干旱区生态环境知识资源中心(Arid): Diatoms in Hyporheic Sediments Trace Organic Matter Retention and Processing in the McMurdo Dry Valleys, Antarctica

Arid

DOI	10.1029/2020JG006097
	Diatoms in Hyporheic Sediments Trace Organic Matter Retention and Processing in the McMurdo Dry Valleys, Antarctica
	Heindel, Ruth C.; Darling, Josh P.; Singley, Joel G.; Bergstrom, Anna J.; McKnight, Diane M.; Lukkari, Braeden M.; Welch, Kathleen A.; Gooseff, Michael N.
通讯作者	Heindel, RC (corresponding author), Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA. ; Heindel, RC (corresponding author), Kenyon Coll, Environm Studies Program, Gambier, OH 43022 USA.
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
EISSN	2169-8961
出版年	2021
卷号	126 期号:2
英文摘要	In low-nutrient streams in cold and arid ecosystems, the spiraling of autochthonous particulate organic matter (POM) may provide important nutrient subsidies downstream. Because of its lability and the spatial heterogeneity of processing in hyporheic sediments, the downstream transport and fate of autochthonous POM can be difficult to trace. In Antarctic McMurdo Dry Valley (MDV) streams, any POM retained in the hyporheic zone is expected to be derived from surface microbial mats that contain diatoms with long-lasting silica frustules. We tested whether diatom frustules can be used to trace the retention of autochthonous POM in the hyporheic zone and whether certain geomorphic locations promote this process. The accumulation of diatom frustules in hyporheic sediments, measured as biogenic silica, was correlated with loss-on-ignition organic matter and sorbed ammonium, suggesting that diatoms can be used to identify locations where POM has been retained and processed over long timescales, regardless of whether the POM remains intact. In addition, by modeling the upstream sources of hyporheic diatom assemblages, we found that POM was predominantly derived from N-fixing microbial mats of the genus Nostoc. In terms of spatial variability, we conclude that the hyporheic sediments adjacent to the stream channel that are regularly inundated by daily flood pulses are where the most POM has been retained over long timescales. Autochthonous POM is retained in hyporheic zones of low-nutrient streams beyond the MDVs, and we suggest that biogenic silica and diatom composition can be used to identify locations where this transfer is most prevalent.
英文关键词	benthic processes biogeochemical cycles processes and modeling carbon cycling groundwater surface water interactions nitrogen cycling biogenic silica diatoms hyporheic zone McMurdo Dry Valleys particulate organic matter
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000624413700016
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369024
作者单位	[Heindel, Ruth C.; Darling, Josh P.; Singley, Joel G.; Bergstrom, Anna J.; McKnight, Diane M.; Lukkari, Braeden M.; Welch, Kathleen A.; Gooseff, Michael N.] Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA; [Heindel, Ruth C.] Kenyon Coll, Environm Studies Program, Gambier, OH 43022 USA; [Darling, Josh P.; Singley, Joel G.] Univ Colorado, Environm Studies Program, Boulder, CO 80309 USA; [Bergstrom, Anna J.] Boise State Univ, Dept Geosci, Boise, ID 83725 USA
推荐引用方式 GB/T 7714	Heindel, Ruth C.,Darling, Josh P.,Singley, Joel G.,et al. Diatoms in Hyporheic Sediments Trace Organic Matter Retention and Processing in the McMurdo Dry Valleys, Antarctica[J],2021,126(2).
APA	Heindel, Ruth C..,Darling, Josh P..,Singley, Joel G..,Bergstrom, Anna J..,McKnight, Diane M..,...&Gooseff, Michael N..(2021).Diatoms in Hyporheic Sediments Trace Organic Matter Retention and Processing in the McMurdo Dry Valleys, Antarctica.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,126(2).
MLA	Heindel, Ruth C.,et al."Diatoms in Hyporheic Sediments Trace Organic Matter Retention and Processing in the McMurdo Dry Valleys, Antarctica".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 126.2(2021).