Land Use: Forests, Rangelands, Parks and Wildernessparksandreserves.pdf• 54 National Parks and 316...
Transcript of Land Use: Forests, Rangelands, Parks and Wildernessparksandreserves.pdf• 54 National Parks and 316...
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Land Use: Forests, Rangelands, Parks and
Wilderness
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World Land Use
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Types of Protected Lands in U.S.• Multiple-use lands
– National Forest (U.S.F.S.)• sustainable yield• multiple use• used for logging, mining, grazing, farming, oil,
recreation, hunting and conservation
– National Resource lands (BLM)• mostly in west and Alaska• multiple use• used for mineral and oil extraction/ grazing
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Types of Protected Lands
• Moderately Restricted-Use Lands– National Wildlife Refuges (USFWS)
• 508 refuges• 24% designated as wilderness• protect habitats• oil, farming, hunting, mineral extraction are allowed
as long as D of I says OK
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Types of Protected Lands
• Restricted-Use lands– National Park System (NPS)
• 54 National Parks and 316 recreation areas, battlefields, memorials, etc.
• Preserve and interpret the country’s historic and cultural heritage and protect wilderness areas
• Parks:can be used for camping, hiking, fishing and boating
• Rec areas: also mining and oil• 49% of National Park system is wilderness
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Types of Protected Lands
• Restricted-Use lands– National Wilderness Preservation System
(NPS, USFWS, USFS)• 474 roadless areas in National Parks, wildlife
refuges and national forests• Are preserved untouched for everyone to enjoy later• used for hiking, fishing, camping, non-motorized
boating, hunting, horseback riding• roads, grazing, mining, buildings are prohibited
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Locations of Parks, Preserves, Forests and Refuges
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Forest Management • Most of the world’s forests are managed for
paper and wood production• Paper production uses short rotation• Old-growth wood for furniture requires long
rotation
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Types of Forest Management
• Even-aged management– forest is cut down, and regrowth trees are
maintained at the same size and age– monoculture– industrial forestry– high industrial productivity low biodiversity
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Types of Forest Management
• Uneven-aged management– variety of tree species are maintained at
different sizes and ages– fosters natural regeneration– high diversity– long term production of high quality timber
• Strategy decision is based upon return timetable of money required
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Tree Harvesting
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If you were a trying to cut the trees in a forest, what
strategy would you employ?
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Strategy 1: Selective Cutting
intermediate-aged or old trees are cut
maintains uneven-aged stand
industry people say it is not profitable
can be destructive because many trees can be killed by removing a few large ones
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Strategy 2: Shelterwood - Cutting
mature trees are removed in 2-3 cuts leaving even aged stand
natural looking forest that can be used for recreation
can be a good habitat for wildlife
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Strategy 3: Seed-tree Cutting
harvests most of a stand’s trees in one cutting
leaves a few remaining trees to re-seed the site
after new trees are established, remaining adults are taken
allows several species
good for wildlife and recreation
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Strategy 4: Clear-cutting
all trees are removed at once
site is artificially re-seeded
requires less money, skillhigh return
eliminates recreational and wildlife use
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Strategy 5: Strip cuttinga strip of trees is removed that is narrow enough to be naturally
re-seededthe next year, a new strip is cut; etc.forest is clear-cut over a decade or so will much less damage
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Strategy 5: Whole-tree harvesting
the entire tree, including roots are brought to plants and chopped into wood chips
most destructive methods, because it removes all plants materialand most associated organisms
removes nutrients from soil
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How are fires important in forest management?
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Fires
• Pros– many plant species require fires for seedling
generation– destruction of old trees, providing light gaps,
encourages growth of young trees– regrowth provides food for herbivores
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Fires
• Cons– can be destructive to huge plots of land and
animal plant species– can threaten structures– can accelerate erosion
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Fire Policy• Prevention, Prescribed burns, Suppression• Historically, all fires have been suppressed
– this caused the build-up of dead plant material– when fires erupted they were severe– Smokey the Bear was not a good idea
• Since 1972 most natural fires have been allowed to burn– natural process of regeneration– Yellowstone fires is causing people to think
about reversing the policy
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Threats to forests• Pathogens and insects• Air pollution and Climate Change• Harvesting
– wood• although per capita wood use is less, population is
growing faster than decrease.• regulations greatly support logging
– but, forests are generally healthier than they have been (depending on whose definition of health.)
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Managing Rangelands• Definition
– lands that provide foraging material for grazing animals– usually in areas to dry for irrigation– 42% is used for grazing livestock– 34% of U.S. land is rangeland
• 84% of mammals species• 74% of bird species
– Threats• overgrazing, destruction to riparian habitats• huge subsidies• read about coyotes and sheep
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Managing National Parks• Established in the U.S. in 1912, most in West• Threats
– not enough money to maintain them – many are too small to support large species– increased people visiting parks (500mil by 2010)– non-native species brought in– human activities on adjacent lands– air pollution
• To do:– use all fees for management– refocus attention on preserving habitat
• read about everglades
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Managing Other Wilderness Areas
• Definition– areas that are undisturbed by humans activities– should be at least 1,500 square miles
• so that it is not affected by pollution, drilling, forestry and urban development
– 34% of the earth’s surface• 30% of them are forests• only 20% are protected
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Wilderness Areas
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Solutions: Biosphere reserves
• Core area - no disturbance• buffer zone - managed activities• transition zone - sustainable forestry and
conservation
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Establishing Reserves