Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 9.
  1. Library Resource
    Rapports et recherches
    mai, 2023
    Sahara occidental, Afrique occidentale, Sénégal

    Les perturbations climatiques, l’évolution démographique et les sécheresses des dernières décennies, ont contribué à une rupture d’équilibre entre les systèmes de production pastorale et agricole, au détriment des pasteurs. À côté de ce contexte écosystémique, d’autres facteurs viennent aggraver la situation pastorale dans le Sahel, en particulier le rétrécissement de l’espace pastoral, grignoté par l’expansion des terres agricoles.

  2. Library Resource
    Articles et Livres
    décembre, 2020
    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.

  3. Library Resource
    Articles et Livres
    décembre, 2016
    Algérie, Maroc, Tunisie

    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.

  4. Library Resource

    Volume 9 Issue 5

    Publication évaluée par des pairs
    mai, 2020
    Algérie, Soudan, Érythrée, Éthiopie, Soudan du Sud, Cameroun, République centrafricaine, Tchad, Burkina Faso, Mali, Mauritanie, Niger, Nigéria, Sénégal

    Desertification is defined as land degradation occurring in the global drylands. It is one of the global problems targeted under the Sustainable Development Goals (SDG 15). The aim of this article is to review the history of desertification and to evaluate the scientific evidence for desertification spread and severity. First quantitative estimates of the global extent and severity of desertification were dramatic and resulted in the establishment of the UN Convention to Combat Desertification (UNCCD) in 1994. UNCCD’s task is to mitigate the negative impacts of desertification in drylands.

  5. Library Resource
    Matériels institutionnels et promotionnels
    mars, 2014
    Afrique septentrionale, Maroc, Tunisie, Asie méridionale, Iran, Asie occidentale, Jordanie, Yémen

    This document is a synthesis of outcomes from a knowledge process that was a collaborative effort involving researchers, scientists, and technicians from Iran, Jordan, Morocco, Tunisia, and Yemen.

  6. Library Resource
    Rapports et recherches
    juin, 2015
    Afrique septentrionale, Tunisie

    List of Participant to the stakeholder meeting held in Tunis and aimed at establishing a processes for sustainable collective rangeland management and governance

  7. Library Resource
    Matériels institutionnels et promotionnels
    juin, 2015
    Afrique septentrionale, Tunisie

    Presentation made by Jutta werner during the stakeholder meeting held in Tunis and aimed at developing sound policies that will enable implementation of governance of rangelands (collective action for sustainable pastoralism)

  8. Library Resource
    Documents de politique et mémoires
    septembre, 2018
    Afrique septentrionale, Tunisie

    Stipagrostis pungens is a perennial grass species which belongs to the Poaceae family. It is usually found with several erect culms, grows up to 1.5 m in height, and forms substantial tufts. It is a tall stiff glabrous grass with pungent leaves, and a C4 grass with sclerophyllous, spine-tipped, inrolled leaves, with sunken stomata. The root system extends laterally for a radius of 20 m or more. The roots are covered throughout their length by a sandy sheath, which is penetrated by the root hairs that occur throughout the entire length of the sheath.

  9. Library Resource
    Rapports et recherches
    août, 2012
    Afrique septentrionale, Algérie, Libye, Maroc, Afrique orientale, Érythrée, Éthiopie, Asie central, Kazakhstan, Tadjikistan, Turkménistan, Ouzbékistan, Asie méridionale, Iran, Asie occidentale, Bahreïn, Iraq, Jordanie, Koweït, Oman, Qatar, Arabie saoudite, République arabe syrienne, Émirats arabes unis

    This issue of Caravan describes the new program, and some of the research innovations it will build on. The issue begins with two ‘opinion pieces’ by scientists from partner organizations in the CRP. They share lessons learnt from past successes (and failures), and ideas that could be applied to dryland

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