Water-dispersible colloids distribution along an alluvial fan transect in hyper-arid Atacama Desert

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Title:Main Title: Water-dispersible colloids distribution along an alluvial fan transect in hyper-arid Atacama Desert
Description:Abstract: As located in one of the oldest and driest deserts on Earth, soils in the Atacama Desert are greatly affected by atmospheric dust deposited on soil surface and the related fate of water-dispersible colloids (WDCs, <300 nm). We hypothesize that formation and content of these WDCs change with topography and age of natural soils. To highlight the processes involved, we investigated a mid-sized and gently (~5◦) sloping alluvial fan system of multi-phase evolution at 1480 m a.s.l. in the Paposo region of the hyper-arid Atacama Desert, which is considered typical for this part of the Coastal Cordillera. Sampling was done along a topographic transect in 11 pits, and assessed the distribution and composition of WDCs by means of asymmetric flow field-flow fractionation (AF4). The younger fan section (optically stimulated luminescence (OSL)-age of ~13.6 ka) exhibited a pronounced surface roughness and steep slopes. Here, WDCs from the top soils (0–1 cm) free of plants contained nearly 54 ± 7% of medium-sized colloids (MCs, 210–300 nm) with a dominance of Si and Al. The elevated concentrations of fine colloids (FC, 24–210 nm) and particularly nanocolloids (NCs, 0.6–24 nm) was shown in levelled surface soils near shrubs with predominance of organic carbon (OC) and Ca. With higher collodial OC and Ca content in soils near shrubs, more WDC-P was formed concomitantly through increased OC-Ca-P associations. Larger variations in total WDC content were detected in the surface soils of the older fan section, which was dated to ~56.4 ka. Here, the peaking NC had almost disappeared and thus MC dominated, probably reflecting re-aggregation and wind erosion over longer periods of time across a relatively smooth land surface. The WDCs and WDC-P peaked at 5–10 cm depth in the older fan section, as here a solid mineral/salt layer was present, while in the younger fan section the WDCs were more likely to be translocated from ‘permeable’ surface into deeper layers, likely reflecting leaching with occasional heavy rainfall. Overall, forms and distribution of WDCs depended on both topographic position and sediment age, thus making colloids as unique tracers of soil development processes during myriad or more years.
Identifier:10.1016/j.geoderma.2023.116650 (DOI)
Responsible Party
Creators:Xiaolei Sun (Author), Matthias May (Author), Wulf Amelung (Author), Ni Tang (Author), Dominik Brill (Author), Franko Arenas-Díaz (Author), Daniel Contreras (Author), Barbara Fuentes (Author), Roland Bol (Author), Erwin Klumpp (Author)
Publisher:Elsevier
Publication Year:2023
Topic
CRC1211 Topic:Biology
Related Subprojects:Z3, B5, C2
Subjects:Keywords: Biogeochemistry of Soils, Soil Sciences
Geogr. Information Topic:Environment
File Details
Filename:Sun_etal_Geoderma_2023.pdf
Data Type:Data Paper - Text - Article
File Size:13.3 MB
Date:Available: 13.12.2023
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Free
Download Information:This file contains the article published in Geoderma, Volume 438 (2023).
General Access and Use Conditions:According to the CRC1211DB data policy agreement. © 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/bync/4.0/).
Access Limitations:According to the CRC1211DB data policy agreement. © 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/bync/4.0/).
Licence:[Creative Commons] Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
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Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Geoderma
Source Website:https://www.sciencedirect.com/journal/geoderma
Issue:116650
Volume:438
Number of Pages:13 (1 - 13)
Metadata Details
Metadata Creator:Simon Matthias May
Metadata Created:13.12.2023
Metadata Last Updated:13.12.2023
Subproject:Z3
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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