In situ carbon dioxide flux from Arctic tundra during freeze- up

dc.contributor.authorKessler, Tyree Woodrowen
dc.description.abstractThe relationship between soil temperature and CO₂ flux from undisturbed soil cores was examined during freeze-up of arctic tundra. Three habitats which dominate tundra topography, polygon trough, ridge and basin, produced significantly different amounts of CO₂ when soil temperatures were above 0 C. A significant positive correlation between soil temperatures between 10 to -7 C and CO₂ flux from each habitat was established. Substantial quantities of CO₂ were produced during freeze-up period when soil temperatures remained near 0 C for an extended period, and the CO₂ production continued at reduced levels as the soil temperature dropped below 0 C. When soil temperatures reached -7 C and the study was terminated, the CO₂ flux was reduced to a low level, but did not reach extinction. A maximum CO₂ flux of 2925 mg CO₂/m²/day from the trough habitat was observed when the soil temperature was 10 C, and the minimum CO₂ flux of 131 mg/m²/day was observed when the soil temperature was -7 C. These data are consistant with the hypothesis that soil microorganisms in arctic tundra are capable of physiological activity in the range of 0 to -7 C.en
dc.description.degreeMaster of Scienceen
dc.format.extent34 leavesen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 21387117en
dc.rightsIn Copyrighten
dc.subject.lccLD5655.V855 1977.K488en
dc.subject.lcshTundra ecologyen
dc.subject.lcshCarbon dioxideen
dc.subject.lcshFreezing precipitationen
dc.titleIn situ carbon dioxide flux from Arctic tundra during freeze- upen
dc.type.dcmitypeTexten Polytechnic Institute and State Universityen of Scienceen
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