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

Bonneville, S.; Morgan, D. J.; Schmalenberger, A.; Bray, A.; Brown, A.; Banwart, S. A.; Benning, Liane G.

doi:10.1016/j.gca.2011.08.041

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

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

Authors

Bonneville, S.
External Organizations;

Morgan, D. J.
External Organizations;

Schmalenberger, A.
External Organizations;

Bray, A.
External Organizations;

Brown, A.
External Organizations;

Banwart, S. A.
External Organizations;

/persons/resource/benning

Benning, Liane G.
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Bonneville, S., Morgan, D. J., Schmalenberger, A., Bray, A., Brown, A., Banwart, S. A., Benning, L. G. (2011): Tree-mycorrhiza symbiosis accelerate mineral weathering: Evidences from nanometer-scale elemental fluxes at the hypha-mineral interface. - Geochimica et Cosmochimica Acta, 75, 22, 6988-7005.
https://doi.org/10.1016/j.gca.2011.08.041

Cite as: https://gfzpublic.gfz.de/pubman/item/item_806899

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, the nutrients necessary for their growth and maintenance. Despite their central role in soils, the mechanism and kinetics of mineral alteration by mycorrhiza are poorly constrained quantitatively. Here, we report in situ quantification of weathering rates from a mineral substrate, (001) basal plane of biotite, by a surface-bound hypha of Paxillus involutus, grown in association with the root system of a Scots pine, Pinus sylvestris. Four thin-sections were extracted by focused ion beam (FIB) milling along a single hypha grown over the biotite surface. Depth-profile of Si, O, K, Mg, Fe and Al concentrations were performed at the hypha-biotite interface by scanning transmission electron microscopy-energy dispersive X-ray spectroscopy (STEM-EDX). Large removals of K (50-65%), Mg (55-75%), Fe (80-85%) and Al (75-85%) were observed in the topmost 40 nm of biotite underneath the hypha while Si and O are preserved throughout the depth-profile. A quantitative model of alteration at the hypha-scale was developed based on solid-state diffusion fluxes of elements into the hypha and the break-down/mineralogical re-arrangement of biotite. A strong acidification was also observed with hypha bound to the biotite surface reaching pH < 4.6. When consistently compared with the abiotic biotite dissolution, we conclude that the surface-bound mycorrhiza accelerate the biotite alteration kinetics between pH 3.5 and 5.8 to similar to 0.04 mu mol biotite m(-2) h(-1). Our current work reaffirms that fungal mineral alteration is a process that combines our previously documented bio-mechanical forcing with the mu m-scale acidification mediated by surface-bound hypha and a subsequent chemical element removal due to the fungal action. As such, our study presents a first kinetic framework for mycorrhizal alteration at the hypha-scale under close-to-natural experimental conditions. (C) 2011 Elsevier Ltd. All rights reserved.