. Une analyse des ressources forestières de la Pennsylvanie. Les forêts et la foresterie en Pennsylvanie ; gestion des forêts en Pennsylvanie. Le plus apprécié de Classe 1 Classe 3 chêne châtaignier chêne blanc Aulne American bass- Classe 2 Bois Peuplier à grandes dents Apple chêne noir bouleau gris bouleau à papier chêne rouge du Nord Post Oak Chêne écarlate tremble Classe Intermédiaire 4 hêtre américain American chestnut fleur de cornouiller orme d'Amérique American hackberry hornbean Hickory Black cherry pitchpin Blackgum Red Maple noyer noir noyer commun pin rouge Sassafras persim- orme érable à sucre mon Table-Mountain Cucumbertree ourlet de l'Est

• Contributeur: Library Book Collection / Alamy Banque D'Images
• ID de l’image: RNAJJ5
• Taille du fichier: 7,1 MB (153,8 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1694 x 1474 px | 28,7 x 25 cm | 11,3 x 9,8 inches | 150dpi

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. An analysis of Pennsylvania's forest resources. Forests and forestry Pennsylvania; Forest management Pennsylvania. Most preferred Class 1 Class 3 Chestnut oak Alder White oak American bass- wood Class 2 Apple Bigtooth aspen Black oak Gray birch Northern red Paper birch oak Post oak Scarlet oak Quaking aspen Intermediate Class 4 American beech Flowering American chestnut dogwood American elm Hackberry American hornbean Hickory Black cherry Pitch pine Blackgum Red maple Black walnut Red pine Butternut Sassafras Common persim- Slippery elm mon Sugar maple Cucumbertree Table-Mountain Eastern hemlock pine Eastern hop- Virginia pine hornbean Witch-hazel Least preferred Class 5 Black locust Eastern red- cedar Red spruce Scotch pine White ash Yellow-poplar Such opportunities obviously are not appropriate for extensive tracts of oak, especially since many sites are particularly well suited to grow- ing oak. In such instances, maintain- ing good stocking and normal distri- bution of age classes, removing sup- pressed and overmature oaks, devel- oping a ground cover of seedlings, and protecting against fire and graz- ing should lessen adverse impacts from the gypsy moth. Sometimes there is little the landowner can do to reduce mortality on his or her forest land. If the area should sustain heavy mortality and there are markets available, salvaging the dead material before it becomes unusable will allow at least some- thing to be recouped from the loss. There may be difficulties where ac- cess to dead material is inadequate or where the dead material is scat- tered throughout the stand. However, where possible, salvage is an impor- tant timber management practice that merits consideration. Much research has been con- ducted on the silviculture (the devel- opment and care of forests) of oak/hickory, Allegheny hardwood (cherry/maple), and northern hard- wood forests (Roach and Gingrich 1968; Sander 1978; Marquis et al. 1975; Roach 1977; Marquis 1979; Ben- nett and Armstrong 198

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