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Digitale Medien

Growth and senescence in plant communities exposed to elevated CO2 concentrations on an estuarine marsh (1989)

Curtis, P. S. ; Drake, B. G. ; Leadley, P. W. ; [weitere]

Springer

Oecologia 78 (1989), S. 20-26

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ISSN: 1432-1939

Schlagwort(e): Elevated CO2 ; Productivity ; Salt marsh ; Scirpus olneyi ; Spartina patens

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Three high marsh communities on the Chesapeake Bay were exposed to a doubling in ambient CO2 concentration for one growing season. Open-top chambers were used to raise CO2 concentrations ca. 340 ppm above ambient over monospecific communities of Scirpus olneyi (C3) and Spartina patens (C4), and a mixed community of S. olneyi, S. patens, and Distichlis spicata (C4). Plant growth and senescence were monitored by serial, nondestructive censuses. Elevated CO2 resulted in increased shoot densities and delayed sensecence in the C3 species. This resulted in an increase in primary productivity in S. olneyi growing in both the pure and mixed communities. There was no effect of CO2 on growth in the C4 species. These results demonstrate that elevated atmospheric CO2 can cause increased aboveground production in a mature, unmanaged ecosystem.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00377193

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Digitale Medien

Interactions between C3 and C4 salt marsh plant species during four years of exposure to elevated atmospheric CO2 (1993)

Arp, W. J. ; Drake, B. G. ; Pockman, W. T. ; [weitere]

Springer

Plant ecology 104-105 (1993), S. 133-143

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ISSN: 1573-5052

Schlagwort(e): Growth ; Water relations ; Competition ; Distribution

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Elevated atmospheric CO2 is known to stimulate photosynthesis and growth of plants with the C3 pathway but less of plants with the C4 pathway. An increase in the CO2 concentration can therefore be expected to change the competitive interactions between C3 and C4 species. The effect of long term exposure to elevated CO2 (ambient CO2 concentration +340 µmol CO2 mol-1) on a salt marsh vegetation with both C3 and C4 species was investigated. Elevated CO2 increased the biomass of the C3 sedgeScirpus olneyi growing in a pure stand, while the biomass of the C4 grassSpartina patens in a monospecific community was not affected. In the mixed C3/C4 community the C3 sedge showed a very large relative increase in biomass in elevated CO2 while the biomass of the C4 species declined. The C4 grassSpartina patens dominated the higher areas of the salt marsh, while the C3 sedgeScirpus olneyi was most abundant at the lower elevations, and the mixed community occupied intermediate elevations.Scirpus growth may have been restricted by drought and salt stress at the higher elevations, whileSpartina growth at the lower elevations may be affected by the higher frequency of flooding. Elevated CO2 may affect the species distribution in the salt marsh if it allowsScirpus to grow at higher elevations where it in turn may affect the growth ofSpartina.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00048149

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