Sökning: "semi-arid"

Visar resultat 21 - 25 av 44 avhandlingar innehållade ordet semi-arid.

1. 21. Unsaturated Solute Transport in a Semiarid Catchment - Nonlinear Analyses and Modelling

   Författare :Pernilla Öhrström; Avdelningen för Teknisk vattenresurslära; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; teknisk geografi; Hydrogeologi; teknisk geologi; unsaturated zone; Hydrogeology; geographical and geological engineering; solute transport; scaling; soils; semiarid regions; heterogeneity; preferential flow; fractals;

   Sammanfattning : Unsaturated solute transport is highly variable and therefore difficult to predict. In semi-arid areas, where water resources are limited, the presence of macropores is of great importance for crop production. The bromide ion (Br-) and dye tracers are useful for studies of water movement. LÄS MER

3. 22. Stem canker and dieback disease on Grevillea robusta Cunn ex R. Br : distribution, causes and implications systems in agroforestry systems in Kenya

   Författare :Jane Wangu Njuguna; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Sammanfattning : A widespread stem canker and dieback disease threatened the cultivation of Grevillea robusta on farms in Kenya. Disease index increased from 18% in the humid zone to 67% in the semi-arid zones and strongly correlated with altitude and length of drought period in the zones. LÄS MER

4. 23. Food and Fashion : Water Management and Collective Action among Irrigation Farmers and Textile Industrialists in South India

   Författare :Anna Blomqvist (Jonsson); Jan Lundqvist; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Water in nature and society; Vatten i natur och samhälle;

   Sammanfattning : In recent years, much ofthe political debate in the West, East aud South has focused on the decentralization of responsibilities from the state to private enterprises and NGOs. But what potential is there for local communities to create their own govenlance structures able to deal with issues up till recently seen as the responsibility of the state? In this thesis, answer to this question is sought by analyzing two case studies from the semi-arid Coimbatore-region in South India from an institutionai perspective. LÄS MER

5. 24. A QUEST FOR ENVIRONMENTAL SOVEREIGNTY : Chicana/o Literary Experiences of Water (Mis)Management and Environmental Degradation in the US Southwest

   Författare :María Isabel Perez-Ramos; Sverker Sörlin; Marco Armiero; Joni Adamson; Maria Herrera Sobek; KTH; []
   Nyckelord :HUMANIORA; HUMANITIES; Environmental humanities; ecocriticism; environmental history; comparative literature; U.S. Southwest; Chicana o; subaltern literature; environmental justice; water; political ecology; postcoloniality; decoloniality.; Miljöhumaniora; ekokritik; miljöhistoria; litteraturhistoria; sydvästra USA; Chicana o; subaltern litteratur; miljörättvisa; vatten; politisk ekologi; postkolonialitet; dekolonialitet.; Historiska studier av teknik; vetenskap och miljö; History of Science; Technology and Environment;

   Sammanfattning : The U.S. Southwest is a semi-arid region affected by numerous environmental problems. Chicana/o communities have been directly affected by such problems, especially ever since the region was annexed from Mexico by the United States in the mid-nineteenth century. LÄS MER

7. 25. Drainage intensity in paddy rice fields : nitrogen flows, salinity, rice yield and greenhouse gas emissions

   Författare :Olive Tuyishime; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Sammanfattning : Managing drainage intensity is important in controlling soil moisture and nutrient losses and improving crop yields. This thesis evaluated the effects of drainage intensity on nitrogen losses, salinity and rice grain yield in three cropping seasons, and on gaseous emissions of methane (CH4) and nitrous oxide (N2O) from rice flowering to ripening in one season, on a marshland in semiarid region of Rwanda. LÄS MER