Sökning: "land degradation"

Visar resultat 1 - 5 av 110 avhandlingar innehållade orden land degradation.

  1. 1. Does land degradation matter? : perspectives on environmental change in north-eastern Botswana

    Författare :Peter Kinlund; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

    Sammanfattning : .... LÄS MER

  3. 2. Land Degradation and Climate in Iceland - a spatial and temporal assessment

    Författare :Rannveig Olafsdottir; Institutionen för naturgeografi och ekosystemvetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; spatial analysis; long-term analysis; Holocene; spatial simulations; Iceland; Geology; fysisk geografi; physical geography; Geologi; land cover; farmers perception; Land degradation;

    Sammanfattning : Degradation of vegetation and soil erosion has contributed to loss of biological productivity and land degradation in Iceland. This thesis focuses on spatial and temporal patterns of land degradation in Iceland from a geographical perspective both along short and long timescales. LÄS MER

  4. 3. Recent changes in land use and productivity in agro-pastoral Inner Mongolia, China

    Författare :Sara Brogaard; LUCSUS; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; geomorphology; Physical geography; China; Inner Mongolia; remote sensing; LUE model; primary production; GPP; yield variability; land degradation; farmers’ perception; productivity; Land use; pedology; cartography; climatology; Fysisk geografi; geomorfologi; marklära; kartografi; klimatologi;

    Sammanfattning : This study challenges the prevailing assumption that the expansion of cultivated land areas and increasing number of livestock in the agro-pastoral regions of northern China have aggravated the process of land degradation since the start of the rural reforms in 1978. Land-use and productivity trends in the Inner Mongolia Autonomous Region (IMAR), with special attention to the Keerqin steppe region, have been analysed. LÄS MER

  5. 4. Ecological rehabilitation of degraded hill slopes in southern Wello, Ethiopia

    Författare :Kebrom Tekle; Ingvar Backéus; Eddy van der Maarel; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Classification; hillside closures; intercept lengths; land cover; land degradation; local participation; natural regeneration; ordination; permanent plots; soil seed banks; succession; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; Ecological Botany; Ekologisk botanik;

    Sammanfattning : Clearing of vegetation has left large areas of southern Wello (Ethiopia) at a high risk ofland degradation. In this study, the causes, extent and consequences of land degradationproblems are reviewed. To see land cover changes, aerial photographs from 1958 and1986 were compared with the help of a GIS procedure. LÄS MER

  7. 5. Risk, Time and Land Management under Market Imperfections: Applications to Ethiopia

    Författare :Mahmud Yesuf; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; land degradation; market imperfections; transaction costs; soil conservation; fertilizer adoption; risk preference; time preference; experimental studies; Ethiopia;

    Sammanfattning : This Ph.D. thesis addresses both theoretical and empirical issues pertaining to land management decisions of farm households in developing countries working under an imperfect market and institutional setting (with case studies from Ethiopia). LÄS MER