NDLI: Mycorrhizal Hyphal Turnover as a Dominant Process for Carbon Input into Soil Organic Matter

Content Provider	Springer Nature Link
Author	Godbold, Douglas L. Hoosbeek, Marcel R. Lukac, Martin Cotrufo, M. Francesca Janssens, Ivan A. Ceulemans, Reinhart Polle, Andrea Velthorst, Eef J. Scarascia Mugzza, Giuseppe Angelis, Paolo Miglietta, Franco Peressotti, Alessandro
Copyright Year	2006
Abstract	The atmospheric concentration of CO$_{2}$ is predicted to reach double current levels by 2075. Detritus from aboveground and belowground plant parts constitutes the primary source of C for soil organic matter (SOM), and accumulation of SOM in forests may provide a significant mechanism to mitigate increasing atmospheric CO$_{2}$ concentrations. In a poplar (three species) plantation exposed to ambient (380 ppm) and elevated (580 ppm) atmospheric CO$_{2}$ concentrations using a Free Air Carbon Dioxide Enrichment (FACE) system, the relative importance of leaf litter decomposition, fine root and fungal turnover for C incorporation into SOM was investigated. A technique using cores of soil in which a C$_{4}$ crop has been grown (δ$^{13}$C −18.1‰) inserted into the plantation and detritus from C$_{3}$ trees (δ$^{13}$C −27 to −30‰) was used to distinguish between old (native soil) and new (tree derived) soil C. In-growth cores using a fine mesh (39 μm) to prevent in-growth of roots, but allow in-growth of fungal hyphae were used to assess contribution of fine roots and the mycorrhizal external mycelium to soil C during a period of three growing seasons (1999–2001). Across all species and treatments, the mycorrhizal external mycelium was the dominant pathway (62%) through which carbon entered the SOM pool, exceeding the input via leaf litter and fine root turnover. The input via the mycorrhizal external mycelium was not influenced by elevated CO$_{2}$, but elevated atmospheric CO$_{2}$ enhanced soil C inputs via fine root turnover. The turnover of the mycorrhizal external mycelium may be a fundamental mechanism for the transfer of root-derived C to SOM.
Starting Page	15
Ending Page	24
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	281
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	δ$^{13}$C abundance C sequestration EuroFACE mycorrhiza poplar SOM Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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