Résultats de la recherche | Land Portal
  1. Amérique septentrionale
  2. 1996
  3. Résultats de la recherche
Résultats de la recherche

Résultats de la recherche

Showing items 1 through 9 of 11.
  1. Library Resource

    Understanding global trends in the use of wheat diversity and international flows of wheat genetic resources

    Articles et Livres
    décembre, 1996
    Mexique, Canada, Guatemala, Afrique septentrionale, Asie méridionale

    This paper discusses the centers of origin and diversity for bread wheat; sketches historical patterns in the sources and use of wheat genetic resources in modern plant breeding; identifies and compares indicators of genetic diversity used by social and biological scientists; reviews the relationship of wheat genetic diversity to yield stability and vulnerability to disease; develops a profile of the structure of genetic variation in wheat in the developing world today; and investigates how scientific plant breeding has influenced the structure of genetic variation among the major bread whe

  4. Library Resource

    Temporal and Spatial Evaluation of Soil Conservation Policies

    Documents de politique et mémoires
    décembre, 1996
    États-Unis d'Amérique

    This paper presents estimates of the benefits and costs of alternative soil conservation policies in a spatially and temporally consistent framework. The policies considered are implementation of soil conservation practices with an objective of reducing erosion to a site's tolerance level and a policy with an objective of a voluntary 50% reduction in conventional tillage. Costs and erosion benefits of these two policies are compared with that obtained from CRP. The changes in erosion and cost are estimated relative to 1992 levels.

  5. Library Resource

    Geographical information systems - Applications to marine fisheries

    Articles et Livres
    décembre, 1996
    France, Philippines, Afrique du Sud, Espagne, Allemagne, Chine, Italie, Tonga, Pérou, Argentine, Royaume-Uni, Costa Rica, Géorgie, Canada

    The late 20th century has witnessed increasing crises in the world's marine fisheries. A causal analysis of these reveals that a common element are various manifestations of spatial inequity. This most frequently includes the inequity of access rights to the resource, but factors such as variations in resource depletion, spatio-temporal variations in stock recruitment, the imposition of regulatory zoning, destruction of marine ecosystems and the siting of mariculture facilities are other examples. To resolve some of these problems, management practices must be improved.

  6. Library Resource

    European Timber Trends and Prospects: Into the 21st Century

    Articles et Livres
    décembre, 1996
    France, Estonie, Lituanie, Suisse, Belgique, Espagne, Turquie, Croatie, Suède, Allemagne, Danemark, Ukraine, Bulgarie, Royaume-Uni, Grèce, Bélarus, Finlande, États-Unis d'Amérique, Japon, Hongrie, Italie, Portugal, Pologne, Pays-Bas, Irlande, République tchèque, Roumanie, Norvège, Autriche, Europe, Asie
    Régimes forestiers
    foresterie
    gestion des ressources naturelles

    This report reviews the outlook for the supply and demand of roundwood and forest products, and the balance between the two until 2020, while taking into account recycling, energy and trade issues. It covers the forest and forest products sector, including the forest itself, as well as production, trade and consumption of forest products and wood for energy

  8. Library Resource

    Forest-dependent people

    Articles et Livres
    décembre, 1996
    Mali, Suède, Canada, Italie
    Régimes forestiers
    politique foncière
    agriculteur
    gestion des ressources naturelles
    utilisation des terres
    foresterie
    indemnisation
    gestion foncière
    terrain forestier

    This issue of Unasylva considers some of the issues related to forest-dwelling and forest-dependent people, and particularly their role in and relationship to sustainable forest management.

  9. Library Resource

    Forestry extension

    Articles et Livres
    décembre, 1996
    Inde, Burkina Faso, Pakistan, États-Unis d'Amérique
    Régimes forestiers
    décentralisation
    Propriété publique
    agriculteur
    recherche
    foresterie
    terrain forestier
    femme

    This issue of Unasylva focuses on the challenges facing forestry extension and current attempts to respond to them.

Rechercher dans la bibliothèque foncière

Grâce à notre moteur de recherche robuste, vous pouvez rechercher n'importe quel document parmi les plus de 64 800 ressources hautement conservées dans la bibliothèque du foncier.

Si vous souhaitez avoir un aperçu de ce qui est possible, n'hésitez pas à consulter le guide de recherche.

 

Partagez cette page