干旱区生态环境知识资源中心(Arid): Nitrates as a Potential N Supply for Microbial Ecosystems in a Hyperarid Mars Analog System

Arid

DOI	10.3390/life9040079
	Nitrates as a Potential N Supply for Microbial Ecosystems in a Hyperarid Mars Analog System
	Shen, Jianxun 1; Zerkle, Aubrey L.; Stueeken, Eva ; Claire, Mark W.
通讯作者	Shen, Jianxun
来源期刊	LIFE-BASEL
EISSN	2075-1729
出版年	2019
卷号	9 期号:4
英文摘要	Nitrate is common in Mars sediments owing to long-term atmospheric photolysis, oxidation, and potentially, impact shock heating. The Atacama Desert in Chile, which is the driest region on Earth and rich in nitrate deposits, is used as a Mars analog in this study to explore the potential effects of high nitrate levels on growth of extremophilic ecosystems. Seven study sites sampled across an aridity gradient in the Atacama Desert were categorized into 3 clusters-hyperarid, middle, and arid sites-as defined by essential soil physical and chemical properties. Intriguingly, the distribution of nitrate concentrations in the shallow subsurface suggests that the buildup of nitrate is not solely controlled by precipitation. Correlations of nitrate with SiO2/Al2O3 and grain sizes suggest that sedimentation rates may also be important in controlling nitrate distribution. At arid sites receiving more than 10 mm/yr precipitation, rainfall shows a stronger impact on biomass than nitrate does. However, high nitrate to organic carbon ratios are generally beneficial to N assimilation, as evidenced both by soil geochemistry and enriched culturing experiments. This study suggests that even in the absence of precipitation, nitrate levels on a more recent, hyperarid Mars could be sufficiently high to benefit potentially extant Martian microorganisms.
英文关键词	nitrate Mars Atacama Desert sedimentation rates biomass preservation extremophiles
类型	Article
语种	英语
国家	Scotland
开放获取类型	Green Published, gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000505571000008
WOS关键词	ATACAMA DESERT ; NITROGEN-CYCLE ; GALE CRATER ; EVOLUTION ; SEDIMENTATION ; OXYGEN ; IMPACT ; CHILE ; WATER ; CORE
WOS类目	Biology ; Microbiology
WOS研究方向	Life Sciences & Biomedicine - Other Topics ; Microbiology
EI主题词	2019-12-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311091
作者单位	1.Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9AL, Fife, Scotland; 2.Univ St Andrews, Ctr Exoplanet Sci, St Andrews KY16 9AL, Fife, Scotland
推荐引用方式 GB/T 7714	Shen, Jianxun,Zerkle, Aubrey L.,Stueeken, Eva,et al. Nitrates as a Potential N Supply for Microbial Ecosystems in a Hyperarid Mars Analog System[J],2019,9(4).
APA	Shen, Jianxun,Zerkle, Aubrey L.,Stueeken, Eva,&Claire, Mark W..(2019).Nitrates as a Potential N Supply for Microbial Ecosystems in a Hyperarid Mars Analog System.LIFE-BASEL,9(4).
MLA	Shen, Jianxun,et al."Nitrates as a Potential N Supply for Microbial Ecosystems in a Hyperarid Mars Analog System".LIFE-BASEL 9.4(2019).