干旱区生态环境知识资源中心(Arid): Tracing elevational changes in microbial life and organic carbon sources in soils of the Atacama Desert

Arid

DOI	10.1016/j.gloplacha.2019.103078
	Tracing elevational changes in microbial life and organic carbon sources in soils of the Atacama Desert
	Knief, Claudia 1; Bol, Roland 2; Amelung, Wulf 3; Kusch, Stephanie 4; Frindte, Katharina 1; Eckmeier, Eileen 5,8; Jaeschke, Andrea 4; Dunai, Tibor 4; Fuentes, Barbara 6; Moerchen, Ramona 3; Schuette, Tanja 1; Luecke, Andreas 2; Klumpp, Erwin 2; Kaiser, Klaus 7; Rethemeyer, Janet 4
通讯作者	Knief, Claudia
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2020
卷号	184
英文摘要	The Atacama Desert frequently serves as model system for tracing life under extremely dry conditions. We hypothesized that traces of life in the Atacama Desert follow distinct micro- and macro-scale gradients such as soil depth and elevation, respectively. Different depth intervals of surface soils (0-1, 1-5, and 5-10 cm) were sampled at five sites along an elevational transect near the Quebrada Aroma, spanning from the hyperarid core of the desert towards the arid Western Andean Precordillera (1300 to 2700 m a.s.l.), and from one additional site in the hyperarid core near Yungay. We determined the contents of major elements, pedogenic minerals and oxides, organic carbon (OC), and its delta C-13 and delta N-15 isotopic composition. The presence of living microorganisms was assessed by cultivation, and bacterial community composition was analyzed based on 16S rRNA gene sequencing. Additional information about past and present plant and microbial life was obtained from lipid biomarker analysis. We did not detect consistent micro-scale distributions for most of these proxies within the soils. However, concentrations of OC and of long-chain, plant wax-derived n-alkanes increased in soils along the aridity gradient towards the wetter sites, indicating the presence of past life at places presently not covered by vegetation. Likewise, bacterial abundance and diversity decreased as hyperaridity increased and the microbial community composition changed along the transect, becoming enriched in Actinobacteria. The distributional patterns of phospholipid fatty acids (PLFAs) confirmed the larger bacterial diversity at the higher, more humid sites compared to the drier ones. Archaeal isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs) and bacterial branched (br)GDGTs, which can also indicate past life, did not follow a clear elevational trend and were absent at the driest site. Taken together, plant-derived and microbiological markers follow primarily the macro scaled elevation and aridity gradient. Viable bacteria are present even at the driest sites, while detected biomolecules also indicate past life. The detection of past plant life in nowadays apparently lifeless regions suggests that conditions for life were less hostile in former times.
英文关键词	Hyperarid Desert soil PLFA Organic carbon Bacterial diversity GDGT Elevation Transect
类型	Article
语种	英语
国家	Germany ; Chile
收录类别	SCI-E
WOS记录号	WOS:000508491500030
WOS关键词	HYPERARID MARGIN ; COASTAL DESERT ; CLIMATE-CHANGE ; ARID SOILS ; COMMUNITIES ; DIVERSITY ; DELTA-N-15 ; INSIGHTS ; TIME ; ABUNDANCE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
EI主题词	2020-01-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312300
作者单位	1.Univ Bonn, Inst Crop Sci & Resource Conservat, Mol Biol Rhizosphere, D-53115 Bonn, Germany; 2.Forschungszentrum Julich, Agrosphere Inst IBG 3, Inst Bio & Geosci, D-52425 Julich, Germany; 3.Univ Bonn, Inst Crop Sci & Resource Conservat Soil Sci & Soi, D-53115 Bonn, Germany; 4.Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany; 5.Rhein Westfal TH Aachen, Dept Geog, D-52056 Aachen, Germany; 6.Univ Catolica Norte, Dept Ingn Quim, Antofagasta, Chile; 7.Martin Luther Univ Halle Wittenberg, Soil Sci, D-06120 Halle, Saale, Germany; 8.Ludwig Maximilians Univ Munchen, Dept Geog, D-80333 Munich, Germany
推荐引用方式 GB/T 7714	Knief, Claudia,Bol, Roland,Amelung, Wulf,et al. Tracing elevational changes in microbial life and organic carbon sources in soils of the Atacama Desert[J],2020,184.
APA	Knief, Claudia.,Bol, Roland.,Amelung, Wulf.,Kusch, Stephanie.,Frindte, Katharina.,...&Rethemeyer, Janet.(2020).Tracing elevational changes in microbial life and organic carbon sources in soils of the Atacama Desert.GLOBAL AND PLANETARY CHANGE,184.
MLA	Knief, Claudia,et al."Tracing elevational changes in microbial life and organic carbon sources in soils of the Atacama Desert".GLOBAL AND PLANETARY CHANGE 184(2020).