Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 51.
  1. Library Resource
    Articles et Livres
    décembre, 2017
    Global

    The PREDICTS project—Projecting Responses of Ecological Diversity In Changing
    Terrestrial Systems (www.predicts.org.uk)—has collated from published studies a
    large, reasonably representative database of comparable samples of biodiversity
    from multiple sites that differ in the nature or intensity of human impacts relating to
    land use. We have used this evidence base to develop global and regional statistical
    models of how local biodiversity responds to these measures. We describe and

  2. Library Resource
    Articles et Livres
    août, 2014
    France, Royaume-Uni, Kenya, États-Unis d'Amérique, Afrique orientale, Amérique septentrionale, Europe septentrionale, Europe occidentale

    Biodiversity continues to decline in the face of increasing anthropogenic pressures such as habitat destruction, exploitation, pollution and introduction of alien species. Existing global databases of species’ threat status or population time series are dominated by charismatic species. The collation of datasets with broad taxonomic and biogeographic extents, and that support computation of a range of biodiversity indicators, is necessary to enable better understanding of historical declines and to project – and avert – future declines.

  3. Library Resource
    Articles et Livres
    décembre, 2016
    Thaïlande

    Tropical mangrove forests can play an important role in the functioning of adjacent marine ecosystems, by protecting them from an excess in land‐derived sediment and nutrients. The strength of this interaction may however depend on the nutrient status of the mangrove forest. This study related the nutrient status of eight mangrove forests in Phang Nga Bay (Thailand) to the land‐cover distributions in the upstream catchment areas.

  4. Library Resource
    Articles et Livres
    décembre, 2009
    Somalie

    Soil loss is a major concern for land managers due to its influence on biomass production, surface water quality and landscape beauty. In Somalia, the risk of soil loss is accelerated by the removal of vegetation, bad land use practices and negative impacts of urbanization. The political upheavals and consequent insecurity in the country are major limitations for detailed database and research in soil loss.

  5. Library Resource
    Articles et Livres
    décembre, 2009

    An assessment of sensitivity to land degradation has been carried out in the Extremadura region, SW Spain, by means of a modelling approach developed by the European Commission funded MEDALUS project (Mediterranean Desertification and Land Use) which identifies such areas on the basis of an index (Environmentally Sensitive Area index, ESA index) that incorporates data on environmental quality (climate, vegetation, soil) as well as anthropogenic factors (management).

  6. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    Impacts of land use and climate change on runoff were investigated by studying the runoff in the Yarlung Zangbo River basin, China. Trends in precipitation, mean air temperature, and runoff were analysed by non‐parametric Mann‐Kendall tests. Land‐use changes were examined with land‐use transition matrix and geographic information system tools. Land‐use and climate changes showed several characteristics, including increased reforestation, decreased grassland, retreat of glaciers and increased desertification.

  7. Library Resource
    Articles et Livres
    décembre, 2015
    Chine

    The interaction between land use/cover change and landscape pattern is pivotal in research concerning global environmental change. This study uses three different Landsat images of 1989, 1998 and 2009 to study the land use/cover and landscape pattern changes in the middle reaches of the Tarim River basin. envi®, erdas®, ArcGIS® and fragstats® software were used to analyse the land use/cover changes. The objectives of study were to map and study the changes in land use/cover and landscape pattern, and propose some possible factors in making the land use/cover changes from 1989 to 2009.

  8. Library Resource
    Articles et Livres
    décembre, 2015

    Using an overall document data comprehensive analysis system and a structure analysis, this study preliminarily classified technical indicators, structured the regulatory index database on construction of land reclamation, and explicated the information operation process and main content of land reclamation. From the perspective of module design, this article describes the most significant details about information query and release process, engineering construction quality monitoring and control, the land reclamation engineering acceptance process, and post‐project evaluation.

  9. Library Resource
    Articles et Livres
    décembre, 2014
    Monténégro

    To study the magnitude of land degradation, desertification or resilience in Montenegro throughout the 20th and early‐21st centuries, we rephotographed the landscapes recorded on 48 historical photographs dating back to between 1890 and 1985, and analysed in a semi‐quantitative way the land use and cover changes that had occurred using an expert rating system (six correspondents). Time‐series of hydrology and population density were analysed for the period since 1948 and were compared with the changes observed using repeat photography.

  10. Library Resource
    Articles et Livres
    décembre, 2014
    Éthiopie

    The combined effects of erosive rains, steep slopes and human land use have caused severe land degradation in the Ethiopian Highlands for several thousand years, but since the 1970s, however, land rehabilitation programmes have been established to try to reverse deterioration. In order to characterize and quantify the transformations in the north Ethiopian Highlands, a study was carried out over 8884 km² of the Tigray Highlands of northern Ethiopia.

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