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The PAYSAGRI model: from agricultural plot to landscape

Depigny S., Poix C., Chevillot B.. 2005. In : Conference on Multi-agent modelling for environmental management, Bourg Saint Maurice - Les Arcs, France, 21-25 mars 2005. Bourg-Saint-Maurice : s.n., 2 p.. Colloque CABM-HEMA-SMAGET 2005, 2005-03-21/2005-03-25, Bourg-Saint-Maurice (France).

Nowadays, social reorganization of rural territories is topical issue. More and more people, who don't belong to agricultural corporations, live on these territories. This phenomenon creates some disagreements. On the one hand, new residents think that landscape is only their living environment. According to them, landscape must be suitable for hobbies. New residents wish this landscape not to evolve. On the other hand, farmers don't understand these new expectations, which sometimes contradictory their activity. This situation results from a lack of knowledge about the processes of landscape evolution. For agronomist point of view, these processes are deeply linked to agricultural system changes. One cannot see landscape just as a picture of a territory, but more as the result of economic activities. The main objective of our model is to clarify and to explain relationships between public policies, agricultural system changes and landscape changes. Two stages are necessary for this modelling. Firstly, we must understand how public policies are applied and how these policies change strategies of agricultural systems. Secondly, we try to assess landscape evolutions, which are due to the reorganization of agricultural systems. Our modelling is based on medium altitude areas where the main part of land is managed by agricultural systems. The Paysagri model is based on three concepts: The landscape is the measured variable. Considering geoagronomy, landscape can be seen as a puzzle made of many pieces. According to this point of view, each piece is both a component and a consequence of a sociological and economical system. In our model, landscape is a puzzle made of all agricultural plots of the studied territory. The plot is the elementary object in the model. That's why it is assumed homogeneous; i.e. the model doesn't handle phenomena that occur inside the plot. We keep the only information that is essential for the farmer's decisions. Texture and age characterize a

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