Components of forest soil CO2 efflux estimated from Δ14C values of soil organic matter

Rodeghiero, Mirco, Churkina, Galina, Martinez, Cristina, Scholten, Thomas, Gianelle, Damiano and Cescatti, Alessandro (2013) Components of forest soil CO2 efflux estimated from Δ14C values of soil organic matter. Plant and Soil, 364 1: 55-68. doi:10.1007/s11104-012-1309-1


Author Rodeghiero, Mirco
Churkina, Galina
Martinez, Cristina
Scholten, Thomas
Gianelle, Damiano
Cescatti, Alessandro
Title Components of forest soil CO2 efflux estimated from Δ14C values of soil organic matter
Formatted title
Components of forest soil CO2 efflux estimated from Δ14C values of soil organic matter
Journal name Plant and Soil   Check publisher's open access policy
ISSN 0032-079X
1573-5036
Publication date 2013-03-01
Year available 2012
Sub-type Article (original research)
DOI 10.1007/s11104-012-1309-1
Open Access Status Not yet assessed
Volume 364
Issue 1
Start page 55
End page 68
Total pages 14
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Language eng
Formatted abstract
Aims: The partitioning of the total soil CO2 efflux into its two main components: respiration from roots (and root-associated organisms) and microbial respiration (by means of soil organic matter (SOM) and litter decomposition), is a major need in soil carbon dynamics studies in order to understand if a soil is a net sink or source of carbon.

Methods: The heterotrophic component of the CO2 efflux was estimated for 11 forest sites as the ratio between the carbon stocks of different SOM pools and previously published (Δ14C derived) turnover times. The autotrophic component, including root and root-associated respiration, was calculated by subtracting the heterotrophic component from total soil chamber measured CO2 efflux.

Results: Results suggested that, on average, 50. 4 % of total soil CO2 efflux was derived from the respiration of the living roots, 42. 4 % from decomposition of the litter layers and less than 10 % from decomposition of belowground SOM.

Conclusions: The Δ14C method proved to be an efficient tool by which to partition soil CO2 efflux and quantify the contribution of the different components of soil respiration. However the average calculated heterotrophic respiration was statistically lower compared with two previous studies dealing with soil CO2 efflux partitioning (one performed in the same study area; the other a meta-analysis of soil respiration partitioning). These differences were probably due to the heterogeneity of the SOM fraction and to a sub-optimal choice of the litter sampling period.
Keyword Carbon-14 isotope
Forest ecosystems
Soil organic matter fractions
Soil respiration partitioning
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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