Effects of experimentally-warmed tundra on diurnal gas exchange in Salix-, Carex, and Eriophorum in a high-arctic lowland oasis
- Univ. of Alberta, Edmonton (Canada)
- Univ. of British Columbia, Vancouver, BC (Canada)
Gas exchange was measured for the willow Salix arctica and two sede species. Carex qauatilus stans and Eriophorum angustifolium triste, at Alexandra Fiord, Ellesmere Island (78[degrees]52'N) in an experiment designed to stimulate climate change. The tundra was warmed using passive, open-topped experimental chambers that raised daily mean temperatures approx. 2[degrees] over two seasons. The chambers are part of the International Tundra Experiment (ITEX), the objective of which is to assess potential impacts of global warming on tundra plant communities. Salix arctica was measured in dry tundra and on adjacent wet meadow hummocks. The sedges were measured on hummocks and in hollows in the wet meadow only. Gas exchange was measured every four hours for 48 hours for each species. For S arctica, experimental warming had no effect in the dry tundra, but appeared to depress net assimilation (NA) in the wet meadow. Gas exchange parameters were slightly higher overall in the dry tundra for this species. For the sedges, the warming treatment had no major effect, although it caused some reduction of NA for Eriophorum on the hummocks. Gas exchange parameters were generally higher for Carex than for Eriophorum. No regular diurnal patterns of gas exchange were observed for any species.
- OSTI ID:
- 7272069
- Report Number(s):
- CONF-940894-; CODEN: BECLAG
- Journal Information:
- Bulletin of the Ecological Society of America; (United States), Vol. 75:2; Conference: Annual Ecological Society of America (ESA) meeting: science and public policy, Knoxville, TN (United States), 7-11 Aug 1994; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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