Responses of the C[sub 4] grass Schizachyrium and grassland invader Prosopis over glacial to present CO[sub 2] concentrations
- USDA-ARS, Temple, TX (United States)
The woody C[sub 3] Prosopis glandulosa and perennial C[sub 4] grass Schizachyrium scoparium were grown along a daytime gradient from 340 to 200 [mu]mol/mol CO[sub 2] to determine effects of the increase in atmospheric [CO[sub 2]] since glaciation on growth, resource use, and competitive interactions of a species from C[sub 4]-dominated grasslands in the US and the invasive legume P. glandulosa. Increasing [CO[sub 2]] stimulated N[sub 2]-fixation and elicited comparable relative increases in leaf photo- synthesis and water use efficiency in the shrub. Production and nitrogen use efficiency increased linearly with [CO[sub 2]] in P. glandulosa plants that were grown alone, but the CO[sub 2] effect was negated in plants grown with S. scoparium. There was no effect of [CO[sub 2]] on production or water use efficiency of the C[sub 4] grass. Rising [CO[sub 2]] may have contributed to the historical proliferation of P. glandulosa on C[sub 4] grasslands where the woody seedlings can rapidly escape competition with grasses.
- OSTI ID:
- 6201846
- Report Number(s):
- CONF-930798--
- Journal Information:
- Bulletin of the Ecological Society of America; (United States), Journal Name: Bulletin of the Ecological Society of America; (United States) Vol. 74:2; ISSN BECLAG; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AVAILABILITY
BIOLOGICAL EFFECTS
C4 SPECIES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
ECOSYSTEMS
GRAMINEAE
GROWTH
LILIOPSIDA
MAGNOLIOPHYTA
NUTRIENTS
OXIDES
OXYGEN COMPOUNDS
PLANT GROWTH
PLANTS
POPULATION DYNAMICS
RANGELANDS
TERRESTRIAL ECOSYSTEMS