Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 180.
  1. Library Resource
    Articles et Livres
    décembre, 2016
    Argentine, Burkina Faso, République centrafricaine, Chine, Cameroun, Algérie, Érythrée, Éthiopie, Mali, Mauritanie, Niger, Nigéria, Soudan, Sénégal, Soudan du Sud, Tchad, Asie central

    It took scientists more than three decades to transform a perceived desertification crisis in the Sahel into a non-event. Looking beyond the Sahel, the chapters in this book provide case studies from around the world that examine the use and relevance of the desertification concept.

  2. Library Resource

    Volume 10 Issue 2

    Publication évaluée par des pairs
    février, 2021
    Bosnie-Herzégovine, Colombie, États-Unis d'Amérique

    Cattle grazing and fire are common types of management on natural ecosystems, generating several threats to the conservation of native vegetation (e.g., changes in species richness, cover, and abundance, mainly of bovine-palatable species). In this work, we analysed the response of the structure and composition of vegetation managed with different cattle stocking rates and fire in the savanna ecosystems of Colombia. The study was located in the eastern area of the Llanos region, where savannas were subjected to grazing and burning.

  3. Library Resource

    Volume 10 Issue 2

    Publication évaluée par des pairs
    février, 2021
    Argentine, Terres australes et antarctiques françaises, Brésil, Canada, Espagne, Paraguay, États-Unis d'Amérique, Amérique du Sud

    The stabling of livestock farming implies changes in both local ecosystems (regeneration of forest stands via reduced grazing) and those located thousands of kilometers away (deforestation to produce grain for feeding livestock). Despite their importance, these externalities are poorly known. Here we evaluated how the intensification and confinement of livestock in Spain has affected forest surface changes there and in South America, the largest provider of soybeans for animal feed to the European Union.

  4. Library Resource

    Revista de la CEPAL

    Articles et Livres
    décembre, 2000
    Mexique

    Desde 1988 el sector ejidatario mexicano se ha visto afectado
    por una serie de cambios de política y perturbaciones exógenas
    que han puesto en tela de juicio la viabilidad agrícola del
    sector en su conjunto. Los cambios --liberalización del comercio,
    privatización, reducción de los subsidios, eliminación
    de los controles de precios, perturbaciones macroeconómicas,
    devaluación y grandes reformas del marco legal que rige el
    uso de la tierra en los ejidos-- han llevado a un reordenamiento

  5. Library Resource

    CEPAL Review

    Articles et Livres
    décembre, 2000
    Mexique

    Since 1988 the ejido sector in Mexico has been buffeted by a series of policy changes and exogenous shocks that have brought into question the agricultural viability of the sector as a whole. These changes -trade liberalization, privatization, falling subsidies, the abolition of price controls, macroeconomic shocks, devaluation and momentous changes in the legal framework governing land use in the ejido- have led to a radical reordering of the policy framework and incentive structure under which the farmers of these communal lands operate.

  6. Library Resource

    Land Use Policy Volume 75

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

    Discussions about climate change have repeatedly regarded livestock as responsible for a significant contribution of greenhouse gas emissions. However, proper management schemes for livestock production may contribute to a reduction in emissions and, at the same time, induce optimization of production systems and intensification of food production.

  7. Library Resource

    Volume 9 Issue 12

    Publication évaluée par des pairs
    décembre, 2020
    Mexique, États-Unis d'Amérique

    Rangeland management in former tropical rainforest areas may affect ecosystem services. We hypothesized that management practices like burning and overgrazing reduce supporting (soil quality) and consequently also provisioning (forage productivity and quality) and regulating (nutrient cycling) ecosystem services.

  8. Library Resource

    Volume 9 Issue 9

    Publication évaluée par des pairs
    septembre, 2020
    Colombie, Portugal, États-Unis d'Amérique

    Nine Latin American countries plan to use silvopastoral practices—incorporating trees into grazing lands—to mitigate climate change. However, the cumulative potential of scaling up silvopastoral systems at national levels is not well quantified. Here, we combined previously published tree cover data based on 250 m resolution MODIS satellite remote sensing imagery for 2000–2017 with ecofloristic zone carbon stock estimates to calculate historical and potential future tree biomass carbon storage in Colombian grasslands.

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