Journal Article

Fine root respiration in mature eastern white pine (<i>Pinus strobus</i>) <i>in situ</i>: the importance of CO<sub>2</sub> in controlled environments

Barton D. Clinton and James M. Vose

in Tree Physiology

Volume 19, issue 7, pages 475-479
Published in print June 1999 | ISSN: 0829-318X
Published online June 1999 | e-ISSN: 1758-4469 | DOI:
Fine root respiration in mature eastern white pine (Pinus strobus) in situ: the importance of CO2 in controlled environments

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We measured seasonal fine root respiration rate in situ while controlling chamber temperature and [CO2]. Atmospheric [CO2] ([CO2]a) and measured soil [CO2] ([CO2]s) were alternately delivered to a cuvette containing intact fine roots of eastern white pine (Pinus strobus L.). Respiration rates were consistently higher in [CO2]a than in [CO2]s and were almost three times higher during midsummer. Respiration rates were immediately reversed after returning to the alternate [CO2] (i.e., [CO2]a → [CO2]s → [CO2]a, and vice versa) suggesting a direct effect of elevated [CO2] on apparent respiration. Soil-[CO2]-based respiration rates decreased with increasing [CO2] on a dry mass and tissue [N] basis. We conclude that estimates of soil CO2 flux and soil carbon budgets may be improved by more completely accounting for the rhizosphere microclimate (i.e., soil temperature and [CO2]s) during measurement of fine root respiration.

Keywords: atmospheric carbon dioxide; carbon dioxide inhibition; rhizosphere microclimate; soil carbon dioxide; soil temperature

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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