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A comparison of methods to determine the biodegradable dissolved organic carbon from different terrestrial sources

Title data

McDowell, William H. ; Zsolnay, A. ; Aitkenhead-Peterson, Jacqueline A. ; Gregorich, E. G. ; Jones, Davey L. ; Jödemann, D. ; Kalbitz, Karsten ; Marschner, Bernd ; Schwesig, David:
A comparison of methods to determine the biodegradable dissolved organic carbon from different terrestrial sources.
In: Soil Biology & Biochemistry. Vol. 38 (2006) Issue 7 . - pp. 1933-1942.
ISSN 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2005.12.018

Abstract in another language

The importance of dissolved organic matter (DOM) in many soil processes is determined in large part by its availability to microbial uptake and decomposition, as this biodegradation can yield both energy and limiting nutrients. Despite its importance in soil ecology, there are no standard approaches to measuring the biodegradable fraction of DOC (BDOC) in soils. Here, we evaluate the comparability and reproducibility of methods employed in six laboratories including batch, kinetic, and bioreactor methods. Solutions from a variety of sources (throughfall, soil solution and soil extracts) were analysed using methods typically employed in each of the six participating laboratories. Our results show that the precision of various BDOC methods was similar (5–15%) across a broad range of BDOC (from 12% to 56% of total DOC). Differences in mean BDOC for the various test solutions were statistically significant when results were pooled across all the methods, and only a 90-day incubation resulted in consistently higher values for BDOC than the other methods. For 4 of 6 test solutions, measured BDOC increased by 6–13% with added nutrients. Current methods produce largely comparable results, providing the justification for comparisons among existing data sets collected with different methodologies. We recommend two standard methods for future studies: (1) a rapid determination of relatively labile DOC (measurement of DOC removal after 7 days of incubation with added nutrients) and (2) a 42-day incubation with repeated analysis of CO2 production when determination of decomposition rate constants and a labile and relatively refractory component of DOC is desired.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER27861
Keywords: Biodegradation; Bioavailability; Dissolved organic carbon; Method; Mineralization
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:33
Last Modified: 26 Feb 2016 10:37
URI: https://eref.uni-bayreuth.de/id/eprint/19174