Search for dissertations about: "soil fertility"

Showing result 11 - 15 of 45 swedish dissertations containing the words soil fertility.

  2. 11. Comparing effects of endogenous and anthropogenic nitrogen supply on ectomycorrhizal fungi

    Author : Karolina Jörgensen; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Boreal forests are characterized by strong nutrient limitation and nitrogen is partic-ularly scarce. Ectomycorrhizal fungi acquire nitrogen from the soil in return for car-bon from their tree host and are, thus, pivotal mediators of carbon and nitrogen cy-cling. READ MORE

  4. 12. Water harvesting for resilience building in the Sahel : on-farm supplemental irrigation and soil fertility management for dry spell mitigation of sorghum

    Author : Patrick Fox; Stockholms universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; water harvesting; rained farming; soil water content; burkina faso; Bevattning; Afrika; Sahel;

    Abstract : .... READ MORE

  5. 13. The village that vanished : The roots of erosion in a Tanzanian village

    Author : Vesa-Matti Loiske; Ulf Sporrong; Aud Talle; Stockholms universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; soil erosion; soil conservation; Tanzania; Iraqw; social stratification; land tenure; Mama Issara; Giting; Hanang; Political Ecology; Scientific realism; Geography; villagization; Human geography; Kulturgeografi; Human Geography; kulturgeografi;

    Abstract : In the village'of Citing in the northern highlands of Tanzania, the factors: social stratification, land tenure, production strategies, investment patterns and the economic uncertainties of society are studied and their relationship to land degradation is examined. The main assumption of the study is that the causes of land degradation are so complex that a methodology that emphasises contextualisation has to be used. READ MORE

  6. 14. The role of regeneration in plant niche differentiation and habitat specialization

    Author : Dirk-Jan ten Brink; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; seed mass; seed size; drought; shade; seed germination; seed dormancy; seedling establishment; plant community ecology; assembly rules; habitat specialization; plant recruitment; Regeneration; niche differentiation; phylogenetic independent contrasts; plant traits; soil fertility; comparative ecology;

    Abstract : To predict the effects of environmental change and nature management on the distribution of plant species, it is crucial to understand the mechanisms of plant niche differentiation and habitat specialization. The importance to habitat specialization of particular plant traits and requirement of the regenerative phase of the plants life has received scanty interest. READ MORE

  7. 15. Making the Most of It? : Understanding the social and productive dynamics of small farmers in semi-arid Iringa, Tanzania

    Author : Peter Gregersen; Sociologi; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Social changes; Malthus; Boserup; Tanzania; semi-arid Africa; Iringa; conservation; sustainability; soil fertility; degradation; population; Matthew principle; social differentiation; farmerisation; de-peasantisation; livelihood diversification; rural change; agrarian change; agricultural change; small farmers; dynamics; theory of social work; Sociala förändringar; teorier om socialt arbete; Malthus; Boserup; Tanzania;

    Abstract : While much of semi-arid Africa is still sparsely populated with unused land, there are everywhere pockets of high and increasing population density in attractive locations. Small-scale farmers can respond to beginning land-scarcity in a number of ways. READ MORE