Desertification-2 - Desertification land degradation in...

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Desertification “land degradation in arid, semi-arid and dry sub-humid areas resulting from various factors, including climatic variations and human activities” (UNCCD)
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Why is it important? Drylands occupy 41% of Earth’s land area and are home to more than 2 billion people (90% in developing nations) Ecosystem services and biological productivity of drylands are necessary for sustaining the livelihoods: Crop production, livestock and dairy production, charcoal, construction material Availability of those is largely constrained by water availability and climate
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Fighting desertification in Morocco http://www.youtube.com/watch?v=kOMqFK4ysP4
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5 Initiation of Desertification Removal of vegetation is the primary factor initiating the process
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6 Onset of Desertification Semi-arid areas have sparse vegetation Desertification process of loss of the stability in natural vegetation If vegetation gets reduced More soil is exposed to: wind water Surface runoff increases because the ground becomes hard soil pore spaces are sealed off by compacted clay results in decreased soil water storage further decrease of vegetation
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Initiation of desertification Removal of vegetation can be caused by: Climatic changes (drought) Over-grazing by livestock (inappropriate numbers or types of animals) Deforestation Planting non-native plants
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This note was uploaded on 11/14/2011 for the course GEA 2284 taught by Professor Annaszyniszewska during the Fall '11 term at University of Florida.

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Desertification-2 - Desertification land degradation in...

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