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Title (Primary) Fate of ectomycorrhizal fungal biomass in a soil bioreactor system and its contribution to soil organic matter formation
Author Schweigert, M.; Herrmann, S.; Miltner, A.; Fester, T.; Kästner, M.;
Journal Soil Biology & Biochemistry
Year 2015
Department UMB; UBT;
Volume 88
Language englisch;
POF III (all) T41;
Keywords Ectomycorrhizal fungi (EMF); Laccaria bicolor; Soil organic matter (SOM); 13C-labeled biomass; PLFA; 13C mass balance
UFZ wide themes RU3;
Abstract Forest soils constitute a major carbon pool in the context of the global carbon cycle. Although ectomycorrhizal fungi (EMF) are responsible for a large part of the input of carbon into this pool, information on the transformation of EMF biomass into soil organic matter (SOM) is scarce. In order to quantitatively analyze the contribution of EMF biomass to SOM formation, we incubated a typical forest arenosol with 13C-labeled fungal biomass from the ectomycorrhizal basidiomycete Laccaria bicolor in a closed bioreactor system for 231 d, enabling the establishment of a full mass balance for the turnover. rDNA fragments specific for the genus Laccaria disappeared after 28 d, indicating death and decay of the organism. The amount of 13C PLFA as a proxy for living biomass decreased to roughly 10% of the initial value in the course of the experiment, again suggesting efficient disintegration of the fungal organism. After 231 d, however, 63.5% of the initially added 13C had been converted to SOM and 52% belonged to the non-living fraction. The analysis of 13CO2 formation (36.5% of the initially added label) suggested two-pool exponential kinetics with k1 = 0.0615 d−1 for the easily degradable and k2 = 0.0005 d−1 for the stable fraction (pool sizes 74% and 26% of the initially added label, respectively). When compared to the degradation of bacterial biomass in agricultural soils, the pool of readily degradable fungal biomass was considerably smaller and the half-lives of both pools (readily degradable and persistent C) were markedly higher for fungal biomass. In summary, our data allow the conclusion that EMF biomass is a significant source of SOM in forest ecosystems.
ID 16281
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=16281
Schweigert, M., Herrmann, S., Miltner, A., Fester, T., Kästner, M. (2015):
Fate of ectomycorrhizal fungal biomass in a soil bioreactor system and its contribution to soil organic matter formation
Soil Biol. Biochem. 88 , 120 - 127