Lecture 11 Issues of Soil.ppt

Lecture 11 Issues of Soil.ppt - Lecture-11 Issues of Soil...

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Lecture-11: Issues of Soil Course Instructor: Md Asif Rahman (ASR) Lecturer, Department of Mathematics and Natural Sciences (MNS) University Building 2 (15 th Floor) E-mail: [email protected]
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DESERTIFICATION মরুকরণ Desertification is a process by which land is turned into desert as a result of human activity as well as natural processes such as climatic change. Soil erosion and salinization (Salinization refers to a build up of salts in soil) are two process that may result in desertification, because both can create land surfaces unable to support vegetation.
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CAUSES OF DESERTIFICATION Natural processes Decline in rainfall (causes drought) Human activities Overgrazing Over cultivation Deforestation Population pressure Demand for food Demand for fuel wood All these causes decline in vegetation cover, because soil erosion is increased by wind and rain.
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SYMPTOMS OF DESERTIFICATION AND THEIR EFFECTS Symptoms of Symptoms of desertification desertification Effects Effects Reduced crop yields ( ফসল উৎপপদন ) Less food, more hunger & malnutrition Reduced total biomass Less available feed for livestock Reduced wood biomass Less wood for fuel and longer searches for fuel supplies Reduced water availability Searches for surface & underground water Increased disruption to life People need aid & relief, migration, becoming refugees
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Methods for tackling the causes of desertification
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