A multi-proxy reconstruction of peatland development and regional vegetation changes in subarctic NE Fennoscandia (the Republic of Karelia, Russia) during the Holocene

Babeshko, Kirill V.; Shkurko, Anna V.; Tsyganov, Andrey N.; Severova, Elena; Gałka, Mariusz; Payne, Richard J.; Mauquoy, Dmitri; Mazei, Natalia; Fatynina, Y.; Krasnova, E. D.; Saldaev, Damir; Voronov, Dmitry A.; Zazovskaya, E. P.; Mazei, Yuri

doi:10.1177/0959683620972795

Cited by 2 publications

(4 citation statements)

References 48 publications

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“…This result is counterintuitive considering the species' climatic preferences. However, early arrival of Picea abies has also been recorded in other lakes and bogs in Karelia, to the southeast of our study area (Babeshko et al, 2021; Soloviena & Jones, 2002). The difference in timing could also be the consequence of a reservoir effect on radiocarbon dates (Björck et al, 1998; Grimm et al, 2009).…”

Section: Discussionsupporting

confidence: 73%

Climatic and vegetational controls of Holocene wildfire regimes in the boreal forest of northern Fennoscandia

et al. 2023

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Climate change is expected to increase wildfire activity in boreal ecosystems, thus threatening the carbon stocks of these forests, which are currently the largest terrestrial carbon sink in the world. Describing the ecological processes involved in fire regimes in terms of frequency, size, type (surface vs. crown) and severity (biomass burned) would allow better anticipation of the impact of climate change on these forests. In Fennoscandia, this objective is currently difficult to achieve due to the lack of knowledge of long‐term (centuries to millennia) relationships between climate, fire and vegetation. We investigated the causes and consequences of changes in fire regimes during the Holocene (last ~11,000 years) on vegetation trajectories in the boreal forest of northern Finland. We reconstructed fire histories from sedimentary charcoal at three sites, as well as vegetation dynamics from pollen, moisture changes from Sphagnum spore abundance at two sites, and complemented these analyses with published regional chironomid‐inferred July temperature reconstructions. Low‐frequency, large fires were recorded during the warm and dry mid‐Holocene period (8500–4500 cal. year BP), whereas high‐frequency, small fires were more characteristic of the cool and wet Neoglacial period (4500 cal. year BP onward). A higher proportion of charcoal particles with a woody aspect—characterizing crown fires—was recorded at one of the two sites at times of significant climatic and vegetational changes, when the abundance of Picea abies was higher. Synthesis. Our results show both a direct and an indirect effect of climate on fire regimes in northern Fennoscandia. Warm and dry periods are conducive to large surface fires, whereas cool and moist periods are associated with small fires, either crown or surface. Climate‐induced shifts in forest composition also affect fire regimes. Climatic instability can alter vegetation composition and structure and lead to fuel accumulation favouring stand‐replacing crown fires. Considering the ongoing climate warming and the projected increase in extreme climatic events, Fennoscandian forests could experience a return to a regime of large surface fires, but stand‐replacing crown fires will likely remain a key ecosystem process in areas affected by climatic and/or vegetational instability.

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Section: Discussionsupporting

confidence: 73%

Climatic and vegetational controls of Holocene wildfire regimes in the boreal forest of northern Fennoscandia

et al. 2023

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“…In order to evaluate the processes of metal deposition and their transformation under environmental conditions, it is essential to ascertain the geochemical forms in which metals coexist within bottom sediments [7,[43][44][45][46]. The catchment areas of the investigated lakes are characterized by the low productivity of subarctic terrestrial ecosystems and organically poor acidic stony soils [22]. Despite these characteristics, the meromictic lakes isolated from the White Sea exhibit contrasting features from other subarctic ecosystems, as they display an elevated accumulation of organic matter.…”

Section: Discussionmentioning

confidence: 99%

“…The Kindo Peninsula and its surrounding experience relatively cold climatic conditions, and the presence of nutrient-depleted acidic crystalline rocks contributes to the low productivity of terrestrial ecosystems [22]. In terms of biogenic components (P-PO 4− , 0-56 µg/L; N-NH 4+ , 0-20 µg/L; Si, 0.02-2 mg/L), the upper layer of the water column (myxolimnion) in the studied lakes (Cape Zeleny lagoon, Kislo-Sladkoe, Trekhtzvetnoe Lake) can be classified as oligotrophic.…”

Section: Study Areamentioning

confidence: 99%

“…Unlike Trekhtzvetnoe Lake, seawater enters Lake Kislo-Sladkoe during spring tides and strong wind surges, while freshwater runoff remains negligible. Consequently, surface waters with low salinity are established, reaching minimum values (6-7 PSU) after snow and ice melting, and peaking during winter (20)(21)(22)(23)(24)(25). Waters below a depth of 2 m exhibit salinity levels approximately equivalent to or higher than those in the sea (24 PSU), a result of salt crystallization during winter freezing [28].…”

Section: Study Areamentioning

confidence: 99%

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Heavy Metals in Sediments of Subarctic Meromictic Lakes of the White Sea as Possible Tracers of Environmental Changes

Budko,

Demina,

Krasnova

et al. 2023

JMSE

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Meromictic lakes of the marine coast, quite widely distributed in the northern hemisphere, are the result of climate changes and glacier retreat. The bottom sediments of these lakes serve as a geological chronicle of the history of marine basin’s development with the geochemical occurrence forms of elements indicate various processes of their accumulation. This paper presents research results concerning the occurrence of forms of heavy metals in lake sediments along the coast of the White Sea. These results are based on a sequential seven step leaching procedure, followed by ICP-MS analysis and subsequent statistical data processing. To determine differences among the examined geochemical parameters, Pearson’s correlation analysis and Ward’s cluster analysis were utilized. The total content of Cr, Mn, Fe, Co, Ni, Zn, V, and Pb in the sediments did not exhibit significant differences based on their degree of isolation from the sea. The major contribution to deposition of these metals in sediments of the meromictic lakes studied is the residual form, encompassing the mineral matrix of the sediment. At the same time, the elevation of mobile forms for all the metals examined corresponds to an increase in the isolation of lakes from the White Sea. In the meromictic lake sediments, concentrations of Cu, Mo, and U demonstrated significant increases in forms tightly bound to organic matter, while Cd exhibited an association with Fe-Mn oxyhydroxides. Notably, a significant difference in the occurrence forms of Cu, Cd, Mo, and U was evident in the reduced sediments of meromictic lakes when compared to those of open sea bays. The meromictic lakes along the White Sea coast, positioned at various stages of isolation, hold promise for investigating the migration of metals in response to environmental changes.

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A multi-proxy reconstruction of peatland development and regional vegetation changes in subarctic NE Fennoscandia (the Republic of Karelia, Russia) during the Holocene

Cited by 2 publications

References 48 publications

Climatic and vegetational controls of Holocene wildfire regimes in the boreal forest of northern Fennoscandia

Climatic and vegetational controls of Holocene wildfire regimes in the boreal forest of northern Fennoscandia

Heavy Metals in Sediments of Subarctic Meromictic Lakes of the White Sea as Possible Tracers of Environmental Changes

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