Response of a tundra ecosystem to elevated atmospheric carbon dioxide and CO(sub 2)-induced climate change. Post-field season work plan, September 1, 1994--November 30, 1994

摘要

The preliminary data from the temperature and water table manipulations indicated that net CO(sub 2) flux of both tussock and wet sedge tundra ecosystems is sensitive to changes in water table depth and soil temperature. The preliminary results from the patch, landscape, and regional flux measurements indicate that there are large deficiencies in our current ability to extrapolate from patch and landscape levels to the region. During fall 1994, our primary goals are to: (1) Analyze a full season of net CO(sub 2) flux from the in situ manipulations, and determine the effects of water table depth and elevated temperature on the C balance of arctic ecosystems. Once this task is complete, the data will be published in a form that discusses the importance of these environmental controls, and their relevance to future CO(sub 2)-induced climate change. (2) Analyze tower- and aircraft-based eddy correlation flux data, and develop methods to reduce the time required to analyze these data. (3) Determine the importance of environmental controls of the exchange of CO(sub 2) at each spatial scale, and to develop the necessary routines that will permit the scaling of fine-scale flux data to landscape and regional scales. (4) Prepare manuscripts for publication on net CO(sub 2) flux data for each spatial scale, latitudinal flux pattern, and on methods and considerations for scaling from point measurements to the landscape and regional scale.