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Résultats de la recherche

Showing items 1 through 9 of 372.
  1. Library Resource
    Articles et Livres
    avril, 2017

    Although REDD+ is approaching its 10th anniversary, major impacts in terms of reduced forest loss are hard to document. Conservation practitioners and scholars are therefore increasingly asking why REDD+ has not delivered more tangible results. A recent Comment in Conservation Biology by Fletcher et al. (2016) addresses this question. We agree with Fletcher et al. that REDD+ has been hyped in some circles, which has created unrealistic expectations among policy makers and forest dwellers alike. Yet, we argue that Fletcher et al.

  2. Library Resource
    Articles et Livres
    décembre, 2017

    Wetlands are important providers of ecosystem services and key regulators of climate change. They positively contribute to global warming through their greenhouse gas emissions, and negatively through the accumulation of organic material in histosols, particularly in peatlands. Our understanding of wetlands’ services is currently constrained by limited knowledge on their distribution, extent, volume, interannual flood variability and disturbance levels.

  3. Library Resource
    Articles et Livres
    août, 2018
    Afrique australe, Afrique

    Empirical scientific evidence indicates that there is still room for increasing food production by improving land productivity. This study aimed at identifying the key determinants that govern farmers’ decisions to adopt multiple components of integrated soil fertility management (ISFM) in a maize mixed cropping system of the Chinyanja Triangle, Southern Africa.

  4. Library Resource
    Articles et Livres
    décembre, 2010

    Estimates of the percent of Earth's land surface that has either been transformed or degraded by human activity range between 39 and 50 percent, with agriculture accounting for the vast majority of these changes. Although much of the focus of research on land use and cover change in the tropics has been on deforestation, ongoing socioeconomic changes both locally and globally have made land transitions in the tropics extremely fluid. In addition, feedbacks between land cover change and human behavior constrain the extent and trajectories of land transitions.

  5. Library Resource
    Articles et Livres
    décembre, 2007
    République-Unie de Tanzanie

    Livestock encroachment is threatening the populations of large wild mammals in Tanzania. Competition for quality grazing land by domestic stocks is one of the main factors impacting wild species during this encroachment. In the Kilombero Game Controlled Area (KGCA), extensive livestock husbandry is negatively associated with wildlife populations, especially outside the hunting season. This study assessed the relationship between livestock number and the abundance of three wild species: puku, buffalo and elephant.

  6. Library Resource
    Articles et Livres
    décembre, 2006

    This article examines economic efficiency (EE) of crop production of Russian corporate farms for 1993-1998. EE declined over the period, due to declines in both technical and allocative efficiency. Technical efficiency (TE) results indicate that output levels could have been maintained while reducing overall input use by an average of 29-31% in 1998, depending on the method used, while the allocative efficiency (AE) results show that costs could have been reduced about 30%.

  7. Library Resource
    Articles et Livres
    décembre, 2012

    1. Arctic vegetation tends to be spatially heterogeneous and can have large areas of mixed ‘transition zone’ vegetation between stands dominated by a single or few species. If plant photosynthesis and growth within these transition zones differs significantly from main vegetation stands, and if transition zones are not considered when extrapolating stand‐level findings to larger scales in space, then transition zones will provide considerable error to landscape‐level estimates of gross primary productivity (GPP).

  8. Library Resource
    Articles et Livres
    décembre, 2007
    Australie

    Offsets (also known as mitigation banks, compensatory habitat, set-asides) is a policy instrument recently introduced in several States in Australia to permit some land clearing while striving for no net loss in the extent and condition of native vegetation overall. Offsetting is criticized with respect to the amount of gain required to compensate for losses from clearing, the equivalence of losses and gains, the time lag between losses and gains and a poor record of compliance.

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