干旱区生态环境知识资源中心(Arid): Fingerprint of plant life in the Atacama Desert

Arid

DOI	10.1016/j.orggeochem.2020.104145
	Fingerprint of plant life in the Atacama Desert - Insights from n-alkane analyses
	Moerchen, R.; Amelung, W.; Giese, C.; Boehnert, T.; Ruhm, J.; Lehndorff, E.
通讯作者	Morchen, R (corresponding author), Univ Bonn, Inst Crop Sci & Resource Conservat, Soil Sci & Soil Ecol, Nussallee 13, D-53115 Bonn, Germany.
来源期刊	ORGANIC GEOCHEMISTRY
ISSN	0146-6380
EISSN	1873-5290
出版年	2021
卷号	151
英文摘要	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 nC(31), nC(29), nC(33), and nC(27) alkanes, while rain-fed plants were dominated by nC(29) and nC(31) alkanes. When the ratio of nC(27),nC(33)/nC(29),nC(31) 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. (C) 2020 The Authors. Published by Elsevier Ltd.
英文关键词	n-Alkanes Atacama Desert Fog and rain water Hyperarid
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000611983000016
WOS关键词	COMPOUND-SPECIFIC DELTA-C-13 ; CHEMOTAXONOMIC SIGNIFICANCE ; NORTHERN CHILE ; RODENT MIDDEN ; ORGANIC GEOCHEMISTRY ; ISOTOPIC COMPOSITION ; EPICUTICULAR WAXES ; CLIMATE-CHANGE ; SOILS ; REGION
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351246
作者单位	[Moerchen, R.; Amelung, W.; Lehndorff, E.] Univ Bonn, Inst Crop Sci & Resource Conservat, Soil Sci & Soil Ecol, Nussallee 13, D-53115 Bonn, Germany; [Giese, C.] Univ Bonn, Inst Crop Sci & Resource Conservat, Agroecol & Organ Farming, Hugel 6, D-53121 Bonn, Germany; [Boehnert, T.; Ruhm, J.] Univ Bonn, Nees Inst Biodivers Plants, Meckenheimer Allee 170, D-53115 Bonn, Germany; [Lehndorff, E.] Bayreuth Univ, Soil Ecol, Dr Hans Frisch Str 1-3, D-95448 Bayreuth, Germany
推荐引用方式 GB/T 7714	Moerchen, R.,Amelung, W.,Giese, C.,et al. Fingerprint of plant life in the Atacama Desert - Insights from n-alkane analyses[J],2021,151.
APA	Moerchen, R.,Amelung, W.,Giese, C.,Boehnert, T.,Ruhm, J.,&Lehndorff, E..(2021).Fingerprint of plant life in the Atacama Desert - Insights from n-alkane analyses.ORGANIC GEOCHEMISTRY,151.
MLA	Moerchen, R.,et al."Fingerprint of plant life in the Atacama Desert - Insights from n-alkane analyses".ORGANIC GEOCHEMISTRY 151(2021).