ظاهرة التصحر 00 اى تحويل الغابات لصحاري بواسطة القطع الجائر للاشجار
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Deforestation
Deforestation is usually defined as the loss of forest. FAO defines deforestation as converting forests to another land use or the long-term (more than 10 years) reduction of tree-canopy cover below the 10 percent threshold. Depending on how it is estimated, over 15 million ha of natural forest are lost in the tropics every year. This is more than the area of Nepal or Arkansas in the United States. To put this in proportion, total global forest cover is 3870 million ha, or 30 percent of the earth's land area; tropical and subtropical forests represent 56 percent of this total, or 2167 million ha.
The trees may be cut for their wood or pulp, to clear the land for agriculture or ranching, for housing, mining and other development. If an area of forest is cleared and houses are built on it, this land is obviously deforested and the forest is lost. If local people clear the trees and grow crops on the land for a few years and then move on, that cleared area is also deforested according to FAO, because it has come under agricultural use. However, if the same area is logged by clearfelling but the logging company intends to replant it with trees, this is not considered deforestation. This leads to the odd situation of having a forest without trees.
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Note added at 1 hr (2007-03-14 12:21:10 GMT)
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التصحر
If an area of forest is cleared and houses are built on it, this land is obviously deforested and the forest is lost
Reference: http://www.snvworld.org/cds/rgSFB/forest/1.1.4/index.htm
| Fathy Shehatto
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