File:Fragmentation forestière ExFrance6régions KmRrouteParHa.jpg

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Français : Longueur par hectare d'infrastructures de voies de transport fragmentant les forêts (en km/ha) pour 6 régions de France, selon données IGN BDTopo 2011, IFN, INSEE, Corine Land Cover 2006. (information géographique pré-traitée pr J. Bonneau 2011 pour NaturParif (voir ci-dessus). Attention,
ce calcul ne retient que les principales voies , voies de service, transports urbains) et non les voies non exploitées et celles passant dans des tunnels ici considérées comme ne causant pas de fragmentation (en réalité les voies en tunnel et en activité posent éventuellement problème aux espèces cavernicoles qui se font tuer dans les tunnels par les trains ou véhicules ou sont gênées ou polluées par eux). Pour les routes, seules les voies carrossables sont prises en compte, c’est-à-dire les voies où la circulation en voiture est possible. Les chemins, sentiers, pistes cyclables et les voies passant dans les tunnels sont exclus, mais des pistes cyclables ou sentiers en "dur" ont en réalité un certain impact fragmentant (pour les espèces du sol notamment) . Il manque aussi les canaux dont les berges artificielles ou dont le caractère artificiel participent à la fragmentation des forêts quand ils les traversent.
English: Length (km) per hectare of infrastructures of transportation fragmenting french forests (km / ha) for six Regions of France, according to french database of IGN data BDTopo 2011, IFN, INSEE, Corine Land Cover 2006. (Geographic Information pretreated pr J. Bonneau 2011 for NaturParif (see above). Be carfeful with thoste data
this calculation keeps only the main roads, service roads, urban transport) and not the ways and those unexploited passing through tunnels considered here do not cause fragmentation (actually tracks activity in the tunnel and possibly pose problems for cave species that are killed in tunnels by trains or vehicles or polluted or are embarrassed by them). For roads, only roadways are taken into account, that is to say where the traffic channels drive is possible. Roads, trails, bike paths and lanes passing through tunnels are excluded, but bike paths or trails in "hard" actually have a fragmenting impact (for species of including ground). It also lacks the channels whose artificial banks or whose artificiality involved in forest fragmentation when they cross the
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Author Lamiot

See also Fragmentation forestière par les infrastructures de transport. En Île-de-France, selon l'IFN, 7 200 kilomètres d’infrastructures de transport par voies carrossables sillonnent les 269 000 hectares de forêt qui couvrent 22% du territoire de cette région densément peuplée.

Longueurs d’infrastructures de transport par ha de forêt (en km), pour 6 régions de France, selon données IGN BDTopo 2011, IFN, INSEE, Corine Land Cover 2006. (information géographique pré-traitée pr J. Bonneau 2011 pour NaturParif (voir ci-dessus).

See also (in french) "Fragmentation forestière" on French wikipedia

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