[387] - Fingerprint of plant life in the Atacama Desert - insights from n-alkane analyses

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Mörchen, R., Amelung, W., Giese, C., Böhnert, T., Ruhm, J., Lehndorff, E., 2020. Fingerprint of plant life in the Atacama Desert - insights from n-alkane analyses. Organic Geochemistry, 104 - 145.
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Title(s):Main Title: Fingerprint of plant life in the Atacama Desert - insights from n-alkane analyses
Description(s):Abstract: Although the Atacama is the oldest and most continuous dry desert on Earth, organic matter (OM) is ubiquitous in its surface sediments. Today, vegetation growth is restricted to the Coastal Cordillera and the Andean foothills, which are predominantly supplied by fog or rainfall. The sources of OM in topsoils of hyperarid regions and deep sediments remain an open question; therefore, we hypothesized that desert plants exhibit specific n-alkane compositions that can be traced in adjacent topsoils and assessed possible OM sources and formation processes in hyperarid regions and soil depths of desert. We determined the n-alkane signatures of plants (n = 28), of soil OM in their vicinity, of hyperarid surface sediments (n = 82), and of four depth profiles (up to 200 cm). We found that n-alkane distributions in fog-fed plants were dominated in order by nC31, nC29, nC33, and nC27 alkanes, while rain-fed plants were dominated by nC29 and nC31 alkanes. When the ratio of nC27+nC33/nC29+nC31 was applied as a ‘‘fog-to-rain n-alkane ratio”, the data in surface soils and sediments below 1200 m a.s.l. (in the west of the desert) indicated fog-influenced formation of organics, while all soils and sediments formed higher than 1200 m a.s.l. (in the center and east of the desert) archived nalkanes from plants fed by rain. Surprisingly, 75–98% of the desert’s OM was found in deep sediments, even under recent vegetation cover. Hence, our findings indicate that currently vegetation-free hyperarid regions of the Atacama Desert once varied in size depending on climate change.
Responsible Party
Creator(s):Author: Ramona Mörchen
Author: Wulf Amelung
Author: Christian Giese
Author: Tim Böhnert
Author: Jonathan Ruhm
Author: Eva Lehndorff
Funding Reference(s):Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
CRC1211 Topic:Biology
Related Sub-project(s):B5
Subject(s):CRC1211 Keywords: Biogeochemistry of Soils
File Details
File Name:Mörchenetal2020.pdf
Data Type:Data Paper
File Size:2906 kB (2.838 MB)
Date(s):Available: 2020-12-11
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyCRC1211
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
North:-no map data
Measurement Region:Northern focus area
Measurement Location:--Northern focus area--
Specific Informations - Publication
Source:Organic Geochemistry
Page Range:104 - 145
Metadata Details
Metadata Creator:Ramona Mörchen
Metadata Created:2020-12-11
Metadata Last Updated:2020-12-11
Funding Phase:1
Metadata Language:English
Metadata Version:V43
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