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Mostrando ítems 1 a 9 de 6.
  1. Library Resource
    Documentos de conferencias e informes
    Diciembre, 2017
    Letonia

    Soil samples in 349  sampling plots were obtained within the LUCAS project in 2009; from these, 205 soil samples were collected in agricultural lands (grasslands, arable lands, grasslands overgrown by trees and shrubs), and 133 soil samples were obtained in forests (deciduous, coniferous and mixed forests), as well as 7 soil samples–in scrublands.

  2. Library Resource
    Documentos de conferencias e informes
    Diciembre, 2005
    Letonia

    Investigations of grasslands in Latvia started at the beginning of the 20ty century. One of the main goals was investigation of vegetation classification. In Latvia typology of natural grasslands in several investigation periods is based on different criterions: (1) economic typology, (2) grasslands vegetation physionomic classification according to dominant method, (3) classification of flora according to Braun-Blanquet method.

  3. Library Resource
    Documentos de política y resúmenes
    Diciembre, 2008
    Letonia

    The Promotional Paper Forest Land Transformation in Latvia by Gunta Bāra has been developed at the Forest Faculty of the Latvian University of Agriculture between 2001 and 2007. Goal of the Promotional Paper: to identify the main problems in transformation of forest land in the Republic of Latvia and gaps in legislative instruments regulating the process of change of land use type, to prepare recommendations for their elimination, to develop a methodology for calculation of compensation for the losses caused to the state as a result of destruction of natural forest environment.

  4. Library Resource
    Documentos de política y resúmenes
    Diciembre, 2011
    Letonia, Noruega

    Changes in soil morphological, physical and chemical properties as a result of establishing forest on agricultural lands were studied using as an example the lands naturally overgrowing in different periods of time by Norway spruce (Picea abies (L.) H. Karst.), silver birch (Betula pendula Roth.), grey alder (Alnus incana (L.) Moench) and aspen (Populus tremula L.). The research results showed that the soil with a texture of sandy loam and loam retains the morphological properties of agricultural land for up to 100 years.

  5. Library Resource
    Documentos de política y resúmenes
    Diciembre, 2014
    Letonia

    Study was conducted in north-eastern Latvia (57° 38’ N, 22° 17’ E): in a part of Slitere National Park that was un-managed since year 1923 and affected by large storm in November of 1969. Supervised classification of Corona and Landsat 5 images of the area (in total 1646 ha) from years before and after the storm (1966–2010) were carried out and parameters characterizing the fragmentation calculated for 3 land-cover classes: forest, areas with low woody biomass and non-forest areas.

  6. Library Resource
    Documentos de política y resúmenes
    Diciembre, 2010
    Letonia

    The aim of this paper is to analyze the structure of forest landscape and its impact on biodiversity in the Bauska District, Latvia. The database of the State Forest Service and field research from 1994 to 2004 were used. Diversity and protection of the current forest ecosystems were described using different forest classification methods. The structure of tree species and their age was analyzed. Analysis indicated a decrease of oak forests by 3.5% of their native vegetation area and a high proportion of drained forests, as well as a disproportional age structure of forest ecosystems.

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