Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 171.
  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
    Articles et Livres
    décembre, 2016
    Géorgie, États-Unis d'Amérique

    Geographically isolated wetlands (GIWs) are common features of the Dougherty Plain physiographic region in southwestern Georgia. Due to lack of protection at the state and federal levels, these wetlands are threatened by intensive agricultural and silvicultural land uses common in the region.

  3. Library Resource
    Articles et Livres
    décembre, 2016
    États-Unis d'Amérique

    Flood regulation is a widely valued and studied service provided by watersheds. Flood regulation benefits people directly by decreasing the socio-economic costs of flooding and indirectly by its positive impacts on cultural (e.g., fishing) and provisioning (e.g., water supply) ecosystem services. Like other regulating ecosystem services (e.g., pollination, water purification), flood regulation is often enhanced or replaced by technology, but the relative efficacy of natural versus technological features in controlling floods has scarcely been examined.

  4. Library Resource
    Articles et Livres
    décembre, 2016
    États-Unis d'Amérique

    QUESTION: The decline and loss of perennial vegetation in dryland ecosystems due to global change pressures can alter ecosystem properties and initiate land degradation processes. We tracked changes of perennial vegetation using remote sensing to address the question of how prolonged drought and land‐use intensification have affected perennial vegetation cover across a desert region in the early 21st century? LOCATION: Mojave Desert, southeastern California, southern Nevada, southwestern Utah and northwestern Arizona, USA.

  5. Library Resource
    Articles et Livres
    décembre, 2016
    Canada

    Facing increasing levels of ecosystem degradation, scientists and practitioners aim to preserve ecological integrity — to maintain structures and functions expected of ecosystems in a region. This requires an understanding of the relationship between structural components and functional integrity. In this paper we focused on the study forests of the Credit River Watershed (Southern Ontario, Canada).

  6. Library Resource
    Articles et Livres
    décembre, 2016
    États-Unis d'Amérique

    In much of the United States and elsewhere, urbanization continues to transform landscapes. In central Texas, anthropogenic conversion of land is due in part to a rapidly growing population in the Austin and San Antonio metro areas and the subsequent infrastructure and resources needed to support that growth. Protected natural areas adjacent to urbanized landscapes are often intended to mitigate the impact of land development by serving as wildlife habitat.

  7. Library Resource
    Articles et Livres
    décembre, 2016
    États-Unis d'Amérique

    The increase of global urbanization can have effects on wildlife species, including carnivores such as coyotes (Canis latrans). As coyotes continue to settle in more urban areas, reports of human-coyote conflicts, such as attacks on humans or pets, may also increase. Understanding environmental variables that might influence whether or not coyotes and human-coyote conflicts will occur in certain urban areas may assist wildlife officials in creating management plans for urban wildlife.

  8. Library Resource
    Articles et Livres
    décembre, 2016
    Amérique septentrionale

    CONTEXT: Weather surveillance radars (WSR) have been used to locate roost sites used by Purple Martins (Progne subis) for decades. Improvements in radar data processing and accessibility now make it possible to monitor roosts over a broad spatial scale. OBJECTIVES: We sought to locate all of the Purple Martin roosts in North America and to use the data to evaluate (1) the land cover types associated with roosts (2) relationships among roost persistence, land cover type, and regional population trends.

  9. Library Resource
    Articles et Livres
    décembre, 2016
    États-Unis d'Amérique

    CONTEXT: The urban heat island (UHI) is a well-documented pattern of warming in cities relative to rural areas. Most UHI research utilizes remote sensing methods at large scales, or climate sensors in single cities surrounded by standardized land cover. Relatively few studies have explored continental-scale climatic patterns within common urban microenvironments such as residential landscapes that may affect human comfort.

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