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Title: Carbon and water fluxes in a boreal forest ecosystem
Author: Rayment, Mark Bryce
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1998
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To obtain a better understanding of the functioning of a globally important biome, the BOREAS project set out to make measurements of the interaction between a number of boreal ecosystems and the atmosphere. This study is concerned with measurements made in one such ecosystem, the old-growth black spruce (OBS) site of the BOREAS Southern study area (SSA), located in Saskatchewan, Canada, during the period 1993-1996. This thesis focuses on efforts to understand the net ecosystem exchange of CO2 and water vapour in terms of the sub-component fluxes operating within the ecosystem. The component fluxes of primary interest are photosynthesis, respiration and evapotranspiration of foliage, and the efflux of CO2 from the forest floor. Woody biomass respiration and changes in the storage of CO2 in the air mass within the ecosystem are also considered. Methodologies were developed to study these fluxes on a continuous basis. An "open" system gas exchange chamber for measuring soil CO2 efflux was designed that eliminated the major problems that have been associated with this methodology in the past. The system was used to investigate temporal and spatial variation in soil CO2 efflux at the field site. A scheme that integrated this temporal and spatial variation was used to estimate the CO2 efflux from the forest floor for an entire year. Spatial variability in soil CO2 efflux was high, and was related empirically to the thickness of the dead moss layer. Hour to hour variation was well described as an exponential function of soil temperature, and was significantly related to atmospheric turbulence.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available