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Soil Background Template
Transcript of Soil Background Template
- over & under grazing In severe cases, wind can carry away topsoil and can create a dust storm 1) Loss of soil fertility by depletion of plant nutrients in topsoil This process can cause environmental damages Eroded soil becomes sediment in nearby surface waters, causing cloudy water / higher turbidity 70% of the world's dry lands used for agriculture are threatened by desertification Humans have accelerated natural soil erosion We can try to prevent soil erosion by: Encourage safer farming Entire civilizations have collapsed because they mismanaged the topsoil that supported their populations Dust storms have increased 10-fold since 1950 90% of American farmland is losing topsoil 17x faster than it can be replenished How did this happen? Who's to blame, nature or us? 3 to 5million acres of US farmland are lost each year through the mismanagement of soil Since 1950, more than 1/3 of the world's
farmable land has been lost to soil erosion Soil Erosion results from: Desertification Water Erosion The amount of sediment transported by rivers to the ocean is about 24 metric tons per year Tree roots hold down topsoil and prevent erosion pH indicates the level of nutrients in the soil Keeping soil saturated can prevent erosion by wind meaning that the land is becoming less suitable for cultivation more desert-like 2) 3) Plant Check it Water it Contour Farming Windbreak / Alley Cropping Crop Rotation Use Organic Fertilizers No-Till Farming Grow Indigenous Crops Bibliography Tarbuck, Edward J., and Frederick K. Lutgens. "Chapter 6: Weathering and
Soil." Earth: An Introduction to Physical Geology. 10th ed. New Jersey:
Pearson Prentice Hall, 2011. 186-95. Print. Miller, G. Tyler, and Scott Spoolman. Living in the environment: concepts,
connections, and solutions. 16th ed. Pacific Grove, CA: Brooks/Cole,
2009. Print. Favis-Mortlock, David. "Soil Erosion Site." Soil Erosion Site. N.p., May 2007.
Web. 23 May 2013. <http://www.soilerosion.net/>. Collins, Jocelyn. "Soil Erosion." Soil Erosion. N.p., 01 Feb. 2001. Web. 24 May
2013. <http://www.botany.uwc.ac.za/envfacts/facts/erosion.htm>. Oak, Manali. "10 Ways to Conserve Soil." Buzzle. N.p., n.d. Web. 23 May
<http://www.buzzle.com/articles/10-ways-to-conserve-soil.html>. Water erosion comes in around 11 million square km This means the area affected by wind erosion is around 5.5 million square km Accelerated soil erosion by water is responsible for about 55% Around 15% of Earth's ice-free land surface is afflicted by all forms of land degradation Wind erosion is responsible for about 30% The area affected by tillage and farming erosion is unknown The majority of the world's 862 million malnourished people are trying to survive on land with severely eroded soil 3) The End United States. USDA. Natural Resources Conservation Service. Soil Quality
Resource Concerns: Soil Erosion. N.p., Apr. 1996. Web. 25 May 2013.