Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 12.
  1. Library Resource
    Articles et Livres
    décembre, 2008
    Australie

    Water cycle, land management, and environmental sustainability are intimately linked. Sustainable land and water management practices are vital for sustaining agricultural productivity and regional development. Unsustainable land and water management practices that violate the system's carrying capacity constraint over long periods can impose significant costs in terms of lost opportunities in farm production and regional development, say by causing waterlogging and salinity.

  2. Library Resource
    Articles et Livres
    décembre, 2008
    Jordanie

    This study was carried out to evaluate the effects of deforestation on physical and chemical properties of soils under native forest in the Mediterranean region of northwestern Jordan. Land use/cover maps of 1953, 1978 and 2002 were interpreted and analysed within GIS to quantify the shift from forest to rainfed cultivation. Six sites were sampled in a non-changed forest and in cultivated fields, three for each. Different soil properties of texture, bulk density, organic matter, total nitrogen, pH, cation exchange capacity (CEC), phosphorous and potassium were analysed.

  3. Library Resource
    Articles et Livres
    décembre, 2008
    Thaïlande

    The distributed hydrology soil vegetation model (DHSVM) is applied in the 107 km² Nam Mae Rim watershed (NMRW) in northern Thailand. Simulations using land cover scenarios for 1989 and 2002, extreme deforestation, and forest, each run with and without roads, show that roads have very small effects on the mean water fluxes, but significantly increase peak flows for all land cover scenarios. The magnitude of the road effect on peak flow depends on the land cover context in which the roads are placed.

  4. Library Resource
    Articles et Livres
    décembre, 2008
    Nigéria

    The need of Fulanis for secured access to land is a long time policy challenge in Nigeria but progress in achieving this is far from being made. Meanwhile, access to land, of Fulanis that are settled among the Yorubas in southwest Nigeria, is dependent on land rights regimes operating in Yoruba communities. The study examines the nature of land rights in southwest Nigeria and how these provide access to Fulanis for their livelihoods activities. The study hypothesised that land access and land rights relate significantly to livelihood security of the Fulanis.

  5. Library Resource
    Articles et Livres
    décembre, 2008
    Pérou

    Up until the end of the 1980s the Peruvian public administration played a central role in irrigation systems throughout the country; this changed in 1989 when operational management of the systems was transferred to water users associations (WUAs). This sudden move required new management capacities for such organizations, demands that were not catered for at the time.

  6. Library Resource
    Articles et Livres
    décembre, 2008

    Developing farmers' institutional capacity to defend their water rights is central to sustaining irrigation farming in the UK. Increasing demand and competition for water and the introduction of new water regulations have led many farmers to re-evaluate the security of their water rights.

  7. Library Resource
    Articles et Livres
    décembre, 2008

    Land-use and cover changes around Budongo Forest Reserve (BFR) were analysed from multi-temporal LandSat images (1988 and 2002) and associated field-based studies in 2003-2004. Three major land-use and cover classes: forest/woodland, sugarcane plantations and grassland/shifting-cultivation/settlements were clearly discriminated. The area under sugarcane cultivation increased over 17-fold, from 690 ha in 1988 to 12729 ha in 2002, with a concomitant loss of about 4680 ha (8·2 per cent) of forest/woodland, mainly on the southern boundary of BFR.

  8. Library Resource
    Articles et Livres
    décembre, 2008
    Philippines, Afrique, Amérique centrale, Asie, Amérique du Sud

    A major development concern of the 1970s and 1980s was 'the other energy' or 'woodfuel crisis'. Woodfuel use in developing regions of Africa, Asia, and Latin America was believed to be a key factor in tropical deforestation, and the loss of forests was projected to result in widespread woodfuel shortages. In recent years, however, it has become apparent that woodfuel production is seldom a direct cause of deforestation (although it may be a by-product), and that most woodfuel demand is met by trees and shrubs growing outside of forest areas.

  9. Library Resource
    Articles et Livres
    décembre, 2008

    The prevention of soil erosion is one of the most essential requirements for sustainable agriculture in developing countries. In recent years it is widely recognized that more site-specific approaches are needed to assess variations in erosion susceptibility in order to select the most suitable land management methods for individual hillslope sections. This study quantifies the influence of different land management methods on soil erosion by modelling soil loss for individual soil-landscape units on a hillslope in Southern Uganda.

  10. Library Resource
    Articles et Livres
    décembre, 2008
    Ghana, Afrique

    To examine the impact of small reservoir irrigation development in Africa, the performance and productivity of two small reservoirs and irrigation schemes in the Upper East Region of Ghana were investigated in this study. Hydrologic data measured included daily irrigation volumes and daily evaporation. Farmer cost inputs, excluding labor, and harvest data were also recorded. There was a strong contrast in water availability between the two systems, the Tanga system having a higher amount of available water than did the Weega system.

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