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Stable isotopes reveal that fungal residues contribute more to mineral-associated organic matter pools than plant residues

Titelangaben

Klink, Saskia ; Keller, Adrienne B. ; Wild, Andreas J. ; Baumert, Vera L. ; Gube, Matthias ; Lehndorff, Eva ; Meyer, Nele ; Mueller, Carsten W. ; Phillips, Richard P. ; Pausch, Johanna:
Stable isotopes reveal that fungal residues contribute more to mineral-associated organic matter pools than plant residues.
In: Soil Biology & Biochemistry. Bd. 168 (2022) . - 108634.
ISSN 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2022.108634

Abstract

We still lack crucial knowledge about the contribution of plant vs. microbial residues to specific SOM pools, particularly the relative contribution of arbuscular (AM), ectomycorrhizal (ECM), and saprotrophic (SAP) fungi.

We investigated sources of particulate and mineral-associated organic matter (POM and MAOM) around trees with distinct mycorrhizal types, Liriodendron tulipifera (AM-association) and Quercus alba (ECM-association), in a temperate deciduous forest in Indiana, USA. Combining 13C and 15N natural abundance analyses with measurements of microbial residues using amino sugars, the isotope signatures of large, medium and small-sized POM and MAOM fractions were compared with those of leaves, roots and biomass of mycorrhizal and saprotrophic fungi. A Bayesian inference isotope mixing model calculated sources of C and N to SOM fractions.

While the isotope composition of POM resembled that of plants, MAOM was close to fungal values. This was confirmed by mixing model calculations and microbial residue analysis, which additionally and independent from tree partner suggested saprobic fungi contributing with 4–53% to POM and 23–42% to MAOM, as opposed to ECM contributions.

Our results suggest fungal, not plant residues, as the source of the most putatively stable OM pool; thus, altering fungal communities may enhance efforts to increase long-term soil C storage.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Amino sugars; Mineral-associated organic matter; MEMS hypothesis; Particulate organic matter; Stable isotopes; Soil organic matter dynamics
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Agrarökologie > Professur Agrarökologie - Juniorprof. Dr. Johanna Pausch
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Agrarökologie
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
500 Naturwissenschaften und Mathematik > 570 Biowissenschaften; Biologie
Eingestellt am: 17 Okt 2023 07:22
Letzte Änderung: 17 Jun 2024 13:12
URI: https://eref.uni-bayreuth.de/id/eprint/87238