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            <gco:CharacterString>Pour calculer un indicateur de la déprise agricole, nous avons utilisé les données Corine Land Cover (CLC) de 1990 et 2018 (https://www.statistiques.developpement-durable.gouv.fr/corine-land-cover-0). D’une part, nous avons sélectionné les polygones de prairies et autres surfaces toujours en herbe à usage agricole (nomenclature CLC = 231), de pelouses et pâturages naturels (nomenclature CLC = 321) et de végétation clairsemée (nomenclature CLC = 333) en 1990. D’autre part, nous avons sélectionné les polygones de forêts de feuillus, de conifères et mélangées (nomenclature CLC = 311, 312 et 313) et les polygones de lande et broussailles (nomenclature CLC = 322), de végétation sclérophylle (nomenclature CLC = 323) et de forêt et végétation arbustive en mutation (nomenclature CLC = 324) en 2018. Nous avons ensuite fait le différentiel des polygones de 1990 et 2018 impliquant que les polygones résiduels étaient passés d’un état de surface herbacée (prairies, pelouses, pâturages etc.) à un état de forêt ou végétation arbustive (landes, broussailles, végétation sclérophylle etc.). Nous avons gardé les polygones supérieurs à 1 ha afin d’éliminer les effets de bordure. Finalement, nous avons calculé la proportion de surface occupée par les polygones résiduels au sein de chaque maille du maillage national de 10km par 10km de l’Inventaire National du Patrimoine Naturel (INPN, https://inpn.mnhn.fr/telechargement/cartes-et-information-geographique/ref/referentiels).</gco:CharacterString>
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