Soil Erosion - Human Security

Soil Erosion - Human Security - Impending Catastrophe of...

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Impending Catastrophe of Soil Erosion By Sijia Hao
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Soil, the Substance Soil is composed of weathered rock, water, oxygen, organic materials Natural processes create soil… slowly. Rate of replenishment 1/2 inch/century Provides essential nutrients to all plant life Without soil – life cannot exist . “Soil is the Skin of the Earth.” - David Montgomery
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Erosion in the Equation erosion sweeps away exhausted soil so that fresh soil can replace it Balance is Key: between rate of erosion and rate at which weathering forms new soil
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Man in the Mix: A History of Agriculture ~12,000 BCE : Early records of agriculture and animal husbandry in Egypt 9,000-7,500 BCE: flourishing range of crops in the Fertile Crescent of Mesopotamia 9,000-8,000 BCE: domestication of rice in China 6,500-5,500 BCE : maize appears in Mesoamerica 4500 BCE : Bronze Age begins in the Middle East; tools made of iron and copper 2,000 BCE : Widespread use of oxen pulling a plow and a four-wheeled farm cart
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Hazards on the Horizon Deforestation  erosion through uprooted trees Plowing  erosion through loosening of topsoil Overgrazing  erosion through animals ripping out
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This note was uploaded on 01/25/2012 for the course ENVIRON 290 taught by Professor Princen during the Fall '10 term at University of Michigan.

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Soil Erosion - Human Security - Impending Catastrophe of...

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