Carbon accrual in the Atacama Desert

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Title:Main Title: Carbon accrual in the Atacama Desert
Description:Abstract: The Atacama Desert is the oldest and driest Desert on Earth. Nevertheless, traces of life as well as soil formation have been observed in several places. Until now a few studies exist which showed that organic matter occurs in the top sediments of the hyper arid desert, predominantly in protected environments (e.g. under quartz stones) where they build small voids of life. Though it is questionable if also the subsoil represents an attractive environment to shelter different forms of organic matter. The aim of our study is to evaluate the heterogeneity in lateral and vertical distribution of soil organic carbon (SOC) with regard to quality and quantity. Therefore, we analyzed inventories of SOC stocks and amended them by biomarker analyses. We hypothesize that there is a pronounced accumulation of SOC in form of hotspots in the topsoil and in the subsoil, where the latter forms a protected and undiscovered archive of life. Therefore, within a replicated aridity gradient top and subsoil samples were taken to account for heterogeneity in SOC distribution. Additionally, we endeavor to ascertain the reason for SOC hotspots by Alkane, Lignin and Amino sugar analyses. Our results revealed that with decreasing aridity, SOC ranged from 0.087±0.00 to 3.42±4.08 kg m-2 in the topsoil, and from 0.07±0.00 to 0.24±0.07 kg m-2 in depth profiles of hyper-arid to arid ecosystems. C stocks increased with precipitation and subsoil hotspots of SOC accrual were found between 40 and 150 cm confirming the presence of a cryptic habitat for buried organic matter. The more hyper-arid the conditions, the more carbon is stored in form of hotspots in deeper horizons. Therefore we appeal to reconsider the present state of the art, which assumes most SOC to be stored in the topsoil.
Responsible Party
Creators:Ramona Mörchen (Author), Eva Lehndorff (Author), Ghazal Moradi (Author), Franko Arenas-Díaz (Author), Barbara Fuentes (Author), Erwin Klumpp (Author), Roland Bol (Author), Wulf Amelung (Author)
Publisher:CRC1211 Database (CRC1211DB)
Publication Year:2019
Topic
CRC1211 Topic:Biology
Related Subproject:B5
Subject:Keyword: Biogeochemistry of Soils
File Details
Filename:EGUVortrag2019RM.pptx
Data Type:Event - Event
File Size:28.1 MB
Date:Available: 10.05.2019
Mime Type:application/vnd.openxmlformats-officedocument.presentationml.presentation
Data Format:MS PowerPoint
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:10th of April, 2019
Presentation Type:Talk
Event:EGU Vienna 2019
Event Type:Conference
Event Location:Vienna, Austria
Event Duration:8th of April, 2019 - 12th of April, 2019
Metadata Details
Metadata Creator:Ramona Mörchen
Metadata Created:10.05.2019
Metadata Last Updated:10.05.2019
Subproject:B5
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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