The effect of elevated carbon dioxide on a Sierra-Nevadan dominant species: Pinus ponderosa

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The impact of increasing atmospheric C0{sub 2} has not been fully evaluated on western coniferous forest species. Two year old seedlings of Pinusponderosa were grown in environmentally controlled chambers under increased C0{sub 2} conditions for 6 months. These trees exhibit morphological, physiological, and biochemical alterations when compared to our controls. Analysis of whole plant biomass distribution has shown no significant effect to the root to shoot ratios, however needles subjected to elevated C0{sub 2} exhibited an increased overall specific needle mass and a decreased total needle area. Morphological changes at the needle level included decreased mesophyll to vascular tissue 91 ... continued below

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14 p.

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Pushnik, J.C.; Demaree, R.S.; Flory, W.B.; Bauer, S.M.; Houpis, J.L.J. & Anderson, P.D. January 1, 1995.

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The impact of increasing atmospheric C0{sub 2} has not been fully evaluated on western coniferous forest species. Two year old seedlings of Pinusponderosa were grown in environmentally controlled chambers under increased C0{sub 2} conditions for 6 months. These trees exhibit morphological, physiological, and biochemical alterations when compared to our controls. Analysis of whole plant biomass distribution has shown no significant effect to the root to shoot ratios, however needles subjected to elevated C0{sub 2} exhibited an increased overall specific needle mass and a decreased total needle area. Morphological changes at the needle level included decreased mesophyll to vascular tissue 91 ratio and variations in starch storage in chloroplasts. The elevated CO{sub 2} increased internal CO{sub 2} concentrations and assimilation of carbon. Biochemical assays revealed that ribulose-bisphosphate carboxylase specific activities increased on per unit area basis with C0{sub 2} treatment levels. Sucrose phosphate synthase (SPS) activities exhibited an increase of 55% in the 700 uL L{sup {minus}1} treatment. These results indicate that the sink-source relationships of these trees have shifted carbon allocation toward above ground growth, possibly due to transport limitations.

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14 p.

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INIS; OSTI as DE95008831

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  • Air and Waste Management Association meeting, San Antonio, TX (United States), 18-23 Jun 1995

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  • Other: DE95008831
  • Report No.: UCRL-JC--119717
  • Report No.: CONF-950646--7
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 36590
  • Archival Resource Key: ark:/67531/metadc683643

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  • January 1, 1995

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 16, 2016, 6:33 p.m.

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Pushnik, J.C.; Demaree, R.S.; Flory, W.B.; Bauer, S.M.; Houpis, J.L.J. & Anderson, P.D. The effect of elevated carbon dioxide on a Sierra-Nevadan dominant species: Pinus ponderosa, article, January 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc683643/: accessed July 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.