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Showing items 1 through 9 of 9514.
  1. Library Resource
    Articles et Livres
    décembre, 2016
    États-Unis d'Amérique

    In northern New Mexico, complex interactions among climate, land use, and the associated reduction of surface fire in forest and savanna communities facilitated the expansion of piñon-juniper woodlands. Because increasing tree cover can outcompete herbaceous vegetation (e.g., forbs and grasses), woodland expansion resulted in reduced herbaceous cover and increased soil exposure, leading to increased runoff and erosion.

  2. Library Resource
    Documents et rapports de conférence
    septembre, 2011
    Chine

    Using a panel dataset from Zhejiang province in China over the period 1995-2002, wepropose a two-step estimation procedure to investigate the links between land lease activityand production efficiency. We find that the output elasticity with respect to land, the scaleeffect and the technical efficiency are higher for farmers involved in land-lease activities.

  3. Library Resource
    Documents et rapports de conférence
    décembre, 2008
    Guinée

    L’objectif de la présente étude est d’évaluer la diffusion et l’adoption des variétés de riz NERICA en Guinée cinq années après leur introduction. Les données collectées en 2002 sont relatives à 1535 paysans choisis dans 79 villages des quatre régions naturelles de la Guinée. L’approche d’estimation du taux d’adoption utilisée dans ce papier se fonde sur les théories modernes d’évaluation au niveau micro-économique des impacts d’interventions politiques.

  4. Library Resource
    Documents et rapports de conférence
    décembre, 2004
    Pérou, Honduras, Amérique centrale, Amérique du Sud

    We evaluate the impact of agricultural land market liberalization policies in Latin America by empirically examining the degree to which the reforms have broken down the dependence of operational area on owned area. We use panel data sets from Honduras and Peru to estimate the relationship between operational and owned land holdings for pre and post reform periods.

  5. Library Resource
    Articles et Livres
    décembre, 2013
    France

    To predict the impact of environmental change on species distributions, it has been hypothesized that community-level models could give some benefits compared to species-level models. In this study we have assessed the performance of these two approaches. We surveyed 256 bird communities in an agricultural landscape in southwest France at the same locations in 1982 and 2007.

  6. Library Resource
    Articles et Livres
    décembre, 2013
    Afrique

    Studies of the impact of human activity on vegetation dynamics of the Sahelian belt of Africa have been recently re-invigorated by new scientific findings that highlighted the primary role of climate in the drought crises of the 1970s–1980s. Time series of satellite observations revealed a re-greening of the Sahelian belt that indicates no noteworthy human effect on vegetation dynamics at sub continental scale from the 1980s to late 1990s.

  7. Library Resource
    Articles et Livres
    décembre, 2013
    Chine

    Neo-liberal observers have frequently raised the red alert over insecure property rights in developing and emerging economies. Development would be at a crossroads: either institutional structure needs changing or it risks a full-fledged collapse. Yet, instead of focusing on the enigma between economic growth versus ‘perverse’ institutions, this contribution posits a functionalist argument that the persistence of institutions points to their credibility. In other words, once institutions persist they fulfill a function for actors.

  8. Library Resource
    Articles et Livres
    décembre, 2016

    The article examines the impact of institutional transformations on changing relations between subjects in the agrariansector. Due to the vital need for strategic development of agrarian sector, we should find new solutions to problems of jointfunctioning entities. In conditions of risky farming, formation of cross-sectoral organizations and informal institutions, solvingproblems of irrigated lands may become a practical solution to the problem.

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