Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 68.
  1. Library Resource
    Articles et Livres
    décembre, 2003
    États-Unis d'Amérique

    Fire was arguably the most important forest and rangeland disturbance process in the Inland Northwest United States for millennia. Prior to the Lewis and Clark expedition, fire regimes ranged from high severity with return intervals of one to five centuries, to low severity with fire-free periods lasting three decades or less. Indoamerican burning contributed to the fire ecology of grasslands and lower and mid-montane dry forests, especially where ponderosa pine was the dominant overstory species, but the extent of this contribution is difficult to quantify.

  2. Library Resource
    Articles et Livres
    décembre, 2003
    Australie

    Queensland, Australia, has a proud pastoral history; however, the private and social benefits of continued woodland clearing for pasture development are unlikely to be as pronounced as they had been in the past. The environmental benefits of tree retention in arid regions of the State are now better appreciated and market opportunities have arisen for the unique timbers of western Queensland.

  3. Library Resource
    Articles et Livres
    décembre, 2003
    Éthiopie

    Expert judgements are potentially a valuable source of information in land degradation assessment, especially in areas where data paucity impedes the use of quantitative models. However, expert opinions are also much disputed because they are not tested for consistency, abstain from formal documentation, while their quantitative interpretation is inherently unidentifiable. This paper evaluates and formalizes the use of expert judgements to conduct a nationwide water erosion hazard assessment in Ethiopia.

  4. Library Resource
    Articles et Livres
    décembre, 2003
    Niger

    Poor millet growth and yields in Niger are commonly attributed to rainfall deficits and low soil nutrient content. Land management by local farmers is done as a function of soil types, crops, and available resources. Farmer management practices in millet fields located on four different landscape positions were studied in a village in western Niger located near the 600 mm isohyet. Average distance from homestead to field was 980 m, with fields in the valley bottom much closer (average 225 m) and fields on the plateau much further (average 2300 m).

  5. 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.

  6. Library Resource
    Articles et Livres
    décembre, 2003
    Burkina Faso, Bénin, Nigéria, Suède, Allemagne, Italie, Tchad, Soudan, Niger, Cameroun, Afrique

    FAO’s goal is to alleviate poverty and hunger by promoting sustainable agricultural development, improved nutrition and food security, and ensuring that everyone has access at all times to the food they need for an active and healthy life. The importance of biological diversity for food security and sustainable agriculture has long been recognized by FAO; the Organization is working daily to promote its conservation and sustainable use in the contex of agriculture.

  7. Library Resource
    Articles et Livres
    décembre, 2003
    République arabe syrienne, Italie, Asie

    gricultural biodiversity in FAO FAO’s goal is to alleviate poverty and hunger by promoting sustainable agricultural development, improved nutrition and food security – the access of all people at all times to the food they need for an active and healthy life. The importance of biological diversity for food security and sustainable agriculture has been recognized by FAO and the Organization is working to promote its conservation and sustainable use in an agricultural context.

  8. Library Resource
    Cover photo
    Rapports et recherches
    décembre, 2003
    République-Unie de Tanzanie

    This study documents the plight of the Maasai pastoralists who have moved to Morogoro and Kilosa districts as a result of the recent socio-economic developments and environmental changes in Maasailand. The objective of this study was to analyse how the Maasai migrants have adapted themselves to the new ecological conditions and the impact of such adaptations on their livelihoods.

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