Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 160.
  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
    Articles et Livres
    avril, 2017
    Chine, Asie orientale

    Context: Recent conceptual developments in ecosystem services research have revealed the need to elucidate the complex and unintended relationships between humans and the environment if we are to better understand and manage ecosystem services in practice.

    Objectives: This study aimed to develop a model that spatially represents a complex human–environment (H–E) system consisting of heterogeneous social–ecological components and feedback mechanisms at multiple scales, in order to assess multi-dimensional (spatial, temporal, and social) trade-offs in ecosystem services.

  3. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    The effects of land use policy and socioeconomic changes on urban landscape dynamics have been increasingly investigated around the world, but our knowledge of the underlying processes of these effects is still inadequate for sustainably managing urban ecosystems.

  4. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    The semi-arid grasslands in Inner Mongolia, China have been degraded by long-term grazing. A series of ecological restoration strategies have been implemented to improve grassland service. However, little is known about the effect of these ecological restoration practices on soil carbon and nitrogen storage.

  5. Library Resource
    Articles et Livres
    décembre, 2013
    Chine

    This paper analyzes increasingly individualized herding behavior after the implementation of a grazing ban policy in northern China based on empirical research in 12 pastoralist villages. The findings reveal that de-collectivization of pastureland has not necessarily led to direct changes in individual land use strategies.

  6. Library Resource
    Articles et Livres
    décembre, 2013
    Chine

    Despite the growing awareness of the important ecological functions and values provided by coastal and estuarine wetlands, wetland degradation continues worldwide due to increasing anthropogenic disturbances. Chongming Dongtan wetlands, adjacent to Shanghai, the largest city and industrial and trading port in China in rapid urban expansion and socioeconomic development are currently threatened with biodiversity reduction, wetland loss, contamination, and invasion of exotic plant.

  7. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    BACKGROUND AND AIMS: Stoichiometric relations drive powerful constraints on many ecosystem processes. However, our understanding of the hierarchical responses of plant C:N:P stoichiometry at different levels of biological organization to global change factors remains limited. METHODS: we examined the plant C:N:P stoichiometric responses to N deposition and mowing (hay making) at both species- and community-level by carrying out a 4-year field experiment in the temperate steppe of northern China.

  8. Library Resource
    Articles et Livres
    décembre, 2012
    Chine, Mongolie, Asie orientale

    The Mongolian plateau in East Asia is part of a new hotspot of land cover change. Recent human activity and natural forces have degraded grasslands in northern China with the southern Mongolia steppe similarly vulnerable. Investigating vegetation patterns at piospheres (the area around water points) can identify herder influence on pasture conditions. Through fieldwork and remote sensing this paper examines plant density and species richness at water sources to establish land cover patterns in two Mongolian provinces where overgrazing is thought to be the major cause of degradation.

  9. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    China’s economic development over the past three decades has been remarkable due to the establishment of the “Reform and Opening-up” program. Meanwhile, urbanization, one of the most intensive human activities, has significantly changed the land cover across China. Here we used remote sensing data and landscape metrics to explore the spatiotemporal patterns of urbanization in two large Chinese cities, Chengdu (1978–2010) and Chongqing (1976–2010).

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