Earth_122_Ch17_notes[1]

Earth_122_Ch17_notes[1] - 3/18/2009 Introduction to...

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3/18/2009 1 Introduction to Environmental Science Introduction to Environmental Science: 17. Land Use: Forests and Grasslands Earth 122 Prof. Walter A. Illman Land Use: Forests and Grasslands Forests precede people; desert succeed them. François-René de Chateubriand
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3/18/2009 2 Objectives Discuss the major world land uses and how human activities impact these areas. Summarize some forest types and the products we derive from them. Report on how and why tropical forests are being disrupted as well as how they might be better used. Understand the major issues concerning forest in more highly developed countries such as Canada and the United States. Objectives Understand forestry management and forestry practices. Outline the extent, location, and state of grazing lands around the world. Describe how overgrazing causes desertification of rangelands. Explain why land reform and recognition of indigenous rights are essential for social justice as well as environmental protection.
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3/18/2009 3 Outline World Land Uses World Forests Forest Products Tropical Forests Swidden Agriculture Temperate Forests Harvest Methods Fire Management Rangelands Land Ownership and Land Reform WORLD LAND USES Earth’s total land area is about 133 million km 2 (29% of the globe). Approximately 11% of the earth’s landmass is now used for crop production, and half of present forests and grazing lands could be converted. Immediate and destructive impacts on landscape and wildlife wildlife. Resilient if given enough time.
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3/18/2009 4 World Land Use WORLD FORESTS Forests play vital ecological roles: Regulating climate, controlling water runoff, providing food and shelter for wildlife, and purifying air. Provide valuable materials. Wood, paper pulp. Scenic, cultural, and historic value.
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3/18/2009 5 Forest Distribution One third of original forests and woodlands have been converted to other uses. Currently, forests and woodlands cover 32% of earth’s land surface. (4.2 billion ha) Greatest concern is over protection of Old Growth Forests . » 39% of forests still retain old growth characteristics. Major Vegetation Zones
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3/18/2009 6 Forest Products Wood plays a part in more activities of the modern economy than any other commodity. Industrial timber and unprocessed logs account for about half of worldwide wood consumption. Developed countries produce less than half of all industrial wood, but account for about 80% of consumption consumption.
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This note was uploaded on 10/31/2011 for the course EARTH 122 taught by Professor Calia during the Spring '08 term at Waterloo.

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Earth_122_Ch17_notes[1] - 3/18/2009 Introduction to...

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