气候变化领域集成服务门户(CCPortal): Spatially varying peatland initiation; Holocene development; carbon accumulation patterns and radiative forcing within a subarctic fen

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DOI	10.1016/j.quascirev.2020.106596
	Spatially varying peatland initiation; Holocene development; carbon accumulation patterns and radiative forcing within a subarctic fen
	Piilo S.R.; Korhola A.; Heiskanen L.; Tuovinen J.-P.; Aurela M.; Juutinen S.; Marttila H.; Saari M.; Tuittila E.-S.; Turunen J.; Väliranta M.M.
发表日期	2020
ISSN	0277-3791
卷号	248
英文摘要	High latitude peatlands act as globally important carbon (C) sinks and are in constant interaction with the atmosphere. Their C storage formed during the Holocene. In the course of time, the aggregate effect of the C fluxes on radiative forcing (RF) typically changes from warming to cooling, but the timing of this shift varies among different peatlands. Here we investigated Holocene peatland development, including vegetation history, vertical peat growth and the lateral expansion of a patterned subarctic fen in northern Finland by means of multiple sampling points. We modelled the Holocene RF by combining knowledge on past vegetation communities based on plant macrofossil stratigraphies and present in situ C flux measurements. The peatland initiated at ca. 9500 calibrated years Before Present (cal yr BP), and its lateral expansion was greatest between ca. 9000 and 7000 cal yr BP. After the early expansion, vertical peat growth proceeded very differently in different parts of the peatland, regulated by internal and external factors. The pronounced surface microtopography, with high strings and wet flarks, started to form only after ca. 1000 cal yr BP. C accumulation within the peatland recorded a high degree of spatial variability throughout its history, including the recent past. We applied two flux scenarios with different interpretation of the initial peatland development phases to estimate the RF induced by C fluxes of the fen. After ca. 4000 cal yr BP, at the latest, the peatland RF has been negative (cooling), mainly driven by C uptake and biomass production, while methane emissions had a lesser role in the total RF. Interestingly, these scenarios suggest that the greatest cooling effect took place around ca. 1000 cal yr BP, after which the surface microtopography established. The study demonstrated that despite the high spatial heterogeneity and idiosyncratic behaviour of the peatland, the RF of the studied fen followed the general development pattern of more southern peatlands. Holocene climate variations and warm phases did not seem to induce any distinctive and consistent peatland-scale patterns in C accumulation, whereas our data suggests that the changes in vegetation related to autogenic succession were reflected in the C accumulation patterns and RF more clearly. © 2020 Elsevier Ltd
英文关键词	Aapa mire; Autogenic succession; Carbon dynamics; Climate variation; High latitudes; Lateral expansion; Paleoecology; Vegetation dynamics
语种	英语
scopus关键词	Atmospheric radiation; Carbon; Digital storage; Expansion; Peat; Vegetation; Biomass productions; Development patterns; Internal and external factors; Peatland development; Spatial heterogeneity; Spatial variability; Surface microtopography; Vegetation community; Wetlands; carbon sequestration; climate variation; cooling; expansion; fen; Holocene; peatland; radiative forcing; soil aggregate; soil carbon; subarctic region; Finland
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151267
作者单位	ECRU, Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. Box 6500014, Finland; Helsinki Institute of Sustainability Science (HELSUS), Finland; Finnish Meteorological Institute, Erik Palménin Aukio 1, Helsinki, 00560, Finland; Water, Energy and Environmental Engineering Research Unit,University of Oulu, P.O. Box 430090014, Finland; School of Forest Sciences, University of Eastern Finland, P.O. Box 111, Joensuu, Finland; Environmental Solutions, Peatland Use and Resource Economics, Geological Survey of Finland, P.O. Box 96, Espoo, 02151, Finland
推荐引用方式 GB/T 7714	Piilo S.R.,Korhola A.,Heiskanen L.,et al. Spatially varying peatland initiation; Holocene development; carbon accumulation patterns and radiative forcing within a subarctic fen[J],2020,248.
APA	Piilo S.R..,Korhola A..,Heiskanen L..,Tuovinen J.-P..,Aurela M..,...&Väliranta M.M..(2020).Spatially varying peatland initiation; Holocene development; carbon accumulation patterns and radiative forcing within a subarctic fen.Quaternary Science Reviews,248.
MLA	Piilo S.R.,et al."Spatially varying peatland initiation; Holocene development; carbon accumulation patterns and radiative forcing within a subarctic fen".Quaternary Science Reviews 248(2020).