Arid
DOI10.3390/life9040079
Nitrates as a Potential N Supply for Microbial Ecosystems in a Hyperarid Mars Analog System
Shen, Jianxun1; Zerkle, Aubrey L.; Stueeken, Eva; Claire, Mark W.
通讯作者Shen, Jianxun
来源期刊LIFE-BASEL
EISSN2075-1729
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).
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