Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Chemistry and microbiology of the Critical Zone along a steep climate and vegetation gradient in the Chilean Coastal Cordillera

Title data

Oeser, Ralf A. ; Stroncik, Nicole ; Moskwa, Lisa-Marie ; Bernhard, Nadine ; Schaller, Mirjam ; Canessa, Rafaella ; van den Brink, Liesbeth ; Köster, Moritz ; Brucker, Emanuel ; Stock, Svenja ; Fuentes, Juan Pablo ; Godoy, Roberto ; Matus, Francisco Javier ; Pedraza, Rómulo Oses ; McIntyre, Pablo Osses ; Paulino, Leandro ; Seguel, Oscar ; Bader, Maaike Y. ; Boy, Jens ; Dippold, Michaela A. ; Ehlers, Todd A. ; Kühn, Peter ; Kuzyakov, Yakov ; Leinweber, Peter ; Scholten, Thomas ; Spielvogel, Sandra ; Spohn, Marie ; Übernickel, Kirstin ; Tielbörger, Katja ; Wagner, Dirk ; von Blanckenburg, Friedhelm:
Chemistry and microbiology of the Critical Zone along a steep climate and vegetation gradient in the Chilean Coastal Cordillera.
In: Catena. Vol. 170 (2018) . - 183 - 203.
ISSN 0341-8162
DOI: https://doi.org/10.1016/j.catena.2018.06.002

Abstract in another language

The Chilean Coastal Cordillera features a spectacular climate and vegetation gradient, ranging from arid and unvegetated areas in the north to humid and forested areas in the south. The EarthShape project (“Earth Surface Shaping by Biota”) uses this natural gradient to investigate how climate and biological processes shape the Earth's surface. We explored the Critical Zone, the Earth's uppermost layer, in four key sites located in desert, semidesert, Mediterranean, and temperate climate zones of the Coastal Cordillera, with the focus on weathering of granitic rock. Here, we present first results from 16 approximately 2 m-deep regolith profiles to document: (1) architecture of weathering zone; (2) degree and rate of rock weathering, thus the release of mineral-derived nutrients to the terrestrial ecosystems; (3) denudation rates; and (4) microbial abundances of bacteria and archaea in the saprolite.
From north to south, denudation rates from cosmogenic nuclides are ~10 t km⁻² yr⁻¹ at the arid Pan de Azúcar site, ~20 t km⁻² yr⁻¹ at the semi-arid site of Santa Gracia, ~60 t km⁻² yr⁻¹ at the Mediterranean climate site of La Campana, and ~30 t km⁻² yr⁻¹ at the humid site of Nahuelbuta. A and B horizons increase in thickness and elemental depletion or enrichment increases from north (~26°S) to south (~38°S) in these horizons. Differences in the degree of chemical weathering, quantified by the chemical depletion fraction (CDF), are significant only between the arid and sparsely vegetated site and the other three sites. Differences in the CDF between the sites, and elemental depletion within the sites are sometimes smaller than the variations induced by the bedrock heterogeneity. Microbial abundances (bacteria and archaea) in saprolite substantially increase from the arid to the semi-arid sites.
With this study, we provide a comprehensive dataset characterizing the Critical Zone geochemistry in the Chilean Coastal Cordillera. This dataset confirms climatic controls on weathering and denudation rates and provides prerequisites to quantify the role of biota in future studies.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER146458
Keywords: Weathering; Denudation; Microbial abundance; Climate; Chile
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology > Lehrstuhl Bodenökologie - Univ.-Prof. Dr. Eva Lehndorff
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Apr 2019 13:56
Last Modified: 03 Apr 2019 13:56
URI: https://eref.uni-bayreuth.de/id/eprint/48552