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Land degradation is an increasing problem in many parts of the world. Success in fighting land degradation requires an improved understanding of its causes, degree, impact and acquaintance with climate, water, soil, land cover and socio- economic factors. Therefore, land degradation assessment is a primary goal in a decision support system for reversing degradation.As one of the most common and serious environmental problems in the world, land degradation has affected two billion hectares (22.5%) of the world´s agricultural land, pasture, forest and woodland. It is estimated that global land degradation in drylands causes a loss of land productivity valued around US$13-28 billion a year. In addition to economic loss associated with reduced land productivity, land degradation also adversely affects the environment.

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LECTURER OF ENVIRONMENTAL SCIENCES, Environmental Sciences Dept., Faculty of Science at Damietta University, Egypt.Ph. D. of Sciences-Environmental Sciences (Environmental Quality Monitoring) . Faculty of science, Damietta University, Egypt.

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