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03 Mar 2010
Status : this preprint was under review for the journal BG but the revision was not accepted.
Technical Note: A combined soil/canopy chamber system for tracing δ13 C in soil respiration after a 13 CO2 canopy pulse labelling
M. Barthel , P. Sturm , L. Gentsch , and A. Knohl
In this study we present a combined soil/canopy chamber system that allows the investigation of carbon flow through the atmosphere-plant-soil system via a 13 CO2 canopy labelling approach – especially when using short vegetation such as tree saplings. The developed chamber system clearly separates soil and canopy compartment in order to (a) prevent physical diffusion of 13 C tracer into the soil chamber during a 13 CO2 canopy pulse labelling (b) study stable isotope processes in soil and canopy individually and independently. In combination with novel laser spectrometry, measuring CO2 (Aerodyne Research Inc.) and H2 O (Los Gatos Research Inc.) isotopologue mixing ratios at a rate of 1 Hz, we were able to trace the label transport from leaves to roots in small beech saplings (Fagus sylvatica L.) without interference due to contamination of the soil matrix and/or canopy re-labelling via tracer returning from soil respiration. A very tight coupling between above- (photosynthesis) and belowground (soil respiration) processes was found, where newly assimilated carbon fixed from the 13 CO2 atmosphere re-appeared in soil respiration 2 h after it has been photosynthetically fixed. We were able to demonstrate that leaf metabolism acts on substrate for soil respiration on a diurnal timescale, with input of fresh photosynthates during daytime and starch re-mobilisation during nighttime. Long-term fluctuations in the δ13 C of soil respiration, as observed under reduced water availability, could not be described by any biological or instrumental mechanism, as they did occur in an atypical ca. 15 hourly rhythm – potential mechanisms driving these fluctuations are hypothesized.
Received: 11 Feb 2010 – Discussion started: 03 Mar 2010
M. Barthel , P. Sturm , L. Gentsch , and A. Knohl
Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
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Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
M. Barthel , P. Sturm , L. Gentsch , and A. Knohl
M. Barthel , P. Sturm , L. Gentsch , and A. Knohl
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