Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 92.
  1. Library Resource
    Publication évaluée par des pairs
    juin, 2015
    États-Unis d'Amérique

    This paper describes various possibilities of the cities of futures considering various constraints and demand of society, environment and geography. The need for future cities arises because of the rapid growth in population and thereby causing a decline in the living standards. In the United States itself, many people are moving to cities every day. Today cities are getting crowded and if the influx continues at the same rate, current cities will become unmanageable and unlivable.

  2. Library Resource
    Articles et Livres
    décembre, 2013
    États-Unis d'Amérique

    Ecosystem services, i.e., services provided to humans from ecological systems have become a key issue of this century in resource management, conservation planning, and environmental decision analysis. Mapping and quantifying ecosystem services have become strategic national interests for integrating ecology with economics to help understand the effects of human policies and actions and their subsequent impacts on both ecosystem function and human well-being.

  3. Library Resource
    Articles et Livres
    décembre, 2011
    États-Unis d'Amérique, Amérique septentrionale

    Fire, climatic variability, and grazing by large herbivores have historically limited woody vegetation in the tallgrass prairie region of North America to gallery forests in protected areas along rivers and streams. Fire, in particular, has been a strong selective pressure against woody vegetation. Consequently, we expect that dominant tree species in these forests have developed mechanisms for tolerating periodic surface fires.

  4. Library Resource
    Articles et Livres
    décembre, 2013
    États-Unis d'Amérique

    This study provides a spatially comprehensive assessment of sustainable agricultural residue removal potential across the United States for bioenergy production. Earlier assessments determining the quantity of agricultural residue that could be sustainably removed for bioenergy production at the regional and national scale faced a number of computational limitations. These limitations included the number of environmental factors, the number of land management scenarios, and the spatial fidelity and spatial extent of the assessment.

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

    Land use and land cover changes have complex linkages to climate variability and change, biophysical resources, and socioeconomic driving forces. To assess these land change dynamics and their causes in the Great Plains, we compare and contrast contemporary changes across 16 ecoregions using Landsat satellite data and statistical analysis. Large-area change analysis of agricultural regions is often hampered by change detection error and the tendency for land conversions to occur at the local-scale.

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

    There has been increasing interest in the use of market-based approaches to add value for forestland and to assist with the conservation of natural resources. While markets for ecosystem services show potential for increasing forestland value, there is concern that the lack of an integrated program will simply add to the complexity of these services without generating significant public benefits.

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

    Mechanical treatment of vegetation is done on public and private lands for many possible reasons, including enhancing wildlife habitat, increasing timber growth of residual stands, and improving resistance to damaging pests. Few studies, however, have focused on the circumstances under which mechanical wildfire hazard reduction treatments can yield positive net economic wildfire benefits for landowners and managers.

  8. Library Resource
    Articles et Livres
    décembre, 2012
    Canada, États-Unis d'Amérique, Amérique septentrionale

    Public land management across North America now incorporates multiple ecological and social values and has led to use of increasingly complex silvicultural systems, such as those designed to emulate natural disturbance regimes, in an effort to manage for this wider variety of objectives. In the eastern United States and Canada, canopy gap-based silvicultural systems are often used to promote and sustain intra-stand variability in temporal and spatial patterns.

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

    This research addressed the temporal and spatial variation of soil moisture (SM) in a heterogeneous landscape. The research objective was to investigate soil moisture variation in eight homogeneous 30 by 30m plots, similar to the pixel size of a Landsat Thematic Mapper (TM) or Enhanced Thematic Mapper plus (ETM+) image. The plots were adjacent to eight stations of an in situ soil moisture network operated by the United States Department of Agriculture-Agriculture Research Service USDA-ARS in Tifton, GA.

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

    Public forest management requires consideration of numerous objectives including protecting ecosystem health, sustaining habitats for native communities, providing sustainable forest products, and providing noncommodity ecosystem services. It is difficult to evaluate the long-term, cumulative effects and tradeoffs these and other associated management objectives.

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