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>> Prenez part au recensement de l'ambroisie en Franche-Comté : Signalez vos observations
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Répartition nationale
Répartition régionale
Ecologie
Remarques
L'ambroisie est présente dans presque toute la France mais est surtout présente dans les bassins du Rhône et de la Loire où elle est très répandue. Ailleurs, elle est assez fréquente dans la plaine jurassienne, la Saône-et-Loire et en Charente ; elle est très disséminée dans le Sud-Ouest, l’Ouest, le Bassin parisien, le Nord-Est, rare dans l'extrême nord du pays et quasi absente des massifs montagneux au dessus de 700 m d'altitude : Pyrénées, Alpes, Massif-Central, Jura et Vosges.
L'espèce colonise la région par le sud-ouest. Elle est actuellement connue de 420 communes mais est en constante expansion. Elle est très répandue dans la Bresse comtoise, le Finage, la région de Dole et répandue en Petite Montagne, dans la vallée de l’Ain en aval de Charézier, la vallée de la Bienne, le Revermont et le Vignoble. Elle remonte ensuite de manière plus disséminée la vallée du Doubs et la bordure du massif du Jura pour atteindre le pays de Montbéliard et le Territoire de Belfort. Elle est pour l’instant très disséminée plus au nord dans toute la vallée de l'Ognon, puis à Champlitte, Grandecourt, Quincey, Augicourt, Aboncourt-Gesincourt, Faverney, dans les régions de Luxeuil-les-Bains et de Lure, ainsi que dans le massif vosgien à Amont-et-Effreney, Faucogney-et-la-Mer, Fresse et Grosmagny. Elle pénètre dans le massif du Jura via les principaux axes routiers et les vallées de l’Ain et de la Bienne. Elle, est actuellement disséminée sur les premiers plateaux du Jura et atteint Septmoncel, les Molunes, le Grandvaux, le plateau des lacs, Champagnole, Censeau, Ouhans et Morteau.
Historiquement, elle est citée dans le Territoire-de-Belfort à Giromagny en 1913 (Plubel).
L'ambroisie est une plante héliophile se développant de l'étage planitiaire à l'étage montagnard sur des sols assez secs, riches en bases et plutôt riches en nutriments. C'est une plante des terrains perturbés fréquentant les sédiments alluvionnaires des lits mineurs des rivières, les bermes routières, les friches industrielles, les chantiers, les jachères, les cultures et notamment celles de maïs et de tournesol. Elle fréquente plus particulièrement :
 
-       les communautés des zones de dépôts d’alluvions grossiers des bords du lit mineur des rivières (Saponario officinalis – Elytrigietum repentis) ;
-       communautés héliophiles des grèves de galets et de sables du lit mineur des rivières calmes relevant du Bidenti tripartitae – Brassicetum nigrae ;
-       friches plus ou moins thermophiles de hautes herbes sur substrat grossier et souvent rapporté (Dauco carotae – Melilotion albi) ;
L'ambroisie est originaire d'Amérique-du-Nord. Elle a été introduite en France pour la première fois dans l'Allier en 1863 avec des semences de légumineuses fourragères. Elle s'est ensuite propagée dans les vallées de la Loire et du Rhône à partir desquelles elle étend son aire de répartition aujourd'hui. En plus, d’impacter négativement les écosystèmes et d’être très allergisante, elle est également nuisible aux cultures.
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                                            [message] => Recursion detected.
                                            [array_path] => field_type.0.entity.feeds_item.0.entity
                                        )

                                )

                        )

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                )

        )

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        (
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                        (
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                                (
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                                )

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                            [langcode] => Array
                                (
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                                        (
                                            [value] => fr
                                        )

                                )

                            [vid] => Array
                                (
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                                        (
                                            [target_id] => type_d_habillage
                                            [message] => Recursion detected.
                                            [array_path] => field_fiche_espece.0.entity.field_type_affichage.0.entity.vid.0.entity
                                        )

                                )

                            [revision_created] => Array
                                (
                                    [0] => Array
                                        (
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                                        )

                                )

                            [revision_user] => Array
                                (
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                            [revision_log_message] => Array
                                (
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                            [status] => Array
                                (
                                    [0] => Array
                                        (
                                            [value] => 1
                                        )

                                )

                            [name] => Array
                                (
                                    [0] => Array
                                        (
                                            [value] => Espace Documentation
                                        )

                                )

                            [description] => Array
                                (
                                    [0] => Array
                                        (
                                            [value] => 
                                            [format] => 
                                        )

                                )

                            [weight] => Array
                                (
                                    [0] => Array
                                        (
                                            [value] => 5
                                        )

                                )

                            [parent] => Array
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                                )

                            [changed] => Array
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                                        )

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                            [default_langcode] => Array
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                            [revision_translation_affected] => Array
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                                        (
                                            [value] => 1
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                            [metatag] => Array
                                (
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                            [path] => Array
                                (
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                                        (
                                            [alias] => /type-dhabillage/espace-documentation
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                                        )

                                )

                            [feeds_item] => Array
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                                            [message] => Recursion detected.
                                            [array_path] => field_fiche_espece.0.entity.field_type_affichage.0.entity.feeds_item.0.entity
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                                )

                            [field_image_section] => Array
                                (
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                                            [target_id] => 1284
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                                            [title] => 
                                            [width] => 2452
                                            [height] => 445
                                            [entity] => Array(11)
                                            [bundle] => file
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                                )

                            [field_titre_html] => Array
                                (
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                        )

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        (
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)