Maritime pine Pinus pinaster Ait. . The model simulates the distribution in the tree of carbon and water fluxes at a short time step. The principal inputs are stand and tree structure and meteorological data. EMILION allows one to study the interaction of processes at the organ and tree level. An example application is presented in which EMILION was used to simulate the carbon budget of existing branches according to their age and location within the crown. This study was used to test one hypothesis of branch death that death is a consequence of an imbalance between branch assimilate production and use. Our results show that the old branches of Pinus pinaster are autonomous for the carbon but the ability of these branches to supply assimilates to rest of the tree appears very low. We conclude that this small carbon availability in the oldest branches is a cause of their limited development. Pinus pinaster functional-structural model .

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