land use our urban world forestry management parks, reserves, and wildlands agricultural land use
TRANSCRIPT
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Land Use
Our urban worldForestry management
Parks, Reserves, and WildlandsAgricultural land use
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Urban environments Created due to industrialization
Require resources from other places
Need natural land nearby for
ecosystem services: water, air, waste escape from stresses of daily urban life preservation for posterity
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Urban environments Includes larger and larger percentages of
the population
1850 – included 15% of US citizens1920 – included more than 50% of US citizensNow – includes more than 80% of US citizens
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Chicago area population growth
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Portland area population growth
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Urban Sprawl Why does this happen?
What are the positive and negative aspects of sprawl?
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What makes a city livable?
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Examples of livable cities Chicago area
Portland area
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Forest management Forests provide many resources and
services In US, management practices have
changed over time
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Westward expansion Development of resources – forests,
minerals, rangelands
Originally there was no land use planning
Deforestation began to occur
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Natural forests, 1620
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Natural forests, 1920
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Natural forests today
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Management strategies Clear cutting vs. selective cutting
Maximum sustainable yield
Ecosystem based management
Adaptive management
Public vs. private land
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US Forest Service Gifford Pinchot
Changing mission Timber for nation Multiple use management
Impact of road building
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US Forest Service and fires Changing opinions
on management
Total suppression Let it burn Prescribed burns Influence of climate
change
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US federal parks and reserves National parks:
Managed by National Park Service monuments, historic sites, wild and scenic
rivers, parks, and recreation areas Too many visitors?
National forests: Managed by US Forest Service Timber harvests Fire suppression
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US federal parks and reserves National wildlife refuges:
Managed by US Fish and Wildlife Service Variety of management styles
Preservation (Sevilleta NWR as example) Active manipulation
(Bosque del Apache NWR as example)
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Sevilleta Wildlife Refuge, NM
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Sevilleta Wildlife Refuge, NM
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Bosque del Apache Wildlife Refuge, NM
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Bosque del Apache Wildlife Refuge, NM
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Wilderness areas Should they exist?
Changing values Resources such as timber, oil, minerals? States rights?
Wilderness Act of 1964 Public lands can be set aside No development allowed
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What should parks look like? Many small or one large? Protection of biodiversity Wildlife corridors
What is practical?
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Agricultural land use 38% of land world-wide is agriculturally
used 2/3 of this is pasture land 1/3 of this is used for crops
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Crop production - feeding the world Industrial agriculture – green revolution
Inorganic fertilizers and synthetic pesticides Fossil fuels Genetically modified crops Monocultures Removal of wetlands
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What about sustainable agricultural practices? Soil management Irrigation practices Targeted fertilizer Integrated pest management No-till farming
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Livestock grazing ¼ of world land
Sustainable if at low intensity – think about Tragedy of the Commons
Use of public lands
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Some additional agricultural issues Feedlot agriculture (factory farming) Aquaculture Organic farming Buy local movement
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Making cities livable Planning and zoning Urban growth boundaries Smart growth New urbanism Transit options Parks