Effects of elevated CO{sub 2}, nitrogen and water on net photosynthesis and foliar nitrogen concentration of loblolly pine trees
Journal Article
·
· Bulletin of the Ecological Society of America
OSTI ID:95854
- North Carolina State Univ., Raleigh, NC (United States); and others
Branches of nine year old loblolly pine trees grown in a 2*2 factorial of fertilizer and irrigation were exposed for 10 months to ambient, ambient+175 and ambient+350 umolmol-1 CO{sub 2} concentrations. Light saturated net photosynthesis (Amax) averaged over the 10 month study period increased by 87% in the ambient+350 and by 41% in the ambient+175 treatments relative to that observed at ambient CO{sub 2} concentration. Observed increases in Amax in response to elevated CO{sub 2} did not appear to be limited by site resources like water and nutrients. No significant response of stomatal conductance was observed to elevated CO{sub 2}. Positive linear correlation between Amax and foliar N indicated that at any given foliar N concentration, Amax was highest in the ambient+350, intermediate in the ambient+175 and lowest in the ambient CO{sub 2} treatments respectively. Elevated CO{sub 2} decreased foliar N in all treatment combinations.
- OSTI ID:
- 95854
- Report Number(s):
- CONF-9507129--
- Journal Information:
- Bulletin of the Ecological Society of America, Journal Name: Bulletin of the Ecological Society of America Journal Issue: 2 Vol. 76; ISSN BECLAG; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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