forestry. tree terms saw log- 6-8 inches for soft wood, 10-12 inches for hardwoods
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Forestry
Tree terms
Saw log- 6-8 inches for soft wood, 10-12 inches for hardwoods
Cut types
More Cut Types
• Selection cut- promotes uneven aged stands• Selective cut- removes oldest, most valuable
trees, bad for forest growth• Shelterwood retains 30-70% of canopy • Clear cutting is good for PA forests because it
allows sun loving trees like black cherry and oak to regenerate
Stand Types
Forest Structures
Fires• 98% ignited by humans, mostly burning debris
PA Forestry
• 30% of PA economy is based on forestry • 17 million Acres of forest cover, almost 60 % of the
State• Produces more than a billion board feet of hardwood
and three-quarters of a million cords of pulpwood• Most of PA white pine & hemlock forests cut by early
1900s• Now even aged mixed hardwoods • 90% of PA trees are hardwoods
Forest Affect on Water
• Incepts & infiltrates water• Trees Consume Storm Water • Removes Pollutants • Phytoremediation – examples trees in parking
lots • Riparian Buffers
Forestry Problems
• Skidding is the process of dragging logs from the stumps to a central location, called a log landing, where they are loaded onto trucks and transported to the mill.
• Log landings create large areas of unprotected, exposed soil
• Roads disturb soil, increase erosion • Sewage removal • Pesticide use
More facts
• Trees are plants that can reach at least 15 ft tall
• Forest is land with at least 10% trees
Forest Fragmentation • Increases spread of invasives• Decreases mobility and habitat size of natives
Mixed-oak forests
• Contain primarily the oaks; including northern red oak, chestnut oak, white oak, scarlet oak; along with the maples, yellow-poplar, ash, hickories, and miscellaneous deciduous species.
• The understory vegetation is mountain laurel and blueberry.
Northern hardwood forests
• Contain primarily black cherry, the maples, American beech, the birches
• Understory composition often comprised of ferns, striped maple and beech brush.
• Hemlock and eastern white pine are common to both forest types and both produce valuable wood products
Succession
Forest Types
• Forest Openings- herbaceous rather than woody growth; insects, small mammals
• Brush stage- small, dense, woody vegetation; browse and fruit, nesting cover
• Pole timber- less wildlife value, more timber value
• Mast/Mature timber- (mast is the fruit of woody plants) high protein and fat for animals,
Tree Types
• Large old- nesting cavities, roosting, mast• Snags and cavity- dead but standing, perches,
cavities• Evergreens- cover from cold and snow• Vines, shrubs, fruit- form understory• Riparian- form fish and wildlife habitats, act as
sponges
Special Habitats
• Wetlands- most productive, but least common in PA; greatest biodiversity
• Seep Springs- Snow free in winter, providing water and food
• Cliffs- secure nesting and unique habitats• Caves- shelter, nesting, and roosting
Biodiversity Levels
Factors the Increase Extinction
• Specializers • Sought by People• Rare• Codependent • Top of the Food Chain • Low Reproduction Rate