Land%20Resources

1
Land Resources
Chapter 18
2
Land Use

• World Land Use

3
Land Use

• Land Use in the US

4
Land Use

• Federally managed land

5
Land Use

• Administration of Federal Lands

6
Land Use

• Managing Public and Private Land
• Public Planning of Land Use
• Development planning should be comprehensive
• Consider housing, businesses, agricultural,
  undeveloped, etc.

7
Land Use

• Management of Federal Lands
• Wise-Use Movement vs. Environmental Movement

Managing Public and Private Land
8
Wilderness, Parks, and Wildlife Refuges

• Wilderness
• Land completely set aside no development
  permitted (no roads)

9
Wilderness, Parks, and Wildlife Refuges

• National Parks
• Land set aside for recreation and preservation
• (limited development permitted, such as roads)

10
Wilderness, Parks, and Wildlife Refuges

• National Parks
• Most popular

11
Wilderness, Parks, and Wildlife Refuges

• National Parks
• Threats to US Parks

12
Wilderness, Parks, and Wildlife Refuges

• National Parks
• Natural Regulation

Letting nature take its course Fires not
controlled (unless buildings threatened) Animals
not culled (except invasive)
13
Wilderness, Parks, and Wildlife Refuges

• National Parks
• A Representative National Park in Africa
• World Wildlife Fund, Cameroon government, and
  other agencies managing Korup National Park

14
Wilderness, Parks, and Wildlife Refuges

• Wildlife Refuges
• Lands managed for conservation of fish,
  wildlife, and plants
• Recreation (including hunting and fishing) are
  permitted if such activities do not impede
  conservation efforts

15
Forests

• Role of forests in the hydrologic cycle

16
Forests

• Forest Management
• Traditional forest management vs.Ecologically
  sustainable forest management

• Typical tree plantation
• Monoculture
• Heavy use of pesticides
• Very low biological diversity

17
Forests

• Forest Management
• Harvesting Trees

18
Forests

• Forest Management
• Harvesting Trees

19
Forests

• Forest Management
• Harvesting Trees

Seed tree cutting
20
Forests
http//www.bidder70.org/

• Deforestation
• World forests shrinking by 22 million acres
  each year
• Many causes (drought, agricultural expansion,
  construction, tree harvest, etc.)
• Results in soil infertility, warmer climates,
  disrupted hydrologic cycle

http//www.democracynow.org/2008/12/22/posing_as_a
_bidder_utah_student
21
Forests

• Forest Trends in the US

22
Forests

• Forest Trends in the US
• US National Forests

Managed for multiple uses (hunting, mining,
recreation, timber harvesting, etc.)
23
Forests

• Forest Trends in the US
• US National Forests
• Case-in-Point Tongass National Forest

http//en.wikipedia.org/wiki/Roadless_area_conserv
ation
24
Forests

• Trends in Tropical Forests

25
Forests

• Why Are Tropical Forests Disappearing?

26
Forests

• Why Are Tropical Forests Disappearing?

• Subsistence Agriculture
• Commercial Logging
• Cattle Ranching and Agriculture for Export

27
Forests

• Why Are Tropical Dry Forests Disappearing?

28
Forests

• Boreal Forests and Deforestation

29
Rangelands and Agricultural Lands

• Rangelands

30
Rangelands and Agricultural Lands

• Rangeland Degradation and Desertification
• Many rangelands consistently overgrazed
• Overgrazing coupled with extended droughts
  desertification
• Worldwide desertification rate 1,374 mi2 per
  year

31
Rangelands and Agricultural Lands

• Rangeland Trends in the US
• Rangelands comprise 30 of land in US
• 1/3rd public, 2/3rd private
• Issues Involving Public Rangelands
• Grazing permit fees
• Wild horses and burros

32
Rangelands and Agricultural Lands

• Agricultural Lands
• US has 300 million acres of prime farmland
• Main problem suburban spread onto agricultural
  land

33
Wetlands and Coastal Areas

• Wetlands

34
Wetlands and Coastal Areas

• Human activities that threaten wetlands
• Draining for agriculture or mosquito control
• Dredging for navigation
• Channelization
• Construction of dams, sea walls, dykes
• Filling in for solid waste disposal, roads,
  residential / industrial development
• Conversion to aquaculture

35
Wetlands and Coastal Areas

• US legislation has attempted to maintain a no
  net loss of wetlands

Reconstructed wetland in San Diego
36
Wetlands and Coastal Areas

• Coastlines
• Severely degraded or destroyed in US by filling
  and draining
• Residential and industrial development common
• Resulting problems

37
Wetlands and Coastal Areas

• Coastlines
• Coastal Demographics

• In US, 19 of 20 most densely populated areas
  along coast.
• Worldwide, coastal management plans rarely
  integrate land and offshore water concerns
• Results in overdevelopment and pollution

38
Wetlands and Coastal Areas

• Coastlines
• National Marine Sanctuaries

• US has 12
• Managed for multiple uses, including
  conservation, recreation, education, etc.
• Commercial fishing permitted, though there are
  no take zones

39
Conservation of Land Resources

• Most endangered ecosystems in the US

http//video.pbs.org/video/1360919570/chapter/3/