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Resultados de la búsqueda

Mostrando ítems 1 a 9 de 34.
  1. Library Resource
    Artículos de revistas y libros
    Junio, 2019
    Tanzania

    The growing number of farmer-herder resource conflicts in Tanzania is often presented in official narratives as a product of climate change resulting from increased environmental pressures. Nonetheless, based on a qualitative research, this paper asserts that farmer- herder conflicts in Rufiji and Kisarawe districts should be understood in terms of the marginalization of pastoral community interests over access to land. This has created what Hall, Hirsch and Li [2013. Power of Exclusions: Lland Dilemmas in Southeast Asia.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011
    China

    Grassland degradation not only results in soil degradation and severe decreases in land productivity, but also can promote the emission of soil carbon and nitrogen compounds as greenhouse gases into the atmosphere. The primary objective of this study was to characterize the impact of grassland degradation on carbon and nitrogen budgets in Inner Mongolia, China. We investigated the changes of total carbon, organic carbon, inorganic carbon and total nitrogen that occur in a grassland ecosystem (including vegetation and top 30 cm soil layer) in the course of grassland degradation.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 2015

    Grassland ecological migration project is implemented in Northwest China as an attempt to restore the deteriorative ecosystems. People are relocated from uninhabitable areas to immigrant areas, resulting in land use changes, which would significantly impact the ecological environment. Therefore, it urgently needs quantitative evaluation and analysis of the trends of ecological change in these immigrant areas. We selected Luanjingtan, which is the largest ecological immigrant area in Alxa, Inner Mongolia, as our case.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011
    Nueva Zelandia

    Concerns about climate change and water quality make it necessary to have a better understanding of the cycling of carbon (C) and nitrogen (N) within landscapes. In New Zealand, pastoral farming on hill country is a major land use, and there is little information available at a landscape level on the cycling of C and N within these systems, particularly the impacts of land use intensification.

  5. Library Resource
    Artículos de revistas y libros
    Diciembre, 2013
    Australia

    The time-integrated normalized difference vegetation index (iNDVI) provides key remote-sensing-derived information on the interactions between vegetation growth, climatic and soil conditions, and land use. Using a time-series of Landsat imagery obtained for Queensland, Australia, it has been demonstrated how robust geostatistics can be used to predict iNDVI. This approach is novel because it explicitly quantifies the uncertainty of prediction and uses Winsorizing, a data-censoring method, to minimize the distorting effects of outliers.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 2013
    Níger, África occidental

    Recent studies using low-resolution satellite time series show that the Sahelian belt of West Africa is witnessing an increase in vegetation cover/biomass, called re-greening. However, detailed information on local processing and changes is rare or lacking. A multi-temporal set of Landsat images was used to produce land-cover maps for the years 2000 and 2007 in a semi-arid region of Niger, where an anomalous vegetation trend was previously detected.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 2013
    Etiopía

    In the semi-arid tropics, communal grazing lands provide a livelihood for millions of people. However, it is highly threatened by overgrazing and continuous land degradation and, as a result, proper management is important to improve the livelihood of the people. This study investigated the effectiveness of exclosures established on communal grazing lands to restore soil properties and identified the relationship among soil properties, site and vegetation characteristics, and exclosure age.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 2013
    Estados Unidos de América

    The effects of land management and disturbance on ecosystem performance (i.e. biomass production) are often confounded by those of weather and site potential. The current study overcomes this issue by calculating the difference between actual and expected ecosystem performance (EEP) to generate ecosystem performance anomalies (EPA). This study aims to delineate and quantify average EPA from 2000–2009 within the Greater Platte and Upper Colorado River Basins, USA.

  9. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011
    Irán

    This study was aimed at assessing the causes of the gully erosion and its effects on the agricultural lands in the arid region of southeastern Iran. In this study, we have used geologic maps in scales of 1:50,000 and 1:250,000, aerial photographs on a scale of 1:20,000, field observation, and GPS (global positioning system).

  10. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014
    Sudáfrica, África austral

    We examined the effect of changes in land use and land tenure on bush encroachment and vegetation condition. An analysis of aerial photographs from three time steps (1949, 1985 and 2004) was used to document changes in woody plant density in different vegetation types on commonage and an adjacent commercial farm in Fort Beaufort, South Africa. Rangeland condition was assessed in different vegetation units of the area and woody plant density was related to distance from urban settlement.

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