20 research outputs found
Une forĂȘt mĂ©diterranĂ©enne et des territoires ruraux mieux gĂ©rĂ©s pour diminuer les risques d'incendie
A l'occasion de la publication du n°100 de la revue ForĂȘt MĂ©diterranĂ©enne, il a Ă©tĂ© demandĂ© aux grandes institutions nationales qu'elles nous prĂ©sentent leur vision des espaces forestiers mĂ©diterranĂ©ens "depuis Paris". Cet article nous donne le regard portĂ© par le MinistĂšre chargĂ© des ForĂȘts (Sous-Direction de la forĂȘt et du bois) sur la forĂȘt mĂ©diterranĂ©enne
Does the type of silvicultural practice influence spruce budworm defoliation of seedlings?
Spruce budworm (Choristoneura fumiferana (Clem)) is the main defoliator in the boreal forest of North America, and its outbreaks have major ecological and economic consequences and represent a challenge for forest management. Numerous studies have addressed the effects of this defoliator on mature trees, whereas the effects of spruce budworm on regeneration remain elusive. Furthermore, intensive exploitation practices during the last decades have left a large area of the Canadian boreal forest in an early development stage. In this context, it becomes vital to understand those factors affecting the severity of spruce budworm-related defoliation on regeneration. Here, we determine the defoliation severity of black spruce and balsam fir seedlings in both mature pure black spruce and black spruce-balsam fir stands subjected to two different silvicultural treatments (clear-cutting and partial cutting). Defoliation intensity varied between stand types, silvicultural treatments, species, and height classes. Seedlings in black spruce-balsam fir stands experienced twice the defoliation of those in pure black spruce stands (black spruce seedlings 10% vs. 23%; balsam fir seedlings 29% vs. 47%, respectively). Harvesting methods also influenced seedling defoliation. Under clear-cutting, black spruce seedlings (24%) were three times as defoliated as black spruce seedlings in partial cutting stands (8%), whereas balsam fir seedlings in clear-cutting plots experienced twice the defoliation (42%) of balsam fir seedlings in partial cutting plots (20%). The level of defoliation also increased with seedling height. This study will help silvicultural strategies adapt to the effects of natural disturbance regimes. As the intensity and severity of defoliator outbreaks are expected to increase under climate change, these results will help guide forest management strategies to select harvesting methods that will limit the effects of defoliation on conifer regeneration
Use of Mangroves by Lemurs
Despite an increasing recognition of the ecosystem services provided by mangroves, we know little about their role in maintaining terrestrial biodiversity, including primates. Madagascarâs lemurs are a top global conservation priority with 94 % of species threatened with extinction, but records of their occurrence in mangroves are scarce. I used a mixed-methods approach to collect published and unpublished observations of lemurs in mangroves: I carried out a systematic literature search, and supplemented this with a targeted information request to 1243 researchers, conservation and tourism professionals and others who may have visited mangroves in Madagascar. I found references to, or observations of, at least 23 species in five families using mangroves, representing more than 20 % of lemur species and over 50 % of species whose distributions include mangrove areas. Lemurs used mangroves for foraging, sleeping and travelling between terrestrial forest patches, and some were observed as much as 3 km from the nearest permanently dry land. However most records were anecdotal and thus tell us little about lemur ecology in this habitat. Mangroves are more widely used by lemurs than has previously been recognised, and merit greater attention from primate researchers and conservationists in Madagascar
Les ForĂȘts du Maroc.
Direction des Eaux et ForĂȘts du Maroc. Les ForĂȘts du Maroc.. In: Revue de botanique appliquĂ©e et d'agriculture coloniale, 7á” annĂ©e, bulletin n°73, septembre 1927. pp. 588-592
Liste des principales usines hydrauliques de la région des Alpes, en 1916
MinistĂšre de lâAgriculture - Direction gĂ©nĂ©rale des eaux et forĂȘts. Liste des principales usines hydrauliques de la rĂ©gion des Alpes, en 1916. In: DeuxiĂšme congrĂšs de la Houille blanche, Lyon, septembre 1914. Rapports qui devaient ĂȘtre prĂ©sentĂ©s au congrĂšs. Tome 2, 1914
Les ventes de bois des forĂȘts publiques en 2022
Dans un contexte Ă©conomique trĂšs dynamique et complexe, et malgrĂ© une moindre mobilisation en volume, le chiffre dâaffaires bois des forĂȘts publiques de mĂ©tropole dĂ©passe 661 millions dâeuros en 2022, avec un prix moyen apparent accru de 36 % (59,9 ⏠par m3). Le prix du ChĂȘne progresse fortement, tirĂ© davantage par le merrain que par les autres qualitĂ©s, comme celui des rĂ©sineux blancs nĂ©anmoins affectĂ© Ă lâautomne par la baisse du marchĂ© de la construction. Le secteur merrain valorise la futaie rĂ©guliĂšre de ChĂȘne dont les savoirs et savoir-faire viennent dâĂȘtre inventoriĂ©s au Patrimoine culturel immatĂ©riel (PCI) de la France en juin 2022. Le HĂȘtre et les Pins bĂ©nĂ©ficient Ă©galement de hausse, ainsi que le bois Ă©nergie. 40 % des volumes vendus sont fournis en contrats dâapprovisionnement, en progression de 5 %.
Messages clés :
⹠En 2022, le contexte a été trÚs dynamique bien que complexe.
⹠Le prix moyen du m3 a augmenté de 36 %.
⹠Le secteur merrain et bois énergie ont été particuliÚrement en hausse.
âą La vente en contrat dâapprovisionnement a augmentĂ© de 5 %
QuĂ©bec (Province). MinistĂšre des forĂȘts. Direction de la recherche : dossier secondaire 847 /
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