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© 1995 Oxford University Press

RESEARCH-ARTICLE

Effects of nitrogen on Pinus palustris foliar respiratory responses to elevated atmospheric CO2 concentration

R.J. Mitchell1,6, G.B. Runion2, S.A. Prior3, H.H. Rogers3, J.S. Amthor4 and F.P. Henning5

1Jones Ecological Research Center RR2, Box 2324, Newton, GA 31770, USA
2School of Forestry, Auburn University AL 36849, USA
3USDA-ARS, National Soil Dynamics Laboratory Auburn, AL 36849, USA
4Global Climate Research Division, Lawrence Livermore National Laboratory Livermore, CA 94550, USA
5Agronomy Department, Auburn University AL 36849, USA

6To whom correspondence should be addressed. Fax: +1 912 734 4707.

Indirect effects of atmospheric CO2 concentration [CO2], on longleaf pine (Pinus palustris Mill.) foliage respiration were studied by growing trees in a factorial arrangement of low and high [CO2] (369 and 729µmol CO2 mol–1) and low and high N (40 and 400 kg ha–1 yr–1). Direct effects of [CO2] on leaf respiration were tested by measuring respiration rates of foliage from all treatments at two CO2 levels (360 and 720µmol CO2mol–1) at the time of measurement. Elevated CO2 did not directly or indirectly affect leaf respiration when expressed on a leaf area or mass basis, but a significant increase in respiration per unit leaf N was observed in trees grown in elevated [CO2] (indirect response to elevated [CO2]). The lack of a [CO2] effect on respiration, when analysed on an area or mass basis, may have resulted from combined effects of [CO2] on factors that increase respiration (e.g. greater availability of non-structural carbohydrates stimulating growth and carbon export from leaves) and on factors that decrease respiration (e.g. lower N concentration leading to lower construction costs and maintenance requirements). Thus, [CO2] affected factors that influence respiration, but in opposing ways.

Key words: Pinus palustris, elevated CO2, nitrogen, foliar, respiration


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