Interactions among decaying leaf litter, root litter and soil organic matter vary with mycorrhizal type

We incubated root and leaf litter (alone and in combination) from arbuscular mycorrhizal
(AM) and ectomycorrhizal (ECM) trees in soils collected from forest plots
dominated by AM and ECM trees in a factorial design. In each microcosm, we quantified
litter decay rates and the effects of decaying litters on soil C balance. We
hypothesized that (1) AM root litters would decompose faster than ECM root litters,
(2) root litter decay would be greatest when decomposed in “home” soils (e.g.
AM litters in AM soils and ECM litters in ECM soils) and (3) root and leaf litters
would decompose faster when decaying in the same microcosms than when decaying
in separate microcosms, resulting in the largest CO2 losses.
Synthesis: Our results suggest that root, leaf and soil organic matter (SOM) decay
are intertwined, and that measurements of these processes in isolation may lead to
incorrect estimates of the magnitude and source of C losses from soils.