Rangeland plant response to elevated CO{sub 2}. Annual report, 1991

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Effects of carbon dioxide enrichment on a tallgrass ecosystem were monitored during the 1990 growing season. The chambers, CO{sub 2} delivery system, and data acquisition and control system were in place and operational by 4 April 1990. CO{sub 2} fumigation and data acquisition began on that date. Nitrogen fertilizer as ammonium nitrate was applied at a rate of 45 kg ha {sup -1} on 1 April to the N-fertilized plots. The chambers were 4.5 m in diameter and 4 m in height to allow for destructive sampling for biomass accumulation, leaf area determination, and for grazing esophageally-fistulated sheep. The experimental ... continued below

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6 p.

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Owensby, C.E.; Coyne, P.I.; Ham, J.M.; Parton, W.; Rice, C.; Auen, L.M. et al. December 31, 1991.

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Description

Effects of carbon dioxide enrichment on a tallgrass ecosystem were monitored during the 1990 growing season. The chambers, CO{sub 2} delivery system, and data acquisition and control system were in place and operational by 4 April 1990. CO{sub 2} fumigation and data acquisition began on that date. Nitrogen fertilizer as ammonium nitrate was applied at a rate of 45 kg ha {sup -1} on 1 April to the N-fertilized plots. The chambers were 4.5 m in diameter and 4 m in height to allow for destructive sampling for biomass accumulation, leaf area determination, and for grazing esophageally-fistulated sheep. The experimental site was located in pristine Tallgrass Prairie north of/and adjacent to the Kansas State University campus. Vegetation on the site was a mixture of C3 and C4 species and was dominated by big bluestem (Andropogon geradii vitman) and indiangrass (Sorghastrum nutans (L.) Nash). Subdominants included Kentucky bluegrass (Poa pratensis L.), sideoats grama (Bouteloua curtipendula (Michx.) Torr.), and tall dropseed (Sporobolus asper var. asper (Michx.) Kunth). Members of the sedge family made up 5-10% of the composition. Principal forbs included western ragweed (Ambrosia psilostachya DC.), Louisiana sagewort (Artemesia ludoviciana Nutt.), and mayflower scurfpea (Psoralea tenuiflora var. floribunda (Nutt.) Rydb.). Average peak biomass occurs in early August at 425 g m{sup -2} of which 35 g m{sup -2} is from forbs. The area was ideal for meeting the experimental objectives, in that the mixture of C3 and C4 plants would allow for assessment of competitive relationships among numerous species of both carbon fixation pathways.

Physical Description

6 p.

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OSTI as DE96013935

Medium: P; Size: 6 p.

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  • Other Information: PBD: 1991

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  • Other: DE96013935
  • Report No.: DOE/ER/60253--T9
  • Grant Number: FG02-84ER60253
  • DOI: 10.2172/373761 | External Link
  • Office of Scientific & Technical Information Report Number: 373761
  • Archival Resource Key: ark:/67531/metadc685338

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  • December 31, 1991

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 13, 2017, 12:42 p.m.

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Owensby, C.E.; Coyne, P.I.; Ham, J.M.; Parton, W.; Rice, C.; Auen, L.M. et al. Rangeland plant response to elevated CO{sub 2}. Annual report, 1991, report, December 31, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc685338/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.