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Mostrando ítems 1 a 9 de 51243.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011
    Mongolia, Asia oriental

    Changing environmental and socio-economic conditions make land degradation, a major concern in Central and East Asia. Globally satellite imagery, particularly Normalized Difference Vegetation Index (NDVI) data, has proved an effective tool for monitoring land cover change. This study examines 33 grassland water points using vegetation field studies and remote sensing techniques to track desertification on the Mongolian plateau.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 2007

    The Office de la Haute Vallée du Fleuve Niger (OHVN) zone in southern Mali is a small but important agricultural production region. Against a background of environmental degradation including decades of declining rainfall, soil erosion, and human pressure on forest resources, numerous farming communities stand out through the use of improved soil and water management practices that have improved agricultural and environmental conditions. Field surveys conducted in 1998-2001 indicated that environmental and agricultural conditions have improved in the past decade.

  3. Library Resource
    Junio, 2012

    Following the endorsement of the Millennium Development Goals, there is an increasing demand for methods to track poverty regularly. This paper develops an economically intuitive and inexpensive methodology to do so in the absence of regular, comparable data on household consumption. The minimum data requirements for the methodology are the availability of a household budget survey and a series of surveys with a comparable set of asset data also contained in the budget survey. The methodology is illustrated using a series of Demographic Health Surveys from Kenya.

  4. Library Resource

    Land policy initiative

    Artículos de revistas y libros
    Junio, 2012

    Cognizant of the centrality of land policy issues in Africa, a joint initiative was undertaken by the African Union Commission (AUC), United Nations Economic Commission for Africa (ECA) and the African Development Bank (AfDB) in 2006, forming the genesis of the Land Policy Initiative (LPI). Through the LPI important actions and measures have been launched including a series of regional studies on land issues across Africa accompanied by rigorous consultations and discussions at regional and continental levels.

  5. Library Resource
    Agosto, 2012

    The demand for verifiable evidence of
    results and impacts of development agricultural programs and
    projects is growing. However, most of the indicators that
    development practitioners have traditionally used in
    tracking progress toward achieving projects' objectives
    focus on the workings of the development operation itself.
    These performance indicators relate mainly to lower-level
    inputs and outputs and are used to populate management

  6. Library Resource
    Documentos de conferencias e informes
    Junio, 2015
    China, Asia oriental

    Paddy rice agriculture affects food supply, climate, water, biodiversity, and ecosystems. It varies substantially over time and space, for example, continuous expansion in northeastern China and rapid loss in southern China in the past decades. However, no maps at fine spatial resolution (e.g., 30-m) are available to document and illustrate the spatial patterns and temporal dynamics of paddy rice planting areas in China.

  7. Library Resource
    Documentos de política y resúmenes
    Diciembre, 2004

    We establish a procedure to track the tax valuation history of properties that are fully or partially restricted with conservation easements to test the assertion that easements result in lower property valuations. Easements didn't decrease property valuations; they merely decreased the rate of value for the affected properties. On average, the restricted properties' valuations increased at a rate lower than did those for unrestricted properties - but not always, and certainly not uniformly.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 2007
    Bélgica, Europa

    Habitat loss and fragmentation are known to reduce patch sizes and increase their isolation, consequently leading to modifications in species richness and community structure. Calcareous grasslands are among the richest ecosystems in Europe for insect species. About 10% (1,150 ha) of the total area of a calcareous ridge region (Calestienne, Belgium) and its butterfly community was analysed over a timeframe of about 100 years.

  9. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009

    Phenology is the study of recurring life‐cycle events, classic examples being the flowering of plants and animal migration. Phenological responses are increasingly relevant for addressing applied environmental issues. Yet, challenges remain with respect to spanning scales of observation, integrating observations across taxa, and modeling phenological sequences to enable ecological forecasts in light of future climate change.

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