The Measurements of Desertification

Measurement of desertification "Dry and desertification is threatening the livelihood of more than 1 billion people in more than 110 countries," Coffe warned in 2001 (Kovach, 2003). Although the definition of desertification is highly controversial, it is usually the transition to a desert state in a dry or semi-arid region that supports low vegetation, low soil fertility, and high evaporation rate (Haggett, 2001 ). This work ignores the way the desert is measured in various different ways.

Florida Nicholson, Florida state university professor of climate, said, "If we can agree with this definition we can quantify desertification." . However, even if a scientist can not agree with this definition, the indicator can provide a consistent symptom scale, just as a doctor treating a patient with an unidentified disorder tracks symptoms such as fever I can do it. Another thing necessary for the prince and others to advance desertification in the Sahel is time. If the land is not considered desertified, it is necessary to track long-term changes of at least 10 to 20 years to ascertain whether vegetation changes permanently unless the change is permanent there is. In 2006, Goddard 's Global Inventory Modeling and Mapping Research (GIMMS) team headed by Tucker published satellite - based vegetation records over the past 24 years.

Despite its exciting name, desertification is not a sand dunes march in residential areas. Instead, it is a permanent deterioration of fertile land before. The causes of desertification by humans include overgrazing, accumulation of salt in irrigated soils, erosion of topsoil, and so on. Long-term climate change, especially rainfall, is the cause of natural desertification. Long-term drought may mimic desertification, but vegetation may recover if seasonal rainfall recovers. To help identify areas where desertification is occurring, scientists compare long-term satellite measurements of vegetation with rainfall data

Agriculture plays an important role in desertification Animal overgrazing, especially soil destruction, is the main cause of desertification. Overgrazing can be attributed to grazing activities that manage and control excess animals or animals (Rayburn, 2000) Overgrazing reduces plant leaf area, decreases sunlight and reduces plant growth I will. The plant weakens, the root length shortens, the turf weakens. Excessive grazing increases soil erosion. Darkoh (2006) emphasizes that overgrazing in North Africa brings desertification and brings moderate to severe desertification in dry meadows. Libya, semi arid region of Libya, Algeria and Tunisia in Morocco "