Journal Article

FZJ-2021-04686

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The molecular composition of extractable soil microbial compounds andtheir contribution to soil organic matter vary with soil depth andtree species

Marcel, L. ; Hofmann, D.FZJ* ; Steffen, B. ; Fischer, K. ; Thiele-Bruh, S. (Corresponding author)

2021
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/29244  doi:10.1016/j.scitotenv.2021.146732

Abstract: Recent findings on soil organic matter (SOM) revealed that soil microorganisms are not only crucial for SOMformationthrough plant litter degradation but soil microbial biomass (SMB) may also directly contribute to SOMand its composition. However, the role and interactions of litter quality, microbial turnover and composition ofSMB and SOM remain unclear. Hence, soil profiles (organic forest floor and mineral soil layers) at a recultivatedand afforested post-mining site were investigated for the influence of litter quality from different tree species(Fagus sylvatica, Pseudotsuga menziesii, Pinus nigra) and soil depth – representing different degrees of organicmatter (OM) turnover – on the molecular composition of chloroform fumigation extracted SMB-derived compoundsin comparison with easily extractable (non-fumigated) SOM-derived compounds. The SMB extractswere analyzed for microbial biomass carbon (MBC), nitrogen(MBN) and phosphorus (MBP). Themolecular compositionof SMB and SOMcompoundswere determined by electrospray ionization Fourier transformation ion cyclotronresonance mass spectrometry (ESI-FT-ICR-MS) complemented by the determination of ninemonosaccharides representing microbial or plant origin.Van Krevelen diagrams obtained from the ESI-FT-ICR mass spectra revealed the substantial contribution ofmicrobial-derived compounds to extractable SOMthat further increasedwith soil depth. Analysis of the easily extractablemonosaccharidesimplied that>99%were of microbial origin. Microbial sugars aswell asMBC,MBNandMBP explained best depth-related variations of extractable SMB compounds indicating that supply and availabilityof C-rich OM drive these parameters. Furthermore, the contribution of microbial sugar C to MBC increasedwith depth, suggesting that recycling of carbohydrates is an adaptation strategy of microorganisms in C-limited environments. The supply of tree species-specific substratesresulted in different chemical composition of SMB with largest differences between deciduous and coniferous stands and vice versa, microorganisms contributed to SOM resulting in large similarity in the composition of SOM and SMB.

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. 2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217) (POF4-217)

Appears in the scientific report 2021

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Database coverage:
; ; ; BIOSIS Previews ; Biological Abstracts ; Clarivate Analytics Master Journal List ; Current Contents - Agriculture, Biology and Environmental Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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