Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 15.
  1. Library Resource
    Articles et Livres
    décembre, 2010
    États-Unis d'Amérique

    Protected areas are crucial for biodiversity conservation because they provide safe havens for species threatened by land-use change and resulting habitat loss. However, protected areas are only effective when they stop habitat loss within their boundaries, and are connected via corridors to other wild areas. The effectiveness of protected areas is threatened by development; however, the extent of this threat is unknown.

  2. Library Resource
    Articles et Livres
    décembre, 2012
    Afrique

    Recent research underscores the continued importance of gender in rural Africa. Analysis of interactions within households is becoming more sophisticated and continues to reject the unitary model. There is some evidence of discriminatory treatment of girls relative to boys, although the magnitudes of differential investments in health and schooling are not large and choices seem quite responsive to changes in opportunity costs. Social norms proscribing and prescribing male and female economic behavior remain substantial, extending into many domains, especially land tenure.

  3. Library Resource
    Articles et Livres
    décembre, 2012

    Carbon exchange associated with accelerated erosion following land cover change is an important component of the global C cycle. In current assessments, however, this component is not accounted for. Here, we integrate the effects of accelerated C erosion across point, hillslope, and catchment scale for the 780-km ² Dijle River catchment over the period 4000 B.C. to A.D. 2000 to demonstrate that accelerated erosion results in a net C sink.

  4. Library Resource
    Articles et Livres
    décembre, 2011

    Accurately quantifying changes in soil carbon (C) stocks with land-use change is important for estimating the anthropogenic fluxes of greenhouse gases to the atmosphere and for implementing policies such as REDD (Reducing Emissions from Deforestation and Degradation) that provide financial incentives to reduce carbon dioxide fluxes from deforestation and land degradation. Despite hundreds of field studies and at least a dozen literature reviews, there is still considerable disagreement on the direction and magnitude of changes in soil C stocks with land-use change.

  5. Library Resource
    Articles et Livres
    décembre, 2015
    États-Unis d'Amérique

    The concept of nature as capital is gaining visibility in policies and practices in both the public and private sectors. This change is due to an improved ability to assess and value ecosystem services, as well as to a growing recognition of the potential of an ecosystem services approach to make tradeoffs in decision making more transparent, inform efficient use of resources, enhance resilience and sustainability, and avoid unintended negative consequences of policy actions.

  6. Library Resource
    Articles et Livres
    décembre, 2012
    Chine

    In China, and elsewhere, long-term economic development and poverty alleviation need to be balanced against the likelihood of ecological failure. Here, we show how paleoenvironmental records can provide important multidecadal perspectives on ecosystem services (ES). More than 50 different paleoenvironmental proxy records can be mapped to a wide range of ES categories and subcategories. Lake sediments are particularly suitable for reconstructing records of regulating services, such as soil stability, sediment regulation, and water purification, which are often less well monitored.

  7. Library Resource
    Articles et Livres
    décembre, 2011
    Malaisie

    Rising global demands for food and biofuels are driving forest clearance in the tropics. Oil-palm expansion contributes to biodiversity declines and carbon emissions in Southeast Asia. However, the magnitudes of these impacts remain largely unquantified until now. We produce a 250-m spatial resolution map of closed canopy oil-palm plantations in the lowlands of Peninsular Malaysia (2 million ha), Borneo (2.4 million ha), and Sumatra (3.9 million ha).

  8. Library Resource
    Articles et Livres
    décembre, 2011

    Agronomic intensification has transformed many agricultural landscapes into expansive monocultures with little natural habitat. A pervasive concern is that such landscape simplification results in an increase in insect pest pressure, and thus an increased need for insecticides. We tested this hypothesis across a range of cropping systems in the Midwestern United States, using remotely sensed land cover data, data from a national census of farm management practices, and data from a regional crop pest monitoring network.

  9. Library Resource
    Articles et Livres
    décembre, 2012

    With urban, agricultural, and industrial needs growing throughout the past decades, wetland ecosystems have experienced profound changes. Most critically, the biodiversity of wetlands is intimately linked to its hydrologic dynamics, which in turn are being drastically altered by ongoing climate changes. Hydroperiod regimes, e.g., percentage of time a site is inundated, exert critical control in the creation of niches for different plant species in wetlands.

  10. Library Resource
    Articles et Livres
    décembre, 2012

    This paper introduces urban land teleconnections as a conceptual framework that explicitly links land changes to underlying urbanization dynamics.

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