caa a22 4500 397521855 CHVBK 20180308164635.0 cr unu---uuuuu 161202e199510 xx s 000 0 eng 10.1093/jxb/46.10.1561 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.10.1561 Effects of nitrogen on Pinus palustris foliar respiratory responses to elevated atmospheric CO2 concentration [Elektronische Daten] [R.J. Mitchell, G.B. Runion, S.A. Prior, H.H. Rogers, J.S. Amthor, F.P. Henning] 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. © Oxford University Press Research Papers nationallicence Pinus palustris nationallicence elevated CO2 nationallicence nitrogen nationallicence foliar nationallicence respiration nationallicence Mitchell R.J. Jones Ecological Research Center RR2, Box 2324, Newton, GA 31770, USA aut Runion G.B. School of Forestry, Auburn University AL 36849, USA aut Prior S.A. USDA-ARS, National Soil Dynamics Laboratory Auburn, AL 36849, USA aut Rogers H.H. USDA-ARS, National Soil Dynamics Laboratory Auburn, AL 36849, USA aut Amthor J.S. Global Climate Research Division, Lawrence Livermore National Laboratory Livermore, CA 94550, USA aut Henning F.P. Agronomy Department, Auburn University AL 36849, USA aut Journal of Experimental Botany Oxford University Press 46/10(1995-10), 1561-1567 0022-0957 46:10<1561 1995 46 exbotj https://doi.org/10.1093/jxb/46.10.1561 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.10.1561 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mitchell R.J. Jones Ecological Research Center RR2, Box 2324, Newton, GA 31770, USA aut NATIONALLICENCE 700 1- Runion G.B. School of Forestry, Auburn University AL 36849, USA aut NATIONALLICENCE 700 1- Prior S.A. USDA-ARS, National Soil Dynamics Laboratory Auburn, AL 36849, USA aut NATIONALLICENCE 700 1- Rogers H.H. USDA-ARS, National Soil Dynamics Laboratory Auburn, AL 36849, USA aut NATIONALLICENCE 700 1- Amthor J.S. Global Climate Research Division, Lawrence Livermore National Laboratory Livermore, CA 94550, USA aut NATIONALLICENCE 700 1- Henning F.P. Agronomy Department, Auburn University AL 36849, USA aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/10(1995-10), 1561-1567 0022-0957 46:10<1561 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford