Key processes and timescales of tropical earth formation
Sprafke, Tobias (University of Bern)
Kadereit, Annette (Heidelberg University)
Lauer, Felix (University of Melbourne)
Rodrigues, Fernanda Costa G. (University of São Paulo)
Sawakuchi, André Oliveira (University of São Paulo)
Thiel, Christine (Federal Institute for Geosciences and Natural Resources)
Van Thuyne, John (University of Lausanne)
Rodrigues, Leonor (Agroscope)
Santos, Taís Almeida (University of São Paulo)
Zipf, Lars (Université Libre de Bruxelles)
Szidat, Sönke (University of Bern)
Tchomga, Philippe (Institut Universitaire Agricole de Management des Métiers de la Production (Camerun))
Ndjigui, Paul-Desire (University of Yaoundé I)
Lombardo, Umberto (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Vidal-Torrado, Pablo (Luiz de Queiroz Agriculture College)
Veit, Heinz (University of Bern)
Universitat Autònoma de Barcelona. Departament de Prehistòria

Data:	2024
Descripció:	17 pàg.
Resum:	Understanding the formation of tropical yellow to red earth (TYRE) is essential for preserving soil multifunctionality in well-drained tropical landscapes. Weathering and bioturbation mutually interact in TYRE evolution, whereas allochthonous materials appear restricted to distinct (paleo)landscapes. A layered appearance of TYRE can result from quasi-constant deposition of invertebrate mound debris, outcompeting diffusional mixing. Age-depth profiles from optically stimulated luminescence (OSL) and charcoal radiocarbon (14Cchar) data of TYRE sites in different tropical landscapes, both from the literature and the present study, all reveal quasi-constant soil upbuilding, in accordance with our model. The rates of soil upbuilding are mostly in the range of 100-200 mm*ka−1, which conforms with published mounding rates of termites and ants. By comparison, geochemical transformation of rock to saprolite proceeds at rates at least one order of magnitude smaller. Termites mining saprolite, sometimes even below indurated subsoil, produce TYRE, thus linking the interconnected subsystems of differing process rates. The work of the bioengineers appears essential for transforming the deep-weathering products into well-structured TYRE. Future research may extend the provided database, the spatial scale, and the use of geochronology, coupled with paleoenvironmental proxies, in order to further enhance our understanding of tropical soil and landscape evolution, as one basis for advances in sustainable land use.
Nota:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Bioturbation ; Landscape evolution ; Sustainable land use ; Tropical soil ; Weathering rates
Publicat a:	Earth-science reviews, Vol. 254 (July 2024) , art. 104804, ISSN 1872-6828

DOI: 10.1016/j.earscirev.2024.104804

17 p, 6.1 MB

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