lecture14_forestry_notes

lecture14_forestry_notes - Forests "Forests are the...

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Forests “Forests are the lungs of our land, purifying the air and giving fresh strength to our people." Franklin D. Roosevelt, 1937
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Outline 1. Forest and tree concepts 2. Status of world’s forests 3. Forests in the U.S. 4. Consumption in the U.S. 5. Summary
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Part 1: Forest and Tree Concepts
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What is a Forest • Area where trees are the dominant vegetation • Includes – Closed canopy forest – Areas with lower tree density ± Urban forest ± Oak savannah
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Roles of Forests • Oxygen • Clean water • Wildlife habitat • Aesthetics • Recreation • Protect soil • Food • Rare plants • Store carbon • Forest products
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Forest Products • Cellulose •S a p •B a r k
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Interesting Facts About Trees • Two mature trees can supply enough oxygen annually to support a family of four • A tree is 50% carbon • Trees are carbon sinks. Forests contain more carbon than the entire atmosphere! One tree can absorb as much carbon in a year as a car produces while driving 26,000 miles. • Each American uses the equivalent of one 100 foot tall, 16- inch diameter, tree every year for their paper and wood product needs http://www.savatree.com/tree-facts.html
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Part 2: Status of World’s Forests Food and Agricultural Organization of the United Nations. 2006. Global Forest Resource Assessment 2005. FAO, Rome. Forestry Paper 147. http://www.fao.org/forestry/site/fra/en/
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What is an Acre? A Hectare? • Unit of area • 43,560 square feet • 208.71 feet x 208.71 feet (does not need to be a square) • 1 square mile = 640 acres • 1 hectare = 2.54 acres
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World’s Forests • Total forest area in 2005 was 10 billion acres or 30% of land area (4.4 X land area of U.S.) Source: Global Forest Resource Assessment 2005
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Ten Countries with the Largest Forest Area • Russian Federation •B r a z i l • Canada • United States • China • Australia • Democratic Republic of the Congo • Indonesia •P e r u • India Source: Global Forest Resource Assessment 2005
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Major Changes in Forests • Deforestation • Expansion • Plantations
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Deforestation • Reduction in forest area caused by human activity – Agriculture – Transportation – Housing • Worldwide, 32 million acres/year deforested between 2000 – 2005 (annual amount = 3/5 size of Minnesota) • Most prevalent in tropical areas of the world (South America and Africa)
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lecture14_forestry_notes - Forests "Forests are the...

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