Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 542.
  1. Library Resource
    Articles et Livres
    décembre, 2016
    Serbie

    Important hydrological changes, or generally water resources changes, are being observed in Serbia, as well as in many other parts of the world. Many national and international projects and studies address climate change and its impact on water resources. Some focus solely on the impact of climate change, while others also assess the impact of land use changes and/or changes in human use of water.

  2. Library Resource
    Articles et Livres
    décembre, 2016
    Chine

    Soil erosion along with soil particles and nutrients losses is detrimental to crop production. We carried out a 5-year (2010 to 2014) study to characterize the soil erosion and nitrogen and phosphorus losses caused by rainfall under different fertilizer application levels in order to provide a theoretical evidence for the agricultural production and coordinate land management to improve ecological environment. The experiment took place under rotation cropping, winter wheat-summer maize, on a 15° slope purple soil in Chongqing (China) within the Three Gorges Region (TGR).

  3. Library Resource
    Articles et Livres
    décembre, 2016
    Éthiopie

    This study analyzes urban expansion and the peri-urban land tenure security situation in Amhara National Regional State of Ethiopia, taking Bahir Dar and Debre Markos as case studies. To detect the extent of urban expansion, data from Landsat satellite images were analyzed using ERDAS IMAGINE, ENVI, and ArcGIS segmentation, classification, and mapping tools. The land tenure security situation was assessed through interviews with local farmers.

  4. Library Resource
    Articles et Livres
    décembre, 2016

    Despite the potential to provide new insight into the underlying heterogeneity of urban thermal landscapes, local indicators of spatial autocorrelation (LISA) remains underutilized in land surface temperature (LST) related study. The present research applies local Moran's I as a unique approach to recognize the pattern of statistically significant LST increase by detecting clusters of localized hot spots. The single channel algorithm has been applied to extract LST from nine temporal Landsat datasets ranging from 2001 to 2013.

  5. 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.

  6. 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.

  7. Library Resource
    Articles et Livres
    décembre, 2016

    Bumble bee (Bombus) species are ecologically and economically important pollinators, and many species are in decline. In this article, we develop a mechanistic model to analyse growth trajectories of Bombus vosnesenskii colonies in relation to floral resources and land use. Queen production increased with floral resources and was higher in semi‐natural areas than on conventional farms. However, the most important parameter for queen production was the colony growth rate per flower, as opposed to the average number of available flowers.

  8. Library Resource
    Articles et Livres
    décembre, 2016
    Pologne

    The aim of the study was to determine the effects of land use management on changes in the fecal contamination of water in the Łyna River, one of the main lowland watercourses in the southern watershed of the Baltic Sea (northern Poland). A total of 120 water samples were collected in different seasons of 2011 and 2012 at 15 sites where the river intersected forest (FA), agricultural (AA), and urbanized (UA) areas.

  9. Library Resource
    Articles et Livres
    décembre, 2016
    Argentine

    We analysed coexistence patterns between two mesocarnivores, Geoffroy's cat (Leopardus geoffroyi: Felidae) and culpeo fox (Pseudalopex culpaeus: Canidae), in northern Patagonia, Argentina. We examined spatial distribution influenced by land cover, anthropogenic disturbance and invasive hare presence, and analysed temporal activity patterns and dietary composition. If competitive exclusion accounts for carnivore coexistence in this system, we predicted segregation would occur in one or more of these aspects as a mechanism for coexistence.

  10. 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.

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