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Titolo:
Effects of elevated CO2 on the response of Phleum pratense and Poa pratensis to aboveground defoliation and root-feeding nematodes
Autore:
Wilsey, BJ;
Indirizzi:
McGill Univ, Dept Biol, Montreal, PQ H3A 1B1, Canada McGill Univ MontrealPQ Canada H3A 1B1 Biol, Montreal, PQ H3A 1B1, Canada
Titolo Testata:
INTERNATIONAL JOURNAL OF PLANT SCIENCES
fascicolo: 6, volume: 162, anno: 2001,
pagine: 1275 - 1282
SICI:
1058-5893(200111)162:6<1275:EOECOT>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
YELLOWSTONE-NATIONAL-PARK; TALLGRASS PRAIRIE ECOSYSTEM; ATMOSPHERIC CARBON-DIOXIDE; LONG-TERM EXPOSURE; PLANT-RESPONSES; SPOROBOLUS-KENTROPHYLLUS; NUTRIENT ACQUISITION; BOUTELOUA-GRACILIS; BIOMASS PRODUCTION; TRIFOLIUM-REPENS;
Keywords:
defoliation; elevated CO2; herbivory; grassland; nematodes; Phleum; Poa;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Wilsey, BJ Iowa State Univ, Dept Bot, 353 Bessey Hall, Ames, IA 50011 USA Iowa State Univ 353 Bessey Hall Ames IA USA 50011 IA 50011 USA
Citazione:
B.J. Wilsey, "Effects of elevated CO2 on the response of Phleum pratense and Poa pratensis to aboveground defoliation and root-feeding nematodes", INT J PL SC, 162(6), 2001, pp. 1275-1282

Abstract

Because of the importance of herbivory in many herbaceous plant-dominated ecosystems, it will be important to determine whether interactions exist between herbivory and CO2 enrichment if we are to understand better how ecosystems will respond to global change. In an experiment with the C-3 grasses Poa pratensis and Phleum pratense, plants were grown together under ambient(360 ppm) and elevated (650 ppm) CO2, with and without aboveground defoliation, and with or without additions of the root-feeding nematode Pratylenchus penetrans. The objective was to determine whether herbivory would interact with CO2 enrichment in determining biomass responses or whether these factors were additive. Responses to CO2 enrichment were different between species. Poa root and shoot biomasses were unresponsive to CO2 enrichment, whereas Phleum showed a large increase in aboveground biomass and productivityin response to CO2 enrichment. As a result, Phleum was much more dominant over Poa in mixture under elevated CO2 than under ambient CO2. Elevated CO2tended to dampen the increases in productivity associated with defoliation, but this interaction was not quite significant (P = 0.07). Aboveground biomass and productivity were not significantly reduced by nematode additions. Root 0.07 biomass (Phleum + Poa) declined with high nematode infestation rates, and this decline was greater with CO2 enrichment and without defoliation.

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Documento generato il 29/09/20 alle ore 23:45:07