Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 39.
  1. Library Resource
    Articles et Livres
    décembre, 2005
    États-Unis d'Amérique, Chine, Australie, Canada, Éthiopie, Pakistan, Uruguay, Kenya, Jordanie, Afrique du Sud, Turquie, Madagascar, Italie, République-Unie de Tanzanie, Pays-Bas, Argentine, Inde, Mexique, Brésil, Mongolie

    This book brings together information on the contrasting characteristics, condition, present use and problems of the world's main natural grasslands. Since grassland is commercialized through the grazing animal, particular attention is paid to the livestock production systems associated with each main type. Grazing resources are more than simply edible herbage: many other factors have to be taken into account, notably water in all areas, and shelter in winter-cold climates.

  2. Library Resource
    Articles et Livres
    décembre, 2005

    This paper examines the relationships between cultivation, livestock grazing and land degradation in Adamawa State. The main objective was to identify areas with major symptoms of degradation, such as rills and gullies, and determine the main causal factor(s), whether cultivation or grazing. Thus, areas of varying intensity of cultivation and livestock grazing were delineated and detailed field investigations for evidence of degradation carried out.

  3. Library Resource
    Documents et rapports de conférence
    décembre, 2005
    Espagne

    The natural regeneration in the dehesa has been object of numerous studies, due to the ecologic and economic importance of such ecosystems. In this work is exposed a test of acorns germination of Quercus ilex L. subsp. ballota (Desf.) Samp, in the North of Córdoba (Spain), under three environmental conditions corresponding to the most traditional land uses of the dehesa: grazing, cereal sowing and fallow, each one with a different vegetal cover. A fourth group of acorns was placed in a tree nursery under controlled conditions.

  4. Library Resource
    Articles et Livres
    décembre, 2005
    Grèce

    Traditionally, management of rangelands is based on the successional theory for vegetation developed by Clements. This approach, which came to be known as “the range succession model”, assumes a progressive change of vegetation towards the final (climax) stage and considers grazing as a primary driver of its dynamics. This model cannot be applied in Mediterranean rangelands, however, because they are largely modified plant communities and their final stage is usually a forest or dense woodland.

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