Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 611.
  1. Library Resource
    Articles et Livres
    décembre, 2013
    États-Unis d'Amérique

    A ca. 2010, 30m resolution map depicting annually tilled areas across the conterminous United States was developed. Input sources included fouryears, spanning 2008–2011, of annual national-level coverage Cropland Data Layer (CDL) land cover classifications as produced by the National Agricultural Statistics Service. Derived total land area under tillage from the aggregate CDL product equaled 112.8million hectares (278.7million acres).

  2. Library Resource
    Articles et Livres
    mai, 2011
    Europe, Amérique septentrionale

    „Kísértet járja be Európát és Észak-Amerikát: az erdőpusztulás kísértete.” Ezzel a drámai hangvételű mondattal kezdődik a World Resources 1986. évi kötetének erdőkkel foglalkozó része, ami a 70-es években kezdődött nagyarányú erdőpusztulás világméretű „jajkiáltása” volt, melynek visszhangja: „Mentsétek meg a Föld erdeit – amíg nem késő, amíg van mit megmenteni és megőrizni!” Nemzetközi tudományos, világméretű társadalmi fórumok témájává vált az erdő. Az emberiség egyre jobban ráébredt arra, hogy az erdő az emberiség létfeltételeinek elengedhetetlen része.

  3. Library Resource
    Documents de politique et mémoires
    décembre, 2008
    Canada

    Se realiza un recorrido por las principales prácticas forestales en Canadá y particularmente en la provincia de British Columbia. Se describen las principales formas de propiedad, gestión, aprovechamiento y conservación de los bosques. Finalmente, se repasan los objetivos de la Estrategia Forestal Canadiense, destacando aquellos que más difieren de los reflejados en la Estrategia Forestal Española.

  4. Library Resource
    Documents et rapports de conférence
    décembre, 2011
    États-Unis d'Amérique

    Current U.S. farm programs make payments to farmers based in part on historical base acres planted in particular program crops such as corn, soybeans, cotton, wheat and soybeans. Eligibility for payments includes regulations on the crops allowed to be grown on base acres, and there are restrictions on planting horticultural crops on such base acres. The fruits and planting restriction on base acres has potentially influenced the number of acres planted to fruits and vegetables over the past two decades.

  5. Library Resource
    Documents et rapports de conférence
    décembre, 2010
    États-Unis d'Amérique

    Herbicides account for approximately 2.2% of total farm expenses and are applied to more than80% of farmland in the USA. The widespread adoption of herbicides contributed to the increasedand relatively cheaper productivity of modern intensively managed agricultural systems indeveloped countries. The present study uses a hedonic framework to analyze the effect ofselected attributes on the price of corn and soybean herbicides. Two different empirical modelswere estimated separately for the two crops.

  6. Library Resource
    Articles et Livres
    décembre, 2015
    Australie, Brésil, Canada, États-Unis d'Amérique, Inde, Fédération de Russie, Chine

    Groundwater vulnerability assessment is an important task in water resources and land management. The most sophisticated among the vulnerability assessment techniques is the GIS-based DRASTIC model. However, despite its popularity, it is marred with excessive subjectivity glitches; little research has been conducted to address the shortcomings associated with this method. This study investigates various issues regarding the application of the GIS-based DRASTIC model through a critical review of relevant literatures.

  7. Library Resource
    Articles et Livres
    décembre, 2012
    Océanie, Amérique septentrionale

    The spatio-temporal distribution of land cover provides fundamental data for global climate and environmental change research. In recent decades, five global land cover maps have been produced based on remote sensing data sources and methodologies. Related research have shown that the availability and quality of the first four global land cover datasets are poor at the regional or the continental scale for a variety of reasons. There is still no consensus on the accuracy of the latest global land cover map.

  8. Library Resource
    Articles et Livres
    décembre, 2008
    États-Unis d'Amérique

    A new regionalism has been much documented and researched for metropolitan areas; this article documents that there is a new rural regionalism as well. In the United States, these groups appear most likely to emerge in areas that are challenged by outcomes characterizing globalization's effects on the rural condition: namely, exurban or metropolitan sprawl and the resulting landscape fragmentation, often in combination with extreme pressure on the profitability of small farms or other resource uses.

  9. Library Resource
    Articles et Livres
    décembre, 2012
    États-Unis d'Amérique

    There is a growing need to site new power generating plants that use cleaner energy sources due to increased regulations on air and water pollution and a sociopolitical desire to develop more clean energy sources. To assist utility and energy companies as well as policy-makers in evaluating potential areas for siting new plants in the contiguous United States, an adaptation of a geographic information system (GIS)-based multicriteria decision analysis approach is presented in this paper.

  10. Library Resource
    Articles et Livres
    décembre, 2009
    États-Unis d'Amérique

    United States policy makers are promoting bio-fuels as an economic development opportunity, especially for rural America. A USDA study claims that developments in energy production from biomass could increase profits for agricultural commodity producers. However, as William Heffernan and his colleagues have demonstrated, concentration in the agrifood sector limits the economic benefits going to the commodity producers.

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