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Part 3
Land and Water Use
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RANGELANDS
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• Uncultivated land dominated by native plants: grasses, grass-like plants, or shrubs.
• All land that is not farmland, dense forest, barren desert or land covered by solid rock, concrete, or glaciers
What is Rangeland?
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How much rangeland is there?
47% of the EARTH is rangeland
36% of the US is rangeland
53% of Western States is rangeland
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• Overgrazing
• Desertification
Issues Facing Rangelands
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• When grazed severely, use energy stored in roots for regrowth
• Roots die back– Severity depends on grazing
• Grazed again before roots recover
How Overgrazing Kills Plants
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• Adds organic matter• Increased soil porosity• Increased infiltration• Increased moisture holding capacity
Positive Effect of Root Dieback
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Consequences of Overgrazing
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• Overgrazing• Soil erosion• Prolonged drought or climate change• Overuse of available resources
Causes of Desertification
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• “Public Land” is owned and managed by federal and state governments – Bureau of Land Management (BLM)– U.S. Forest Service
Who owns rangeland?
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• The careful use and management of rangeland resources (plants, animals, soil, and water) to meet the needs and desires of society
What is rangeland management?
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• Controlling the number and distribution of livestock
• Restoring degraded rangeland• Moving livestock to allow recovery• Reduce damage to sensitive areas
(riparian zones)– Boundary zone between land and stream
Rangeland Management Goals
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• Suppress growth of invasive species• Reduce soil erosion
– Replant native grasses• Provide supplemental feed• Locating water holes, water tanks,
salt blocks in areas where will not affect environment.
Rangeland Management Goals
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MINING
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OverviewSteps Description Environmental
Effects
Mining Removing mineral resources from the ground
• Mine wastes – acids and toxins
• Displacement of native species
• Reclamation of land and recycling
Processing Removing ore from mined material
• Pollution• Human health
concerns
Use Distribution to end user
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Will Site be Profitable?
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• Site development
Extraction
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• Surface Mining– Pros:
– Cons
Extraction
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• Underground Mining– Pros
– Cons
Extraction
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• In-situ Leaching– Pros
– Cons
Extraction
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• Intensive chemical processing
• Often uses extreme heat and toxic chemicals
• Chemical frequently leak into ground water
Processing
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• 2 billion tons of minerals extracted in US every year
• Oil
• Coal
• Natural Gas
Global Reserves
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• General Mining Law 1872– Free access to prospect for minerals on federal
lands• Surface Mining Control and Reclamation
Act 1977– Regulates surface coal mining and reclamation
activities
Relevant Laws