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Fast incorporation of root-derived lipids and fatty acids into soil – Evidence from a short term multiple 14CO2 pulse labelling experiment

Title data

Wiesenberg, Guido L. B. ; Gocke, Martina ; Kuzyakov, Yakov:
Fast incorporation of root-derived lipids and fatty acids into soil – Evidence from a short term multiple 14CO2 pulse labelling experiment.
In: Organic Geochemistry. Vol. 41 (2010) Issue 9 . - pp. 1049-1055.
ISSN 1873-5290
DOI: https://doi.org/10.1016/j.orggeochem.2009.12.007

Abstract in another language

Plant-derived lipids are regarded to be mainly incorporated into soil via above ground biomass. The contributionof root-derived lipids to soil organic matter (SOM) is not easily accessible, so this incorporationpathway is mostly underestimated, whereas it is common knowledge that the contribution of rhizodepositsto SOM is of major importance for the turnover of organic carbon. Not only the contribution,but also the incorporation rates and turnover time of exclusively root-derived lipids remain unknown.We determined for the first time the incorporation rates of rhizodeposit-derived lipids into soil plantedwith Lolium perenne, using a multiple 14CO2 pulse labelling experiment carried out under controlled laboratoryconditions. Additionally, we accessed differences in lipid composition between the rhizosphereand root-free soil to evaluate the direct contribution of root-derived lipids to SOM. The lipid compositionin the rhizosphere clearly showed a greater abundance of microbial lipids like C16:1 and C18:1, as well asroot-derived C18:2+3 fatty acids (FAs) than the initial and root-free soil. The incorporation rates of totallipids (kLip) and FAs (kFA) based on 14C data revealed a very fast incorporation into SOM (rhizosphere: kLip0.82 year1; kFA 0.31 year1; root-free soil: kLip 0.70 year1; kFA 0.48 year1) after the first 14C pulse foryoung plants. Thereafter, incorporation rates decreased until the end of the experiment (rhizosphere: kLip0.17 year1; kFA 0.03 year1; root-free loess: kLip 0.11 year1; kFA 0.06 year1). The incorporation ratesresulting from the 14C pulse labelling experiment are comparable to turnover rates of total, i.e. aboveground and root-derived, and lipids from field experiments using 13C labelling approaches. The fast allocationof root-derived lipids to substrate beneath, and distant from, roots gives new insights into the carbonincorporation of OM on a molecular level. This implies that incorporation of lipid compounds,especially into soil deeper than the uppermost few centimetres or the ploughing layer, is mainly dueto root-derived OM, in contrast to common knowledge.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER77688
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 22 Jul 2015 06:23
Last Modified: 22 Jul 2015 06:23
URI: https://eref.uni-bayreuth.de/id/eprint/17021