Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 167.
  1. Library Resource
    Climate Change, Land and Resource Governance, and Violent Extremism: Spotlight on the African Sahel
    Rapports et recherches
    mai, 2019
    Algérie, Soudan, Sahara occidental, Érythrée, Éthiopie, Soudan du Sud, Cameroun, République centrafricaine, Tchad, Burkina Faso, Mali, Mauritanie, Niger, Nigéria, Sénégal

    Tetra Tech’s land tenure and property rights experts examine how weak land and resource governance can fuel drivers of violent extremism. With a focus on the African Sahel, this new issue brief finds this dynamic is especially prevalent when land and resource governance challenges are coupled with environmental disruptions, resource scarcity, or migration.

  2. Library Resource
    Rapports et recherches
    mai, 2021
    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

  3. Library Resource
    Rapports et recherches
    mai, 2021
    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

  4. Library Resource
    Rapports et recherches
    décembre, 2020
    Sahara occidental, Burkina Faso

    Dans le contexte sahélien, depuis la fin des années 2010 des discours normatifs sur la jeunesse et le pastoralisme se sont développés, trop souvent basés sur des catégories standards impropres à décrire les réalités locales et associées dans une chaine de causalité trompeuse: désœuvrement des jeunes, migrations, participation aux violences armées, conflits violents catégorisés de manière simpliste comme ethniques et socioprofessionnels, économie criminelle, dégradation des ressources, changement climatique.Il y a un paradoxe entre le développement de ces discours généraux et le manque de do

  5. Library Resource
    Articles et Livres
    décembre, 2016
    Tunisie

    Desert rangelands are characterised by low and highly variable rainfall regime, low forage production and high heterogeneity in the distribution of natural resources. This study was carried out in the desert rangelands of Tunisia to evaluate the response of different rangelands to annual rainfall in terms of aboveground net primary production (ANPP) and rain use efficiency over a 10‐year period (2003–2012). In general, ANPP values were relatively low (123 kg DM ha⁻¹ y⁻¹) but would tend to increase with increasing annual rainfall for all rangeland types.

  6. Library Resource
    Articles et Livres
    décembre, 2003
    Soudan

    Using the UNFCCC as a basis, and the objectives of estimating soil organic carbon (SOC) changes during the period 1900–2100, a spatially explicit database of climate, land cover and soil texture was compiled for a 262,000 km2 region in semi-arid Sudan. The area is characterized by low input cultivation of millet, sorghum and sesamé combined with livestock grazing. By integrating the database with the CENTURY ecosystem model, we were able to estimate historical, current and future pools of SOC as a function of land management and climate.

  7. Library Resource
    Articles et Livres
    décembre, 2012
    Jordanie, Afrique septentrionale

    The dry rangelands of West Asia and North Africa are fragile and severely degraded due to low rainfall and mismanagement of natural resources. Rainwater harvesting (RWH) interventions are used to increase soil moisture content, vegetation cover, and productivity. However, adoption of rainwater harvesting by communities is slow. To understand adoption constraints and to develop options for sustainable integration of rainwater harvesting, a benchmark watershed was established in the dry rangelands of Jordan.

  8. Library Resource
    Articles et Livres
    décembre, 2014
    Algérie, Libye, Égypte, Asie occidentale, Afrique septentrionale

    The Mediterranean region covers about 854 million ha, but only 118 million (or 14 per cent) are suitable for agricultural production. In North Africa and the Middle East (MENA), agricultural land covers about 5 per cent; in Egypt and Algeria, it occupies less than 4 per cent and, in Libya, less than 2 per cent of the total national land area. Across the Mediterranean region land use divides between natural pastures/rangelands (ca. 15 per cent), forests and woodlands (ca. 8 per cent), with the ca.

  9. Library Resource
    Articles et Livres
    décembre, 2011
    Europe, Afrique septentrionale

    Mediterranean areas of both southern Europe and North Africa are subject to dramatic changes that will affect the sustainability, quantity, quality, and management of water resources. Most climate models forecast an increase in temperature and a decrease in precipitation at the end of the 21st century. This will enhance stress on natural forests and shrubs, and will result in more water consumption, evapotranspiration, and probably interception, which will affect the surface water balance and the partitioning of precipitation between evapotranspiration, runoff, and groundwater flow.

  10. Library Resource
    Articles et Livres
    décembre, 2003
    Tunisie

    Apart from a decrease in total perennial plant cover, degradation of North-African arid lands is not easy to qualify. Yet, simple and comprehensive yardsticks are necessary to assess degradation. We assigned components of competitive ability (C), stress tolerance (S) and ruderality (R) to 15 common perennials of Presaharian Tunisia. We used for that purpose phyto-ecological studies, data about life-form, grazing value and demography and circumstantial data.

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