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\begin{document}

\title{A group of ectomycorrhizal fungi restricts organic matter accumulation
in boreal forest}



\author[1]{Björn Lindahl}%
\author[1]{Julia Kyaschenko}%
\author[1]{Kerstin Varenius}%
\author[1]{Karina Clemmensen}%
\author[1]{Anders Dahlberg}%
\author[1]{Erik Karltun}%
\author[1]{Johan Stendahl}%
\affil[1]{Swedish University of Agricultural Sciences}%


\vspace{-1em}



  
  \date{June 13, 2024}


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\begin{abstract}
Boreal forests soils are important global carbon sinks, with significant
storage in the organic topsoil. Decomposition of these stocks requires
oxidative enzymes, uniquely produced by fungi, of which many live in
ectomycorrhizal symbiosis with the trees. Here we show that presence of
a group of closely related species of ectomycorrhizal fungi --
\emph{Cortinarius acutus} s.l. -- decreased local carbon storage in the
organic topsoil by 33\% across Swedish forests. Our findings challenge
the prevailing view that ectomycorrhizal fungi generally act to increase
carbon storage in soils and show that certain ectomycorrhizal fungi can
complement free-living decomposers, maintaining nutrient cycling and
tree productivity under nutrient poor conditions. The finding that a
narrow group of fungi exerts a major influence on carbon cycling refutes
the prevailing dogma of functional redundancy among microbial
decomposers. \emph{Cortinarius acutus} s.l. responds negatively to
forestry, and population declines are likely to increase soil carbon
sequestration while impeding nutrient cycling.%
\end{abstract}%



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