Sökning: "spatial trends"

Visar resultat 11 - 15 av 104 avhandlingar innehållade orden spatial trends.

1. 11. Spatial Strategies for Biodiversity Conservation

   Författare :André Pinto da Silva; Mats Bjõrklund; Greta Bocedi; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; global change; Southern Asia; mammals; ecological modelling; Biology with specialization in Animal Conservation; Biologi med inriktning mot zoologisk bevarandebiologi;

   Sammanfattning : Biodiversity is being lost under alarming rates due to an unsustainable socio-economic trajectory causing global change. Such loss is unequally spread over the Earth, and Southern Asia has been and is projected to continue to be one of the most affected regions. LÄS MER

3. 12. Modelling Freshwater-Seawater Interactions in Coastal Aquifers : Long-term Trends and Temporal Variability Effects

   Författare :Carmen Prieto; KTH; []
   Nyckelord :seawater intrusion; seasonal variability; artificial recharge; spatial and temporal randomness;

   Sammanfattning : Over-exploitation of coastal aquifers causes seawaterintrusion and eventually contamination of groundwater wells inmany parts of the world. Desalination of brackish water andartificial recharge of treated wastewater may then be asustainable strategy for managing groundwater supply inwater-stressed regions. LÄS MER

4. 13. Ecology of lichens in boreal coniferous forests with reference to spatial and temporal patterns

   Författare :Per-Anders Esseen; Lars Ericson; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lichens; epiphytes; Alectoria; Bryoria; Cladonia; Usnea; Picea abies; Pinus sylvestris; dispersal; litterfall; succession; diversity; spatial patterns;

   Sammanfattning : The thesis deals with the ecology of lichens in two contrasting types of forest, epiphytic lichens in old Picea abies forest of the fi re-refugia type and epigeic as well as epixylic lichens in a successional sequence of fire- susceptible Pinus sylvestris forests. Results in five separate papers form the basis for a discussion of general patterns of dispersal, succession and life strategies in lichens. LÄS MER

5. 14. Changing population distribution in Sweden : long term trends and contemporary tendencies

   Författare :Johan Håkansson; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Population distribution; redistribution; Sweden; geographical levels; concentration; dispersion; accessibility; migration; natural population change; age composition;

   Sammanfattning : The aim of the thesis is to describe and analyse the population redistribution in Sweden at different geographical levels from the beginning of the 19th century to the end of the 20th century. The analysis is approached in three different ways. First, the redistribution at different geographical levels is analysed (papers I and II). LÄS MER

7. 15. Material metabolism of residential buildings in Sweden: Material intensity database, stocks and flows, and spatial analysis

   Författare :Paul Gontia; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HUMANIORA; HUMANITIES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; clustering algorithms; single-family buildings; bottom-up modeling; residential buildings; human settlements; spatial analysis; multi-family buildings; material flow accounting; construction materials; material intensity database; material stock; urban stock; built environment; anthropogenic metabolism;

   Sammanfattning : Construction materials are used for the expansion and maintenance of the built environment. In the last century, construction material stock has increased globally 23-fold. LÄS MER