Rock weathering creates oases of life in a High Arctic desert

Sara Borin, Stefano Ventura, Fulvia Tambone, Francesca Mapelli, Florence Schubotz, Lorenzo Brusetti, Barbara Scaglia, Luigi P. D'Acqui, Bjørn Solheim, Silvia Turicchia, Ramona Marasco, Kai Uwe Hinrichs, Franco Baldi, Fabrizio Adani, Daniele Daffonchio*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

During primary colonization of rock substrates by plants, mineral weathering is strongly accelerated under plant roots, but little is known on how it affects soil ecosystem development before plant establishment. Here we show that rock mineral weathering mediated by chemolithoautotrophic bacteria is associated to plant community formation in sites recently released by permanent glacier ice cover in the Midtre Lovénbreen glacier moraine (78°53′N), Svalbard. Increased soil fertility fosters growth of prokaryotes and plants at the boundary between sites of intense bacterial mediated chemolithotrophic iron-sulfur oxidation and pH decrease, and the common moraine substrate where carbon and nitrogen are fixed by cyanobacteria. Microbial iron oxidizing activity determines acidity and corresponding fertility gradients, where water retention, cation exchange capacity and nutrient availability are increased. This fertilization is enabled by abundant mineral nutrients and reduced forms of iron and sulfur in pyrite minerals within a conglomerate type of moraine rock. Such an interaction between microorganisms and moraine minerals determines a peculiar, not yet described model for soil genesis and plant ecosystem formation with potential past and present analogues in other harsh environments with similar geochemical settings.

Original languageEnglish (US)
Pages (from-to)293-303
Number of pages11
JournalEnvironmental Microbiology
Volume12
Issue number2
DOIs
StatePublished - Feb 1 2010

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

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