干旱区生态环境知识资源中心(Arid): Unraveling biogeochemical phosphorus dynamics in hyperarid Mars-analogue soils using stable oxygen isotopes in phosphate

Arid

DOI	10.1111/gbi.12408
	Unraveling biogeochemical phosphorus dynamics in hyperarid Mars-analogue soils using stable oxygen isotopes in phosphate
	Shen, Jianxun; Smith, Andrew C.; Claire, Mark W.; Zerkle, Aubrey L.
通讯作者	Shen, JX
来源期刊	GEOBIOLOGY
ISSN	1472-4677
EISSN	1472-4669
出版年	2020
卷号	18 期号:6 页码:760-779
英文摘要	With annual precipitation less than 20 mm and extreme UV intensity, the Atacama Desert in northern Chile has long been utilized as an analogue for recent Mars. In these hyperarid environments, water and biomass are extremely limited, and thus, it becomes difficult to generate a full picture of biogeochemical phosphate-water dynamics. To address this problem, we sampled soils from five Atacama study sites and conducted three main analyses-stable oxygen isotopes in phosphate, enzyme pathway predictions, and cell culture experiments. We found that high sedimentation rates decrease the relative size of the organic phosphorus pool, which appears to hinder extremophiles. Phosphoenzyme and pathway prediction analyses imply that inorganic pyrophosphatase is the most likely catalytic agent to cycle P in these environments, and this process will rapidly overtake other P utilization strategies. In these soils, the biogenic delta O-18 signatures of the soil phosphate (delta O-18(PO4)) can slowly overprint lithogenic delta(18)O(PO4)values over a timescale of tens to hundreds of millions of years when annual precipitation is more than 10 mm. The delta(18)O(PO4)of calcium-bound phosphate minerals seems to preserve the delta O-18 signature of the water used for biogeochemical P cycling, pointing toward sporadic rainfall and gypsum hydration water as key moisture sources. Where precipitation is less than 2 mm, biological cycling is restricted and bedrock delta(18)O(PO4)values are preserved. This study demonstrates the utility of delta(18)O(PO4)values as indicative of biogeochemical cycling and hydrodynamics in an extremely dry Mars-analogue environment.
英文关键词	biosignature hyperarid Mars metabolic pathway phosphate stable oxygen isotope
类型	Article
语种	英语
开放获取类型	Green Accepted, Green Published
收录类别	SCI-E
WOS记录号	WOS:000561184300001
WOS关键词	ATACAMA DESERT ; AVAILABLE PHOSPHATE ; METABOLIC PATHWAYS ; MICROBIAL BIOMASS ; BIOGENIC APATITES ; METACYC DATABASE ; WATER ; RATIOS ; GROUNDWATER ; ARIDITY
WOS类目	Biology ; Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Life Sciences & Biomedicine - Other Topics ; Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325723
作者单位	[Shen, Jianxun; Claire, Mark W.; Zerkle, Aubrey L.] Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9AL, Fife, Scotland; [Shen, Jianxun; Claire, Mark W.; Zerkle, Aubrey L.] Univ St Andrews, Ctr Exoplanet Sci, St Andrews KY16 9AL, Fife, Scotland; [Smith, Andrew C.] British Geol Survey, NERC Isotope Geosci Facil, Nottingham, England
推荐引用方式 GB/T 7714	Shen, Jianxun,Smith, Andrew C.,Claire, Mark W.,et al. Unraveling biogeochemical phosphorus dynamics in hyperarid Mars-analogue soils using stable oxygen isotopes in phosphate[J],2020,18(6):760-779.
APA	Shen, Jianxun,Smith, Andrew C.,Claire, Mark W.,&Zerkle, Aubrey L..(2020).Unraveling biogeochemical phosphorus dynamics in hyperarid Mars-analogue soils using stable oxygen isotopes in phosphate.GEOBIOLOGY,18(6),760-779.
MLA	Shen, Jianxun,et al."Unraveling biogeochemical phosphorus dynamics in hyperarid Mars-analogue soils using stable oxygen isotopes in phosphate".GEOBIOLOGY 18.6(2020):760-779.