Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 9514.
  1. Library Resource
    Documents et rapports de conférence
    décembre, 1999

    A contingent valuation survey was conducted in two diverse Oregon counties to estimate potential enrollment of framed or grazed land in a riparian buffer strip program. Landowner preferences for various program components were elicited and demonstrate the need to carefully design conservation incentives to encourage participation.

  2. Library Resource
    Documents et rapports de conférence
    avril, 2009
    Europe

    Recent decades have witnessed substantial losses in biodiversity in Europe, partlydriven by the ecological changes associated with intensification of agriculturalproduction. These changes have particularly affected biodiversity in marginal areas,such as the uplands in UK, since habitat change has been greater than in lowlandzones. Livestock farming is the main land use in these areas, and economic viabilityof farmers substantially relies on income coming from agricultural subsidies and agrienvironmentalpayments.

  3. Library Resource
    Articles et Livres
    décembre, 2013
    Iran

    Green spaces considered natural remnants in urban environments play a key role in promoting environmental quality and forming a sustainable city. Nowadays, development of urban spaces has taken a hasty growth. In the meanwhile, the natural green spaces are severely damaged. The current study aims at investigating the trend of changes in green space of Tabriz City, the second large industrial city in Iran, on the basis of landscape ecology principles. In order to prepare the land-cover maps, Landsat TM and IRS LISS-III of the years 1989 and 2006 were applied.

  4. Library Resource
    Articles et Livres
    décembre, 2008

    Humans have fundamentally altered global patterns of biodiversity and ecosystem processes. Surprisingly, existing systems for representing these global patterns, including biome classifications, either ignore humans altogether or simplify human influence into, at most, four categories. Here, we present the first characterization of terrestrial biomes based on global patterns of sustained, direct human interaction with ecosystems. Eighteen “anthropogenic biomes” were identified through empirical analysis of global population, land use, and land cover.

  5. Library Resource
    Articles et Livres
    décembre, 2011
    Chine

    Oil exploitation and road development have strongly fragmented the coastal landscapes, leading to profound ecological consequences. The dynamic relationships between oil wells, roads, and landscape fragmentation indices in the Yellow River Delta, China were explored. Oil wells, roads and land cover were mapped from TM images in 1992, 2000, 2006, and 2009, respectively. Changes and relationships were compared among three selected typical sections using linear regression models.

  6. Library Resource
    Articles et Livres
    décembre, 2014

    The frequency and extent of human‐induced land‐cover changes is escalating worldwide. Recurrent turnover of land‐cover types will affect ecosystems over and above major, one‐time changes (eg deforestation). Here, we show how a deeper appreciation of the temporal dynamics of land‐cover change is needed to understand its effects on ecosystems.

  7. Library Resource
    Articles et Livres
    décembre, 2011
    Fédération de Russie

    Despite being recognized as a key baseline dataset for many applications, especially those relating to biogeochemical cycles, land cover products in their current form are limiting. Typically they lack the thematic detail necessary for driving the models that depend upon them. This study has demonstrated the ability to produce a highly detailed (both spatially and thematically) land cover/land use dataset over Russia – by combining existing datasets into a hybrid information system.

  8. Library Resource
    Articles et Livres
    décembre, 2011
    Égypte

    Sand dunes encroachment is a challenge that faces land development in North African countries. Movement of these dunes threatens cultivated lands, roads, and urban settlements. Geographic information system (GIS) provides a tool for cartographic modeling of risk of sand dunes encroachment. This study modeled the potential risk of sand dunes encroachment related to their terrain characteristics in the Western Desert of Egypt. The Food and Agricultural Organization's land cover map of Egypt derived from Landsat Thematic Mapper was used to locate the sand dunes bodies.

  9. Library Resource
    Articles et Livres
    décembre, 2011
    Laos

    This article examines the transition from shifting cultivation to rubber production for a study area in northern Laos PDR using an agent-based model of land-cover change. A primary objective of the model was to assess changes in household-level inequality with the transition from shifting cultivation to rubber adoption. A secondary objective was to develop explanations for the rate of rubber adoption in the study area.

  10. Library Resource
    Articles et Livres
    décembre, 2013

    The Curve Number (CN) method is an engineering and land management tool for estimating surface runoff from rainstorms. We investigated CN under continuous longterm no-till corn (Zea mays L.; watershed WS191) and compared it with other potentially high infiltration agricultural practices using data from three experimental watersheds (average area = 0.74 ha [1.83 ac]) at the North Appalachian Experimental Watershed (NAEW) near Coshocton, Ohio.

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