Effects of elevated CO/sub 2/ on canopy gas exchange in a Chesapeake Bay salt marsh. [Spartina patens; Scirpus olneyi; Distichlis spicata]
The response of wild species in their native habitat to elevated CO/sub 2/ is poorly understood. The authors have developed a system to elevate and monitor CO/sub 2/ in three communities of a brackish high marsh: a Spartina patens (C4) community, a Scirpus olneyi (C3) community, and a mixed community of S. patens, S. olneyi, and Distichlis spicata (C4). CO/sub 2/ concentrations 260 ppm above ambient were maintained in 0.4 m3 open top chambers which were sealed for measurement of net CO/sub 2/ exchange (NCE). Continuous sampling of inlet and exhaust air allowed determination of NCE as a function of incident light and calculation of integrated 24 hr carbon balance. Seasonal trends and elevated CO/sub 2/ effects on canopy respiration, quantum yield, light compensation point, and maximum NCE will be discussed.
- Research Organization:
- Environmental Research Center, Edgewater, MD
- OSTI ID:
- 5600913
- Report Number(s):
- CONF-8707108-
- Journal Information:
- Plant Physiol., Suppl.; (United States), Journal Name: Plant Physiol., Suppl.; (United States) Vol. 83:4; ISSN PPYSA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Long term effects of elevated CO sub 2 on photosynthesis and dark respiration of C3 and C4 salt marsh species in the field. [Scirpus olneyi; Spartina patens]
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Related Subjects
560300* -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AQUATIC ECOSYSTEMS
ATMOSPHERES
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHRONIC EXPOSURE
CONTROLLED ATMOSPHERES
ECOSYSTEMS
EXPOSURE CHAMBERS
GRASS
MARSHES
OXIDES
OXYGEN COMPOUNDS
PLANTS
RESPIRATION
SPECTRA
VISIBLE SPECTRA
WETLANDS