Sökning: "agricultural decline"

Visar resultat 1 - 5 av 59 avhandlingar innehållade orden agricultural decline.

  1. 1. Tempo-spatial patterns of foraging by birds in mosaic agricultural landscapes

    Författare :Adriaan De Jong; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Many farmland breeding bird populations decline, while large herbivorous bird species, which forage on farmland outside the breeding period, increase their numbers. Intensification of agriculture causes both processes. LÄS MER

  3. 2. Local and landscape-level impacts of agricultural intensification on arthropod communities and their interaction networks

    Författare :Guillermo Aguilera Nuñez; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Arthropods play a central role in agricultural landscapes being responsible for the delivery of many ecosystem services such as pollination, biological pest control, and nutrient cycling. But the current global decline of arthropods is intensified by habitat modification, loss and fragmentation, pesticide use and other intensive management practices. LÄS MER

  4. 3. Growth and decline in rural Sweden : geographical distribution of employment and population 1960–2010

    Författare :Martin Hedlund; Linda Lundmark; Emma Lundholm; Olof Stjernström; Kjell Overvåg; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; rural restructuring; rural heterogeneity; manufacturing decline; agricultural decline; urbanization; rural typology; life-course perspective; cluster analysis; Sweden; Social and Economic Geography; kulturgeografi;

    Sammanfattning : This thesis investigates the combination of changes in the population and employment into sectors in rural Sweden for the period 1960-2010. The aim is to describe and analyze the demographic changes together with the labour market changes, and to account for the spatial outcome of these changes by considering the heterogeneity of rural areas. LÄS MER

  5. 4. Agroforestry systems with trees for biomass production in western Kenya

    Författare :Hans Sjögren; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Low agricultural production and a decline in fuelwood resources are serious constraints for subsistence smallholder farmers in western Kenya in the sub-Saharan African region. Furthermore, low soil fertility and general environmental degradation has contributed to the build-up of the parasitic weed Striga hermonthica. LÄS MER

  7. 5. Micronutrients in temperate forage crops grown in Sweden : species differences and effects of phenological development and soil

    Författare :Bodil Lindström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Forage crops are the most important feed for ruminants and provide energy, fibre and protein as well as essential micronutrients such as cobalt (Co), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo) and zinc (Zn). In this thesis, different aspects of the micronutrient concentrations of forage crops were investigated in temporary grasslands in Sweden. LÄS MER