Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 17.
  1. Library Resource
    Articles et Livres
    décembre, 2015

    Within the investigated river basins the deforestation ranged from 0-45.5%, dependent on the amount of windstorm damage. Our water temperature readings revealed that the canopy elimination above the streams in the areas damaged by the windstorm caused increase in daily and annual water temperature and also wider daily water temperature range, than those in the undisturbed reference stream, which caused the decline of cold stenotherm species abundance. The stream basins deforestation was collinear with FPOM and UFPOM concentrations, water temperature gradient and nitrate concentrations.

  2. Library Resource
    Articles et Livres
    décembre, 2014

    Land cover change (LCC) is important to assess the land use/land cover changes with respect to the development activities like irrigation. The region selected for the study is Vaal Harts Irrigation Scheme (VHS) occupying an area of approximately 36, 325 hectares of irrigated land. The study was carried out using Land sat data of 1991, 2001, 2005 covering the area to assess the changes in land use/land cover for which supervised classification technique has been applied.

  3. Library Resource
    Articles et Livres
    décembre, 2009
    Indonésie

    Soil erosion by water is considered as one of the most significant forms of land degradation that affects sustained productivity of agricultural land use and water quality. It is influenced by a considerable number of factors (including climate, soil, topography, land use and types of land management), so that the information on the spatial distribution of soil erosion rate and its related effects can be effectively employed as a baseline data for land use development and water protection.

  4. Library Resource
    Articles et Livres
    décembre, 2007

    In this paper we investigate the potential production and implications of a global biofuels industry. We develop alternative approaches to consistently introduce land as an economic factor input and in physical terms into a computable general equilibrium framework. The approach allows us to parameterize biomass production consistent with agro-engineering information on yields and a "second generation" cellulosic biomass conversion technology.

  5. Library Resource
    Articles et Livres
    décembre, 2009
    Croatie

    The purpose of this study was to find out whether a set of habitat characteristics, derived from the National Corine Land Cover (CLC) database of habitat types, could indicate the occurrence of white stork nests in a settlement. The analyses were performed for the settlements closer than 35 km from the Drava River (northern Croatia). Sixteen habitat characteristics were determined around 257 settlements occupied with white stork nests and 152 control sites without white stork nests within the same geographic region.

  6. Library Resource
    Articles et Livres
    décembre, 2009
    Iran

    Soil erosion and contamination are two main desertification indices or land degradation agents in agricultural areas. Global climate change consequence is a priority to predict global environmental change impacts on these degradation risks. This agro-ecological approach can be especially useful when formulating soil specific agricultural practices based on the spatial variability of soils and related resources to reverse environmental degradation.

  7. Library Resource
    Articles et Livres
    décembre, 2009

    In a river, the flow directly affects the physical and chemical properties of its water, with further consequences for aquatic biota. Land use practices and vegetation cover play a significant role in the water cycle. The wide-spread perception of forest cover, in terms of hydrology is that forests may reduce water runoff: although in rare instances the contrary has been reported. Water runoff varies seasonally and depends on the forest tree species. By no means can it be considered constant over large expanses of area or for various rainfall patterns.

  8. Library Resource
    Articles et Livres
    décembre, 2004

    This paper argues that current forms of agricultural biotechnology have significant potential for developing countries; the challenge is to realize this potential. We develop a conceptual model that explains why the yield effects of GMVs (genetically modified varieties) tend to be significant and reduce chemical use, contributing to human welfare, and present results from empirical studies that support these findings. We demonstrate that the adoption of GMVs might not necessarily lead to elimination of many varieties. Instead, crop biodiversity may be enhanced.

  9. Library Resource
    Articles et Livres
    décembre, 2004

    Game theory and numerical simulation analyze the host government's role in strategically regulating intellectual property rights (IPRs) for agricultural biotechnology in a developing country. A foreign monopolist imports and sells a genetically modified crop variety that will offer the host country both selective productivity gains and a negative externality. In this small open economy, only some heterogeneous producers adopt the new variety. Public policy consists of IPR enforcement and a corrective tax.

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