Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 161.
  1. Library Resource
    Articles et Livres
    décembre, 2017

    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
    août, 2016
    Bolivie, Paraguay, Brésil, Argentine, Amérique du Sud

    Different drivers and places of land use change in South America have often been studied in isolation. Evidence suggests, however, that in many instances, both places and drivers are becoming increasingly interconnected. The growing diversification and internationalization of agricultural commodity chains is creating new linkages across production frontiers and sectors that have important implications for conservation.

  4. Library Resource
    Articles et Livres
    décembre, 2015

    Baillonella toxisperma, Pentaclethra macrophylla and Trichoscypha abut are important foods for communities living around forests in Cameroon. Information on the nutritional value and bioactive content of these foods is required to establish their contribution to the nutrition and health of the communities. Samples of the three foods were obtained from four villages in east and three villages in south Cameroon. The foods were analyzed for proximate composition, minerals and bioactive content using standard chemical analysis methods. T.

  5. Library Resource
    Articles et Livres
    décembre, 2015

    The reliance on groundwater for irrigation is increasing in Australia and India, which is causing concerns to policy makers about energy consumption and greenhouse gas (GHG) emissions. Therefore, it is important to quantify the GHG emissions of all components of the groundwater-based irrigation systems, over the entire life cycle to develop more environmentally friendly groundwater management strategies. This study identified and analysed energy use and GHG emissions associated with different components in the supply chain of groundwater-based irrigation systems.

  6. Library Resource
    Documents et rapports de conférence
    décembre, 1992

    Two greenhouse experiments were conducted to investigate the effect of phosphorus application and Rhizobium inoculation on the growth and nitrogen fixation of three tree legume species on a highland vertisol. The first experiment involved Sesbania sesban and S. goetzei, the second Leucaena paniculata and L. leucocephala, both with varying levels of nitrogen applied. Growth and dry-matter production were assessed at 3 months after planting.

  7. Library Resource
    Articles et Livres
    décembre, 2015

    Process controls on water, sediment, nutrient, and organic carbon exports from the landscape through runoff are not fully understood. This paper provides analyses from 446 sites worldwide to evaluate the impact of environmental factors (MAP and MAT: mean annual precipitation and temperature; CLAY and BD: soil clay content and bulk density; S: slope gradient; LU: land use) on annual exports (RC: runoff coefficients; SL: sediment loads; TOCL: organic carbon losses; TNL: nitrogen losses; TPL: phosphorus losses) from different spatial scales.

  8. Library Resource
    Articles et Livres
    décembre, 2015

    Hydrological classification systems seek to provide information about the dominant processes in the catchment to enable information to be transferred between catchments. Currently, there is no widely agreed‐upon system for classifying river catchments. This paper develops a novel approach to classifying catchments based on the temporal dependence structure of daily mean river flow time series, applied to 116 near‐natural ‘benchmark’ catchments in the UK. The classification system is validated using 49 independent catchments.

  9. Library Resource
    Articles et Livres
    décembre, 2012

    This paper presents an interactive web‐based rapid assessment tool that generates key water related indicators to support decision making by stakeholders in land use planning. The tool is built on a consistent science based method that combines remote sensing with hydrological and socioeconomic analyses. It generates transparent, impartial, and verifiable information regarding the impact of land use changes on water productivity, water consumption, water availability, and employment.

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