LYCOS RETRIEVER 
Deforestation: Regions
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Zheng and Eltahir (1997) studied the response of the monsoon system to deforestation and desertification using a simple model. The results suggest that the potential impact of human induced change of land cover on regional climate depends critically on the location of the change in vegetation cover. That is, desertification along the border withthe Sahara (e.g., in Chad, Niger, Mali and Mauritania) leaves a relatively minor impact on monsoon circulation and regional rainfall; deforestation along the southern coast of West Africa (e.g., in Nigeria, Ghana and Ivory Coast) may result in complete collapse of monsoon circulation, and a significant reduction of regional rainfall.
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No single factor alone will halt the deforestation currently occurring in the region. However, a combination of reforms and policy changes -- including the alteration of present land tenure practices -- will reduce the excessive rate of forest clearing. It remains for the governments of Latin America to act on policy recommendations to face the complex challenge before them.
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The upper reaches of other rivers in Sichuan, such as the Gold Sands River, the Yalong River, the Dadu River, the Fu River, the Tuo River, and the Jialin River, experienced similar deforestation and desiccation. The deforestation that has occurred along these rivers in Sichuan province has reduced the amount of moisture available for the adjacent arid regions of Qinghai and Gansu province.
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In a global context annual deforestation rates are relatively low in Central Africa (~0.6%/year between 1980-90) but vary considerably across the region. The location and rates of deforestation in Central Africa are poorly documented, limiting the development of regional and national forest management plans and policies.
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The scientists note... that the rainfall changes would primarily occur in certain seasons and that the combination of deforestation in these areas enhances rain in one region while reducing it in another. The total amount of rain that falls on Earth would not change, the computer modeling suggests.
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