Tree-mycorrhiza symbiosis accelerate mineral weathering: Evidences from nanometer-scale elemental fluxes at the hypha–mineral interface

摘要: Abstract In soils, mycorrhiza (microscopic fungal hypha) living in symbiosis with plant roots are the biological interface by which plants obtain, from rocks and organic matter, nutrients necessary for their growth maintenance. Despite central role mechanism kinetics of mineral alteration poorly constrained quantitatively. Here, we report situ quantification weathering rates a substrate, (0 0 1) basal plane biotite, surface-bound hypha Paxillus involutus, grown association root system Scots pine, Pinus sylvestris. Four thin-sections were extracted focused ion beam (FIB) milling along single over biotite surface. Depth-profile Si, O, K, Mg, Fe Al concentrations performed at hypha–biotite scanning transmission electron microscopy-energy dispersive X-ray spectroscopy (STEM-EDX). Large removals K (50–65%), Mg (55–75%), (80–85%) (75–85%) observed topmost 40 nm underneath while Si O preserved throughout depth-profile. A quantitative model hypha-scale was developed based on solid-state diffusion fluxes elements into break-down/mineralogical re-arrangement biotite. strong acidification also bound to surface reaching pH