biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 52:299-306, 2008 | DOI: 10.1007/s10535-008-0063-y

Stem CO2 efflux of a Populus nigra stand: effects of elevated CO2, fertilization, and shoot size

M. Liberloo1,*, P. De Angelis2, R. Ceulemans1
1 Department of Biology, Campus Drie Eiken, University of Antwerp, Research Group of Plant and Vegetation Ecology, Wilrijk, Belgium
2 University of Tuscia, DISAFRI, Viterbo, Italy

To determine whether long-term growth in elevated atmospheric CO2 concentration [CO2] and nitrogen fertilization affects woody tissue CO2 efflux, we measured stem CO2 efflux as a function of temperature in three different size classes of shoots of Populus nigra L. (clone Jean Pourtet) on two occasions in 2004. Trees were growing in a short rotation coppice in ambient (370 µmol mol-1) and elevated (550 µmol mol-1, realised by a Free Air Carbon dioxide Enrichment system) [CO2], and measurements were performed during the third growing season of the second rotation. Elevated CO2 did not affect Q10 or specific stem CO2 efflux (E10) of overall poplar shoots. The lack of any effect of N on stem CO2 efflux indicated that nutrients were sufficient. Specific stem CO2 efflux differed significantly between shoot sizes, emphasizing the importance of tree size when scaling-up respiration measurements to the stand level. Variation in stem CO2 efflux could not be satisfactorily explained by temperature as the only driving variable. We hypothesize that transport of CO2 with the sapflow might have confounded our results and could explain the high Q10 values reported here. Predicting the respiratory carbon loss in a future elevated [CO2] world must therefore move beyond the single-factor temperature dependent respiration model and involve multiple factors affecting stem CO2 efflux rate.

Keywords: EUROFACE; growth rate; nitrogen; respiration; sap flow; size class; temperature function; woody tissue
Subjects: CO2 concentration, internal; gas exchange; growth analysis, biomass and yield enhancement; in vitro culture, cell suspension; nitrogen supply; Populus nigra; respiration

Received: October 2, 2006; Accepted: April 28, 2007; Published: June 1, 2008  Show citation

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Liberloo, M., De Angelis, P., & Ceulemans, R. (2008). Stem CO2 efflux of a Populus nigra stand: effects of elevated CO2, fertilization, and shoot size. Biologia plantarum, 52(2), 299-306. doi: 10.1007/s10535-008-0063-y
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