caa a22 4500 46788580X CHVBK 20180406152734.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s10021-006-0110-5 doi (NATIONALLICENCE)springer-10.1007/s10021-006-0110-5 Effects of Elevated Atmospheric Carbon Dioxide and Temperature on Soil Respiration in a Boreal Forest Using δ13C as a Labeling Tool [Elektronische Daten] [Daniel Comstedt, Björn Boström, John Marshall, Anders Holm, Michelle Slaney, Sune Linder, Alf Ekblad] This study examines the effect of elevated atmospheric carbon dioxide [CO2] (+340 ppm, 13C-depleted) and/or elevated air temperature (2.8-3.5°C) on the rate and δ13C of soil respiration. The study was conducted in a boreal Norway spruce forest using temperature-controlled whole-tree chambers and 13C as a marker for root respiration. The δ13C of needle carbohydrates was followed after the onset of the CO2 treatment in August 2001 and during a 2.5-week period in the summer of 2002. Averaged over the growing seasons of 2002 and 2003, we observed a 48% and 62% increase, respectively, in soil respiration in response to elevated [CO2], but no response to elevated air temperature. The percentage increase in response to elevated [CO2] varied seasonally (between 10% and 190% relative to the control), but the absolute increase varied less (39 ± 11 mg C m−2 h−1; mean ± SD). Data on δ13C of soil respiration indicate that this increase in soil respiration rate resulted from increased root/rhizosphere respiration of recently fixed carbon. Our results support the hypothesis that root/rhizosphere respiration is sensitive to variation in substrate availability. Springer Science+Business Media, Inc., 2007 root respiration nationallicence soil respiration nationallicence stable carbon isotope nationallicence δ13C nationallicence atmospheric carbon dioxide nationallicence elevated temperature nationallicence boreal forest nationallicence Sweden nationallicence Comstedt Daniel Department of Natural Sciences, Örebro University, SE-70182, Örebro, Sweden aut Boström Björn Department of Natural Sciences, Örebro University, SE-70182, Örebro, Sweden aut Marshall John Department of Forest Resources, University of Idaho, 83844, Moscow, Idaho, USA aut Holm Anders Department of Natural Sciences, Örebro University, SE-70182, Örebro, Sweden aut Slaney Michelle Southern Swedish Forest Research Center, Swedish University of Agricultural Sciences, SE-23053, Alnarp, Sweden aut Linder Sune Southern Swedish Forest Research Center, Swedish University of Agricultural Sciences, SE-23053, Alnarp, Sweden aut Ekblad Alf Department of Natural Sciences, Örebro University, SE-70182, Örebro, Sweden aut Ecosystems Springer-Verlag; www.springer-ny.com 9/8(2006-12-01), 1266-1277 1432-9840 9:8<1266 2006 9 10021 https://doi.org/10.1007/s10021-006-0110-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-006-0110-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Comstedt Daniel Department of Natural Sciences, Örebro University, SE-70182, Örebro, Sweden aut NATIONALLICENCE 700 1- Boström Björn Department of Natural Sciences, Örebro University, SE-70182, Örebro, Sweden aut NATIONALLICENCE 700 1- Marshall John Department of Forest Resources, University of Idaho, 83844, Moscow, Idaho, USA aut NATIONALLICENCE 700 1- Holm Anders Department of Natural Sciences, Örebro University, SE-70182, Örebro, Sweden aut NATIONALLICENCE 700 1- Slaney Michelle Southern Swedish Forest Research Center, Swedish University of Agricultural Sciences, SE-23053, Alnarp, Sweden aut NATIONALLICENCE 700 1- Linder Sune Southern Swedish Forest Research Center, Swedish University of Agricultural Sciences, SE-23053, Alnarp, Sweden aut NATIONALLICENCE 700 1- Ekblad Alf Department of Natural Sciences, Örebro University, SE-70182, Örebro, Sweden aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag; www.springer-ny.com 9/8(2006-12-01), 1266-1277 1432-9840 9:8<1266 2006 9 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer