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#Fungal weathering in the lab  Fuelled by carbohydrate supplied by the host, many ectomycorrhizal fungi (EMF)  have the capacity to acidify the surrounding substrate and exude organic acids, both when growing in axenic cultures and in symbiosis with plants under laboratory conditions (\cite{Rosling_2009}, \cite{Hoffland_2004}, \cite{Schmalenberger_2015}. Using flow through systems, \cite{Calvaruso_2013} estimated weathering rates to be 10 times higher when ectomycorrhizal pine seedlings were present compared to unplanted systems, and attributed this to exudation of organic acids and acidifying effects by the EMF fungus. EMF.  There is however, a large step to transfer these results to natural systems according to the authors. Similar activities can be performed by other microorganisms in the soil. For instance, many soil bacteria have a strong capacity to acidify the surrounding when sufficient carbon resources is available. Trees foster specific communities of bacteria in the rhizosphere, or mycorrhizasphere (\cite{Collignon_2011}, \cite{Calvaruso_2013}Calvarusu 2008), and these organisms may be the active partner of weathering reactions in the soil (review by \cite{Uroz_2009}). In addition, brown rotting fungi produce large amounts of oxalic acids when degrading wood (ref), which may have secondary effects on phosphorous release from the soil (\cite{Fransson_2004}.