气候变化领域集成服务门户(CCPortal): Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes

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DOI	10.1007/s10533-021-00820-9
	Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes
	Rantala M.V.; Meyer-Jacob C.; Kivilä E.H.; Luoto T.P.; Ojala A.E.K.; Smol J.P.; Nevalainen L.
发表日期	2021
ISSN	1682563
英文摘要	Global environmental change alters the production, terrestrial export, and photodegradation of organic carbon in northern lakes. Sedimentary biogeochemical records can provide a unique means to understand the nature of these changes over long time scales, where observational data fall short. We deployed in situ experiments on two shallow subarctic lakes with contrasting light regimes; a clear tundra lake and a dark woodland lake, to first investigate the photochemical transformation of carbon and nitrogen elemental (C/N ratio) and isotope (δ13C, δ15N) composition in lake water particulate organic matter (POM) for downcore inferences. We then explored elemental, isotopic, and spectral (inferred lake water total organic carbon [TOC] and sediment chlorophyll a [CHLa]) fingerprints in the lake sediments to trace changes in aquatic production, terrestrial inputs and photodegradation before and after profound human impacts on the global carbon cycle prompted by industrialization. POM pool in both lakes displayed tentative evidence of UV photoreactivity, reflected as increasing δ13C and decreasing C/N values. Through time, the tundra lake sediments traced subtle shifts in primary production, while the woodland lake carried signals of changing terrestrial contributions, indicating shifts in terrestrial carbon export but possibly also photodegradation rates. Under global human impact, both lakes irrespective of their distinct carbon regimes displayed evidence of increased productivity but no conspicuous signs of increased terrestrial influence. Overall, sediment biogeochemistry can integrate a wealth of information on carbon regulation in northern lakes, while our results also point to the importance of considering the entire spectrum of photobiogeochemical fingerprints in sedimentary studies. © 2021, The Author(s).
英文关键词	Global change; Paleo-optics; Particulate organic matter; Photobiodegradation; Sediment biogeochemistry; Subarctic
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184639
作者单位	Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Lahti, Finland; CNR Water Research Institute (IRSA), Unit Verbania, Verbania, Italy; Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen’s University, Kingston, ON, Canada; Aquatic Laboratory, Département Des Sciences Fondamentales, Université du Québec À Chicoutimi, Chicoutimi, QC, Canada; Geological Survey of Finland, Espoo, Finland; Department of Geography and Geology, University of Turku, Turku, Finland
推荐引用方式 GB/T 7714	Rantala M.V.,Meyer-Jacob C.,Kivilä E.H.,et al. Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes[J],2021.
APA	Rantala M.V..,Meyer-Jacob C..,Kivilä E.H..,Luoto T.P..,Ojala A.E.K..,...&Nevalainen L..(2021).Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes.Biogeochemistry.
MLA	Rantala M.V.,et al."Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes".Biogeochemistry (2021).