干旱区生态环境知识资源中心(Arid): Cyanobacterial weathering in warming periglacial sediments: Implications for nutrient cycling and potential biosignatures

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DOI	10.1002/ppp.2133
	Cyanobacterial weathering in warming periglacial sediments: Implications for nutrient cycling and potential biosignatures
	Demirel-Floyd, Cansu; Soreghan, Gerilyn S.; Madden, Megan E. Elwood
通讯作者	Demirel-Floyd, C (corresponding author), Univ Oklahoma, Sch Geosci, 100 E Boyd St, Norman, OK 73019 USA.
来源期刊	PERMAFROST AND PERIGLACIAL PROCESSES
ISSN	1045-6740
EISSN	1099-1530
出版年	2022
英文摘要	The cryosphere hosts a widespread microbial community, yet microbial influences on silicate weathering have been historically neglected in cold-arid deserts. Here we investigate bioweathering by a cold-tolerant cyanobacteria (Leptolyngbya glacialis) via laboratory experiments using glaciofluvial drift sediments at 12 degrees C, analogous to predicted future permafrost surface temperatures. Our results show threefold enhanced Si weathering rates in pre-weathered, mixed-lithology Antarctic biotic reactors compared to abiotic controls, indicating the significant influence of microbial life on weathering. Although biotic and abiotic weathering rates are similar in Icelandic sediments, neo-formed clay and Fe-(oxy)hydroxide minerals observed in association with biofilms in biotic reactors are common on Icelandic mafic minerals, similar to features observed in unprocessed Antarctic drifts. This suggests that microbes enhance weathering in systems where they must scavenge for nutrients that are not easily liberated via abiotic pathways; potential biosignatures may form in nutrient-rich systems as well. In both sediment types we also observed up to fourfold higher bicarbonate concentrations in biotic reactors relative to abiotic reactors, indicating that, as warming occurs, psychrotolerant biota will enhance bicarbonate flux to the oceans, thus stimulating carbonate deposition and providing a negative feedback to increasing atmospheric CO2.
英文关键词	Antarctic dry valleys biosignature cyanobacteria glacial Mars silicate weathering
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000715072100001
WOS关键词	BET SURFACE-AREA ; ROSS SEA REGION ; TRANSANTARCTIC MOUNTAINS ; MICROBIAL ECOSYSTEMS ; STREAM SEDIMENTS ; VICTORIA LAND ; DIVERSITY ; SOILS ; ICE ; PERMAFROST
WOS类目	Geography, Physical ; Geology
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/367700
作者单位	[Demirel-Floyd, Cansu; Soreghan, Gerilyn S.; Madden, Megan E. Elwood] Univ Oklahoma, Sch Geosci, 100 E Boyd St, Norman, OK 73019 USA
推荐引用方式 GB/T 7714	Demirel-Floyd, Cansu,Soreghan, Gerilyn S.,Madden, Megan E. Elwood. Cyanobacterial weathering in warming periglacial sediments: Implications for nutrient cycling and potential biosignatures[J],2022.
APA	Demirel-Floyd, Cansu,Soreghan, Gerilyn S.,&Madden, Megan E. Elwood.(2022).Cyanobacterial weathering in warming periglacial sediments: Implications for nutrient cycling and potential biosignatures.PERMAFROST AND PERIGLACIAL PROCESSES.
MLA	Demirel-Floyd, Cansu,et al."Cyanobacterial weathering in warming periglacial sediments: Implications for nutrient cycling and potential biosignatures".PERMAFROST AND PERIGLACIAL PROCESSES (2022).