Sökning: "tundra vegetation"
Visar resultat 16 - 20 av 33 avhandlingar innehållade orden tundra vegetation.
16. Mechanisms of below-ground carbon cycling in subarctic ecosystems
Sammanfattning : Some components of the below-ground carbon (C) cycle in terrestrial ecosystems are still poorly understood. A better understanding will be necessary to predict adequately the impacts of global change factors on C cycling and storage, especially in high-latitude ecosystems, where much of the C is stored below-ground. LÄS MER
17. Temporal and spatial variability of carbon cycling in a subarctic landscape
Sammanfattning : This thesis deals with the carbon balance in a subarctic landscape at different temporal and spatial scales. Its focus is mainly on the peatland and mountain birch forest (Betula pubescens ssp. czerepanovii) ecosystems within the Abisko area in northernmost Sweden. This is an area with a temperature close to the 0 OC mean annual isotherm. LÄS MER
18. Nitrogen and phosphorus dynamics across an elevational gradient in a Swedish subarctic tundra
Sammanfattning : Rising temperatures associated with global climate change are likely to drive major shifts in plant and soil properties as well as plant-soil linkages that govern key ecosystem processes in subarctic tundra. However, the tundra landscape is not homogenous, but instead consists of a mosaic of vegetation types which differ greatly in vegetation characteristics and soil fertility. LÄS MER
19. The role of herbivores in mediating responses of tundra ecosystems to climate change
Sammanfattning : The Arctic areas are warming more rapidly than other parts of the world. Increasing temperatures are predicted to result in shrubification, higher productivity, declining species diversity and new species invasions to the tundra. LÄS MER
20. On the role of terrestrial ecosystems in a changing Arctic
Sammanfattning : The global temperature rise is proportional to the cumulative amount of CO2 emissions to the atmosphere. This observation is consistent between climate models and historical observations. LÄS MER