Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.3390/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
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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). |
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