气候变化领域集成服务门户(CCPortal): Temporal variation of bacterial community and nutrients in Tibetan glacier snowpack

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DOI	10.5194/tc-16-1265-2022
	Temporal variation of bacterial community and nutrients in Tibetan glacier snowpack
	Chen, Yuying; Liu, Keshao; Liu, Yongqin; Vick-Majors, Trista J.; Wang, Feng; Ji, Mukan
通讯作者	Ji, MK (通讯作者)
发表日期	2022
ISSN	1994-0416
EISSN	1994-0424
起始页码	1265
结束页码	1280
卷号	16 期号:4
英文摘要	The Tibetan Plateau harbors the largest number of glaciers outside the polar regions, which are the source of several major rivers in Asia. These glaciers are also major sources of nutrients for downstream ecosystems, while there is a little amount of data available on the nutrient transformation processes on the glacier surface. Here, we monitored the carbon and nitrogen concentration changes in a snowpit following a snowfall in the Dunde Glacier of the Tibetan Plateau. The association of carbon and nitrogen changes with bacterial community dynamics was investigated in the surface and subsurface snow (depth at 0-15 and 15-30 cm, respectively) during a 9 d period. Our results revealed rapid temporal changes in nitrogen (including nitrate and ammonium) and bacterial communities in both surface and subsurface snow. Nitrate and ammonium concentrations increased from 0.44 to 1.15 mg L-1 and 0.18 to 0.24 mg L-1 in the surface snow and decreased from 3.81 to 1.04 and 0.53 to 0.25 mg L-1 in the subsurface snow over time. Therefore, we suggest that the surface snow is not nitrogen-limited, while the subsurface snow is associated with nitrogen consumption processes and is nitrogen-limited. The nitrate concentration co-varied with bacterial diversity, community structure, and the predicted nitrogen fixation and nitrogen assimilation/denitrification-related genes (narG), suggesting nitrogen could mediate bacterial community changes. The nitrogen limitation and enriched denitrification-related genes in subsurface snow suggested stronger environmental and biotic filtering than those in surface snow, which may explain the lower bacterial diversity, more pronounced community temporal changes, and stronger biotic interactions. Collectively, these findings advance our understanding of bacterial community variations and bacterial interactions after snow deposition and provide a possible biological explanation for nitrogen dynamics in snow.
关键词	INORGANIC NITROGEN ORGANIC-CARBON SURFACE MICROORGANISMS DIVERSITY LINKAGES DYNAMICS BIOMASS EXPORT
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000780105300001
来源期刊	CRYOSPHERE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260668
推荐引用方式 GB/T 7714	Chen, Yuying,Liu, Keshao,Liu, Yongqin,et al. Temporal variation of bacterial community and nutrients in Tibetan glacier snowpack[J]. 中国科学院青藏高原研究所,2022,16(4).
APA	Chen, Yuying,Liu, Keshao,Liu, Yongqin,Vick-Majors, Trista J.,Wang, Feng,&Ji, Mukan.(2022).Temporal variation of bacterial community and nutrients in Tibetan glacier snowpack.CRYOSPHERE,16(4).
MLA	Chen, Yuying,et al."Temporal variation of bacterial community and nutrients in Tibetan glacier snowpack".CRYOSPHERE 16.4(2022).