Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 344.
  1. Library Resource
    Publication évaluée par des pairs
    mars, 2015
    Canada

    Canadian forests are often perceived as pristine and among the last remaining wilderness, but the majority of them are officially managed and undergo direct land use, mostly for wood harvest. This land use has modified their functions and properties, often inadvertently (e.g., age structure) but sometimes purposefully (e.g., fire suppression). Based on a review of the literature pertaining to carbon cycling, climate regulation, and disturbances from logging, fire, and insect outbreaks, we propose five scientific principles relevant for Canadian managed forests.

  2. Library Resource

    Volume 6 Issue 3

    Publication évaluée par des pairs
    octobre, 2017
    États-Unis d'Amérique

    Pollinators provide critical ecosystems services vital to the production of numerous crops in the United States’ agricultural sector. However, the U.S. is witnessing a serious decline in the abundance and diversity of domestic and wild pollinators, which threatens U.S. food security. In response, the U.S. Department of Agriculture has created the Pollinator Habitat Initiative (CP-42) to induce landowners to create quality habitat for pollinators by planting beneficial crops and wildflowers on Conservation Reserve Program (CRP)-eligible land.

  3. Library Resource

    Volume 6 Issue 3

    Publication évaluée par des pairs
    octobre, 2017
    Brésil, Chine, États-Unis d'Amérique

    The telecoupling framework is an integrated concept that emphasises socioeconomic and environmental interactions between distant places. Viewed through the lens of the telecoupling framework, land use and food consumption are linked across local to global scales by decision-making agents and trade flows. Quantitatively modelling the dynamics of telecoupled systems like this could be achieved using numerous different modelling approaches.

  4. Library Resource

    Volume 6 Issue 4

    Publication évaluée par des pairs
    décembre, 2017
    Groenland

    The increase of summer temperatures and a prolonged growing season increase the potential for agricultural land use for subarctic agriculture. Nevertheless, land use at borderline ecotones is influenced by more factors than temperature and the length of the growing season, for example soil quality, as the increasing lengths of dry periods during vegetation season can diminish land use potential. Hence, this study focuses on the quality of the soil resource as possible limiting factor for land use intensification in southern Greenland.

  5. Library Resource

    Volume 6 Issue 4

    Publication évaluée par des pairs
    décembre, 2017
    Amérique septentrionale

    A field characterization of the grassland vegetation structure, represented by the coverage of grass canopy (CGC) and the grass height, was carried out during three years (2009–2011) in a priority area for the conservation of grasslands of North America. Landsat Thematic Mapper (TM5) images were selected and the information of reflectance was obtained based on the geographical location of each field-sampling site.

  6. Library Resource

    Volume 7 Issue 2

    Publication évaluée par des pairs
    juin, 2018
    États-Unis d'Amérique

    Wildlands are increasingly lost to human development. Conservation scientists repeatedly call for protecting the remaining wildlands and expanding the land area protected in reserves. Despite these calls, conservation reserves can be eliminated through legislation that demotes their conservation status. For example, legislation introduced to the Congress of the United States recently would demote 29 Wilderness Study Areas (WSAs) from the protections afforded by their existing status.

  7. Library Resource

    Volume 7 Issue 3

    Publication évaluée par des pairs
    septembre, 2018
    Afrique du Sud, Australie, États-Unis d'Amérique, Afrique australe

    There is a growing recognition of the contribution that privately-owned land makes to conservation efforts, and governments are increasingly counting privately protected areas (PPAs) towards their international conservation commitments. The public availability of spatial data on countries’ conservation estates is important for broad-scale conservation planning and monitoring and for evaluating progress towards targets.

  8. Library Resource

    Volume 7 Issue 4

    Publication évaluée par des pairs
    décembre, 2018
    États-Unis d'Amérique

    Small protected areas dominate some databases and are common features of landscapes, yet their accumulated contributions to biodiversity conservation are not well known. Small areas may contribute to global biodiversity conservation through matrix habitat improvement, connectivity, and preservation of localized ecosystems, but there is relatively little literature regarding this. We review one database showing that the average size of nearly 200,000 protected areas in the United States is ~2000 ha and the median is ~20 ha, and that small areas are by far the most frequent.

  9. Library Resource

    Volume 7 Issue 4

    Publication évaluée par des pairs
    décembre, 2018
    États-Unis d'Amérique

    Municipalities across the United States are prioritizing green stormwater infrastructure (GSI) projects due to their potential to concurrently optimize the social, economic, and environmental benefits of the “triple bottom line”. While placement of these features is often based on biophysical variables regarding the natural and built environments, highly urbanized areas often exhibit either limited data or minimal variability in these characteristics.

  10. Library Resource

    Volume 7 Issue 4

    Publication évaluée par des pairs
    décembre, 2018
    États-Unis d'Amérique

    Soil databases are very important for assessing ecosystem services at different administrative levels (e.g., state, region etc.). Soil databases provide information about numerous soil properties, including soil inorganic carbon (SIC), which is a naturally occurring liming material that regulates soil pH and performs other key functions related to all four recognized ecosystem services (e.g., provisioning, regulating, cultural and supporting services). However, the ecosystem services value, or “true value,” of SIC is not recognized in the current land market.

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