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Showing items 1 through 9 of 133.
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Library Resource
Publication évaluée par des pairs
The dramatic growth of the world’s population is increasing the pressure on natural resources, particularly on soil systems. At the same time, inappropriate agricultural practices are causing widespread soil degradation. Improved management of soil resources and identification of the potential agricultural capability of soils is therefore needed to prevent further land degradation, particularly in dryland areas such as Egypt. Here, we present a case study in the El-Fayoum depression (Northern Egypt) to model and map soil suitability for 12 typical Mediterranean crops.
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Library Resource
Publication évaluée par des pairs
Conversion of native lands into agricultural use, coupled with poor land management practices, generally leads to changes in soil properties. Understanding the undesirable effects of land-use and land-cover (LULC) changes on soil properties is essential when planning for sustainable land management.
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Library Resource
Publication évaluée par des pairs
Soil erosion is an important environmental problem that can have various negative consequences, such as land degradation, which affects sustainable development and agricultural production, especially in developing countries like Tunisia. Moreover, soil erosion is a major problem around the world because of its effects on soil fertility by nutriment loss and siltation in water bodies. Apart from this, soil erosion by water is the most serious type of land loss in several regions both locally and globally.
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Library Resource
Publication évaluée par des pairs
Soil erosion is an important environmental problem that can have various negative consequences, such as land degradation, which affects sustainable development and agricultural production, especially in developing countries like Tunisia. Moreover, soil erosion is a major problem around the world because of its effects on soil fertility by nutriment loss and siltation in water bodies. Apart from this, soil erosion by water is the most serious type of land loss in several regions both locally and globally.
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Library Resource
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Library Resource
Soudan, Afrique orientale
On a global scale, Sudan perhaps ranks first in terms of pastoralists population size. About
66 per cent of Sudan is arid land, which is mainly pastoralists’ habitat. Pastoralism in the
Sudan involves about 20 per cent of the population and accounts for almost 40 per cent of
livestock wealth [Markakis, 1998: 41]. The livestock sector plays an important role in the
economy of the Sudan, accounting for about 20 percent of the GDP, meeting the domestic
demand for meat and about 70 percent of national milk requirements and contributing about
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Library Resource
Soudan, Afrique orientale
On a global scale, Sudan perhaps ranks first in terms of pastoralists population size. About
66 per cent of Sudan is arid land, which is mainly pastoralists’ habitat. Pastoralism in the
Sudan involves about 20 per cent of the population and accounts for almost 40 per cent of
livestock wealth [Markakis, 1998: 41]. The livestock sector plays an important role in the
economy of the Sudan, accounting for about 20 percent of the GDP, meeting the domestic
demand for meat and about 70 percent of national milk requirements and contributing about
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Library Resource
Publication évaluée par des pairs
Natural rangelands occupy about 5.5 million hectares of Tunisia’s landmass, and 38% of this area is in Tataouine governorate. Although efforts towards natural restoration are increasing rapidly as a result of restoration projects, the area of degraded rangelands has continued to expand and the severity of desertification has continued to intensify. Any damage caused by disturbances, such as grazing and recurrent drought, may be masked by a return of favorable rainfall conditions.
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Library Resource
Algérie, Soudan, Érythrée, Éthiopie, Soudan du Sud, Cameroun, République centrafricaine, Tchad, Burkina Faso, Mali, Mauritanie, Niger, Nigéria, Sénégal
Drylands occupy more than 40% of the world’s land area and are home to some two billion people. This includes a disproportionate number of the world’s poorest people, who live in degraded and severely degraded landscapes. The United Nations Convention to Combat Desertification states on its website that 12 million hectares are lost annually to desertification and drought, and that more than 1.5 billion people are directly dependent on land that is being degraded, leading to US$42 billion in lost earnings each year.
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Library Resource
States of ecological maturity and temporal trends of drylands in Morocco, Algeria and Tunisia north of 28 N are reported for 1998–2008. The input data were Normalized Difference Vegetation Index databases and corresponding climate fields, at a spatial resolution of 1 km and a temporal resolution of one month. States convey opposing dynamics of human exploitation and ecological succession. They were identified synchronically for the full period by comparing each location to all other locations in the study area under equivalent aridity.
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