Patches of life in the Atacama Desert - heterogeneity analyses of soil organic carbon

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Title:Main Title: Patches of life in the Atacama Desert - heterogeneity analyses of soil organic carbon
Description:Abstract: The Atacama Desert in northern Chile is the oldest and driest desert on earth, nevertheless traces of life as well as soil formation have been observed in several places (Quade et al., 2007, Valdivia-Silva et al., 2012, Fletcher et al., 2012). Until now a few studies exist which showed that in some single places organic matter occurs in the top sediments of the desert (Valdivia-Silva et al., 2012, Fletcher et al., 2012). Furthermore differences in soil properties, such as in soil carbonates, have been found depending on increasing aridity (Quade et al., 2007). We aim at analyzing soil organic carbon distribution in surface sediments in an aridity gradient in the northern and southern Atacama Desert. We hypothesize that aridity leads to reduction of organic carbon (OC) in surface sediments and to an increasing patchiness of OC distribution. We compare samples regarding vegetation abundance and diversity from two W-E tending aridity gradients (close to Paposo and Arica, respectively). Within each gradient we compare 12 sites spanning 20 to 50 km. At each site nested samples were taken in triplicate (n=18) to account for heterogeneities in soil organic carbon distribution. Statistical analyses (multiple linear regression) were used to evaluate dependencies between soil organic carbon heterogeneity and aridity, elevation, exposition, vegetation cover and diversity. For the Paposo transect, OC decreased exponentially within 5 km of the gradients from 110.7 ± 130.4 g / kg OC for arid sites (n=3) to 5,7 ± 3,2 g / kg for hyper-arid sites (n=9). In addition we found patches of soil organic carbon accumulation around single plants, revealing OC gradients of 74.4 g/kg to 38.2 g/kg on the cm-scale. This patchiness seems to be typical for soil formation in arid environments.
Responsible Party
Creators:Ramona Mörchen (Author), Ozias Hounkpatin (Author), Ghazal Moradi (Author), Erwin Klumpp (Author), Roland Bol (Author), Wulf Amelung (Author), Eva Lehndorff (Author)
Publisher:CRC1211 Database (CRC1211DB)
Publication Year:2019
Topic
CRC1211 Topic:Biology
Related Subproject:B5
Subject:Keyword: Biogeochemistry of Soils
File Details
Filename:Riooralpresentation21WCSS.pdf
Data Type:Event - Event
File Size:4.4 MB
Date:Created: 15.08.2018
Mime Type:application/pdf
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:None
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Specific Information - Presentation
Presenter:Ramona Mörchen
Presentation Date:15th of August, 2018
Presentation Type:Talk
Event:World Conference of Soil Science
Event Type:Conference
Event Location:Rio de Janeiro
Event Duration:12th of August, 2018 - 17th of August, 2018
Metadata Details
Metadata Creator:Ramona Mörchen
Metadata Created:22.06.2019
Metadata Last Updated:22.06.2019
Subproject:B5
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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