Soil Erosion and Land Degradation PowerPoint

Soil Erosion and Land Degradation PowerPoint -...

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Land Degradation www.greenfacts.org www.nrcs.usda.gov
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Land Degradation Reduction in capacity of the soil to support life, through the damage to physical, chemical or biological properties, contributing to an unsustainable ecological system A biophysical process driven by socioeconomic and political causes
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Processes of land degradation Physical: decline in soil structure (compaction) Loss of fertile topsoil (erosion) Chemical: acidification, leaching, salinization, decrease in CEC, and fertility depletion Biological: reduction in soil organic matter and microbial biomass C, and decline in biodiversity
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Desertification Land degradation in arid, semi-arid and sub-humid areas resulting from complex interactions among physical, biological, political, social, cultural and economic factors (UNCCD) The process by which an area or region becomes more arid through loss of soil and vegetation cover Most at risk are existing dry lands (over 40% of the total land area of the world) mainly in Africa and Asia Affects more than 1 billion people envplan240.pbwiki.com
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Wikipedia.org
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Soil erosion by water and wind An estimated 24 billion tons of fertile soil disappear annually Over the past 20 years, the surface area lost is equal to all of the farmland of the United States of America
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Soil Erosion and Land Degradation PowerPoint -...

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