期刊
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
卷 56, 期 1, 页码 17-27出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2004.11.006
关键词
epilithic lichens; serpentinized ultramafic rocks; alpine environment; weathering
The effects of biogeophysical and biogeochemical weathering generated by the epilithic lichen species Sporastatia testudinea (Ach.) A. Massal., Lecidea atrobrunnea (Lam. and DC.) Schaer. and Rhizocarpon geographicum gr. on antigorite serpentinites were examined with a petrographic and lichenological approach. Lithotype structure and mineral composition are decisive factors in modulating hyphal penetration which invades up to 2 mm in depth. A microcrystalline fraction composed of fragments of the colonized substratum (antigorite, magnetite, diopside), neoformation minerals typical of serpentine soils (illite, halloysite, vermiculite) and biomineralization products (mainly oxalates), constantly found at the lichen-rock interface, underlines the important role of these crustose lichen species in the pedogenetic processes. (c) 2005 Published by Elsevier Ltd.
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