Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 43.
  1. Library Resource
    Rapports et recherches
    janvier, 2004
    Afrique australe, Asie, Europe, Amérique septentrionale

    "Agricultural research has greatly increased the yields of important staple food crops, and for many people this has meant more food availability and trade opportunities. Yet many people in rural areas in developing countries still live in abject poverty. Therefore, policymakers, donors, and researchers are refocusing their priorities away from simply producing more food to making sure that agricultural research benefits the poor in particular. How can we ensure that new agricultural technologies are appropriate for the different groups of people who most need assistance?

  2. Library Resource
    Articles et Livres
    décembre, 2003
    États-Unis d'Amérique

    The Rocky Mountains of the western United States contain many economically important natural resources. Increasing development of these resources has lead to land degradation, which often requires restoration efforts. A common type of disturbance in this region is mineral extraction and these activities often occur in zones of vegetation dominated by shrubs. These mined lands have proven to be particularly challenging to restore to native shrub cover.

  3. 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.

  4. Library Resource
    Articles et Livres
    mai, 2003
    États-Unis d'Amérique

    As many local and state governments in the United States grapple with increasing growth pressures, the need to understand the economic and institutional factors underlying these pressures has taken on added urgency. From an economic perspective, individual land use decisions play a central role in the manifestation of growth pressures, as changes in land use pattern are the cumulative result of numerous individual decisions regarding the use of lands.

  5. Library Resource
    Articles et Livres
    décembre, 2003
    États-Unis d'Amérique

    Growing processing tomatoes represents one of the most intensive forms of land use in terms of water consumption and nutrient inputs. During the last decade in many European countries and in the United States, Integrated Crop Management guidelines have also been applied for fertilisation and reducing nitrogen inputs to crops has become compulsory. A large number of Best Management Practices, rules and tools have been developed to steer farmers toward sustainable farming practices.

  6. Library Resource
    Documents de politique et mémoires
    décembre, 2003
    États-Unis d'Amérique

    Changes in the use of land in the United States produce significant economic and environmental effects with important implications for a wide variety of policy issues, including protection of wildlife habitat, management of urban growth, and mitigation of global climate change. In contrast to previous descriptive and qualitative analyses of the trends in national land use, this paper uses an econometric approach to isolate the importance of historical changes in land-use profits and key government policies in determining national land-use changes from 1982 to 1997.

  7. Library Resource
    Articles et Livres
    décembre, 2003
    États-Unis d'Amérique

    Conservation of native fishes and changing patterns in wildfire and fuels are defining challenges for managers of forested landscapes in the western United States. Many species and populations of native fishes have declined in recorded history and some now occur as isolated remnants of what once were larger more complex systems. Land management activities have been viewed as one cause of this problem. Fires also can have substantial effects on streams and riparian systems and may threaten the persistence of some populations of fish, particularly those that are small and isolated.

  8. Library Resource
    Articles et Livres
    décembre, 2003
    États-Unis d'Amérique

    Early-successional habitats (e.g. grasslands, shrublands, and early-successional forests) and their associated wildlife are declining throughout the northeastern United States. State wildlife agencies are generally charged with conserving all native wildlife and their habitats within their respective state. However, some have suggested that state wildlife agencies in the region are not addressing the decline of early-successional wildlife and habitats sufficiently.

  9. Library Resource

    En: Mercados de tierras agrícolas en América Latina y el Caribe: una realidad incompleta - LC/G.2202-P - 2003 - p. 85-125

    Articles et Livres
    Rapports et recherches
    juillet, 2003
    Chili, Mexique, États-Unis d'Amérique

    Proyecto Opciones de Políticas para el Fomento del Desarrollo de Mercados de Tierras Agrícolas, con el Fin de Facilitar la Transferencia de Tierras a Pequeños Agricultores

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