Cosmogenic in situ 14 C- 10 Be reveals abrupt Late Holocene soil loss in the Andean Altiplano.

Autor: Hippe K; Laboratory of Ion Beam Physics, ETH Zürich, Zürich, Switzerland. hippe.kristina@gmail.com.; Institute of Geological Sciences, Freie Universität Berlin, Berlin, Germany. hippe.kristina@gmail.com., Jansen JD; GFÚ Institute of Geophysics, Czech Academy of Sciences, Prague, Czechia., Skov DS; Department of Geoscience, Aarhus University, Aarhus, Denmark., Lupker M; Geological Institute, ETH Zürich, Zürich, Switzerland., Ivy-Ochs S; Laboratory of Ion Beam Physics, ETH Zürich, Zürich, Switzerland., Kober F; National Cooperative for the Disposal of Radioactive Waste (NAGRA), Wettingen, Switzerland., Zeilinger G; Institute of Geosciences, University of Potsdam, Potsdam, Germany., Capriles JM; Department of Anthropology, Pennsylvania State University, State College, USA., Christl M; Laboratory of Ion Beam Physics, ETH Zürich, Zürich, Switzerland., Maden C; Institute of Geochemistry and Petrology, ETH Zürich, Zürich, Switzerland., Vockenhuber C; Laboratory of Ion Beam Physics, ETH Zürich, Zürich, Switzerland., Egholm DL; Department of Geoscience, Aarhus University, Aarhus, Denmark.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2021 May 05; Vol. 12 (1), pp. 2546. Date of Electronic Publication: 2021 May 05.
DOI: 10.1038/s41467-021-22825-6
Abstrakt: Soil sustainability is reflected in a long-term balance between soil production and erosion for a given climate and geology. Here we evaluate soil sustainability in the Andean Altiplano where accelerated erosion has been linked to wetter climate from 4.5 ka and the rise of Neolithic agropastoralism in the millennium that followed. We measure in situ cosmogenic 14 C directly on cultivated hilltops to quantify late Holocene soil loss, which we compare with background soil production rates determined from cosmogenic 26 Al and 10 Be. Our Monte Carlo-based inversion method identifies two scenarios to account for our data: an increase in erosion rate by 1-2 orders of magnitude between ~2.6 and 1.1 ka, or a discrete event stripping ~1-2 m of soil between ~1.9 and 1.1 ka. Coupled environmental and cultural factors in the Late Holocene signaled the onset of the pervasive human imprint in the Andean Altiplano seen today.
Databáze: MEDLINE
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