Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 20.
  1. 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%.

  2. Library Resource
    Articles et Livres
    décembre, 2006
    Espagne

    Question: Small and marginal forest populations are a focus of attention because of their high biodiversity value as well as the risk of population decline and loss. In this context, we ask to what extent a small, marginal Quercus suber (Cork oak) population located in the eastern Iberian Peninsula (Valencia, Spain) has the capacity for self‐regeneration and what are the factors that determine its recruitment variability. Location: Quercus suber forest in Pinet (Valencia, Spain).

  3. Library Resource
    Articles et Livres
    décembre, 2006

    Across many dryland regions, historically grass-dominated ecosystems have been encroached upon by woody-plant species. In this paper, we compare ecosystem water and carbon dioxide (CO₂) fluxes over a grassland, a grassland-shrubland mosaic, and a fully developed woodland to evaluate potential consequences of woody-plant encroachment on important ecosystem processes. All three sites were located in the riparian corridor of a river in the southwest US. As such, plants in these ecosystems may have access to moisture at the capillary fringe of the near-surface water table.

  4. Library Resource
    Articles et Livres
    décembre, 2006
    Afrique

    Contemporary discourse on land in Africa is polarized between advocates of tenure reform through state registration of individual titles to land and others who claim that customary or 'communal' tenure is the only check against landlessness among the poor in the African countryside, and that 'pro-poor' land policy should therefore strengthen customary rights to land.

  5. Library Resource
    Articles et Livres
    décembre, 2006

    Nine midwestern states have laws that restrict the involvement of publicly held corporations in agriculture. Opponents argue that the laws' direct efforts to regulate ownership structure may have an adverse indirect impact on size structure. Restricting corporate involvement might stifle the emergence and growth of efficient, large-scale establishments if corporations have advantages over other organizational forms in meeting capital requirements. Since 1982, Nebraska has had an anti-corporate farming law that prohibits corporate ownership of feedlots.

  6. Library Resource
    Articles et Livres
    décembre, 2006

    Using environmental indices (EIs) to rank applications for enrollment in conservation programs is becoming common practice. However, there is little guidance on how it should be done. The indices adopted by existing programs have often been linear, using weighted averages of environmental parameters without explicit consideration of whether they represent a reliable preference ordering on environmental states. Our article investigates society's weights for addressing multiple resource concerns and how functional forms of EIs can influence program outcomes.

  7. Library Resource
    Articles et Livres
    décembre, 2006
    République-Unie de Tanzanie

    Boulengerula uluguruensis is a terrestrial caeciliid caecilian described from the Uluguru Mountains of Tanzania. We investigated the relative abundance of B. uluguruensis in agricultural and forested habitats at the beginning of the rainy season. This caecilian was found over a wide altitudinal range (450–1175 m a.s.l.), and in many land cover types (including natural forest, plantation forest and small scale agriculture), and different soil textures (including very compact soil). Based on quantitative and semi‐quantitative surveys, B.

  8. Library Resource
    Articles et Livres
    décembre, 2006
    Afrique

    Recent observations show that human-induced climate change (CC) and land transformation (LT) are threatening wildlife globally. Thus, there is a need to assess the sensitivity of wildlife on large spatial scales and evaluate whether national parks (NPs), a key conservation tools used to protect species, will meet their mandate under future CC and LT conditions. Here, we assess the sensitivity of 277 mammals at African scale to CC at 10[prime] resolution, using static LT assumptions in a 'first-cut' estimate, in the absence of credible future LT trends.

  9. Library Resource
    Articles et Livres
    décembre, 2006
    Porto Rico

    We studied the ecological characteristics of 45-50-yr-old subtropical dry forest stands in Puerto Rico that were growing on sites that had been deforested and used intensively for up to 128 yr. The study took place in the Guánica Commonwealth Forest. Our objective was to assess the long-term effects of previous land use on this forest--i.e., its species composition, structure, and functioning. Previous land-use types included houses, farmlands, and charcoal pits. Stands with these land uses were compared with a nearby mature forest stand.

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