Impact of andosolization on pedogenic Fe oxides in ferrallitic soils

Andic properties; Bambouto Mountains; Cameroon; DOM-ferrihydrite; Fe oxides; Mössbauer spectroscopy; Biogeochemistry; Biological materials; Crystalline materials; Dissolution; Grading; Hematite; Kaolinite; Organic compounds; Volcanoes; Weathering; Fe oxide; Ferrihydrites; Ssbauer spectroscopies; Soils

Abstract :

[en] The accumulation of soil organic matter (SOM), poorly crystalline Fe oxides and metal-humus complexes is a trait of non-allophanic Andosols. The process of andosolization, which may occur in ferrallitic soils with high organic matter content, can involve transformation from well crystallized Fe oxides to poorly crystallized Fe oxides and Fe-humus complexes. This study investigates such changes in pedogenic Fe mineral associations for a soil toposequence between 1500 and 2260 m altitude along the southern flank of the volcanic Bambouto Mountains, Western Cameroon. The soils consist of highly weathered material, dominated by kaolinite, gibbsite and Fe oxides, grading to Protoandic Umbrisols at high altitude, recording an increase in SOM content with increasing altitude. As revealed by selective extraction analysis, the relative amount of poorly crystalline Fe oxides is low in the Bt and Bo horizons of low-altitude pedons, as well as in deep subsurface horizons of the high-altitude pedons. In contrast, it is significantly higher in the A and Bw horizons of the high-altitude pedons, with a clear increase with increasing altitude. Mössbauer spectroscopy analysis of B horizon samples identifies goethite as the dominant Fe oxide phase in nearly all pedons, with higher hematite contents in a mid-altitude zone marked by lower annual rainfall than in other parts of the toposequence. The Mössbauer spectra also reveal the presence of dissolved organic matter (DOM)-ferrihydrite, whose abundance is greatest in the Bw horizon of the high-altitude pedons, with an increase in relative abundance with increasing altitude. The observed patterns are attributed to dissolution-reprecipitation of Fe oxides that initially formed through ferrallitic weathering of volcanic parent materials that were roughly uniform along the toposequence. At high altitude, coupled hematite dissolution and DOM-ferrihydrite formation are favoured by high organic matter contents and low pH, related to cool humid environmental conditions and their effect on the vegetation and organic matter cycling. © 2019 Elsevier B.V.

Disciplines :

Environmental sciences & ecology

Author, co-author :

Van Ranst, E.; Ghent University, Department of Geology (WE13), Gent, Belgium

Mees, F.; Royal Museum for Central Africa, Department of Geology and Mineralogy, Tervuren, Belgium

De Grave, E.; Ghent University, Department of Physics and Astronomy, Gent, Belgium

Ye, L.; Ghent University, Department of Geology (WE13), Gent, Belgium

Cornelis, Jean-Thomas ; Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes

Delvaux, B.; Université catholique de Louvain, Earth and Life Institute – Soil Science, Louvain-la-Neuve, Belgium

Language :

English

Title :

Impact of andosolization on pedogenic Fe oxides in ferrallitic soils

Publication date :

2019

Journal title :

Geoderma

ISSN :

0016-7061

eISSN :

1872-6259

Publisher :

Elsevier B.V.

Volume :

347

Pages :

244-251

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 26 June 2019

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