Reconstruction of Turgoyak lake (the Southern Urals) ecosystem changes in holocene

Масленникова, А. В.; Udachin, Valery; Deryagin, V. V.; Штенберг, М. В.

doi:10.24930/1681-9004-2018-18-6-914-927

Cited by 9 publications

(10 citation statements)

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“…This method is based on oxidation of organic matter with potassium bichromate solution in sulphuric acid and following estimation of excess oxidant by Mohr’s salt (ammonium ferrous sulphate) (Arinushkina, 1970). Previously, we identified a well-defined correlation between LOI 550°C and organic carbon concentration determined by the bichromate method (Maslennikova et al, 2014). Since the LOI 550°C procedure is much simpler than analysis of organic carbon concentration, the sediment organic matter content for the Lake Syrytkul sediments was estimated by LOI (Dean, 1974).…”

Section: Methodsmentioning

confidence: 86%

“…BP (Panova and Antipina, 2015). As follows from the palynological analysis of the Southern Urals lake sediments, this very time is characterized by maximum spread of broad-leaved trees (Maslennikova et al, 2014, 2015). These changes also recorded in numerous palaeorecords (Blyakharchuk and Sulerzhitsky, 1999; Borisova et al, 2011; Brooks et al, 2015; Nazarova et al, 2013) are global and related to orbital changes at 6000 cal.…”

Section: Introductionmentioning

confidence: 99%

“…Climate instability at ~3500–2000 cal. BP noted in the palaeorecords of Northern Hemisphere regions (Bezrukova et al, 2008; Brooks et al, 2015; Jennings et al, 2002; Mayewski et al, 2004) also affected pollen records of the Southern and Middle Urals lakes (Maslennikova et al, 2014, 2016b).…”

Section: Introductionmentioning

confidence: 99%

“…These investigations made it possible to establish climate changes and major stages of vegetation in the Urals (Khotinsky, 1977). These data were updated by the palynological analysis and AMS 14 C dating of the peat cores (Panova and Antipina, 2015; Zaretskaya et al, 2014) and lake sediment cores (Maslennikova et al, 2014, 2015, 2016b).…”

Section: Introductionmentioning

confidence: 99%

“…BP and an increase in precipitation and duration of vegetation period after ~9000 cal. BP (Maslennikova et al, 2014, 2015). According to the palynological and archaeological data from the Middle Urals peat lands, the stable warm humid conditions were interrupted by climate aridization at 6200–5800 and 5400 cal.…”

Section: Introductionmentioning

confidence: 99%

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Lakes ecosystem response to Holocene climate changes and human impact in the Southern Urals: Diatom and geochemical proxies

Масленникова

Udachin

2016

The Holocene

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Major changes in the Holocene were identified based on a diatom and geochemical analysis of sediment cores from Lakes Ufimskoe and Syrytkul (the Southern Urals). The Lake Ufimskoe ecosystem in the Central mountain area is identified to be highly sensitive to variations in temperature. Meanwhile, Lake Syrytkul is more responsive to climate aridization because of its limnological characteristics and less precipitation in the piedmont area. Climate events were the main drivers for lake ecosystems dynamics throughout almost the whole history of the lakes. The records of lake sediments reflect several climate events noted elsewhere in the Northern Hemisphere: Lateglacial–Holocene transition (~12,000–11,600), Preboreal oscillation (~11,200–11,000 cal. BP), climate warming and aridization (~9700–9600 cal. BP), warming and increase in precipitation since 9000 cal. BP, climate aridization at ~5800 cal. BP, cooling since 4000 cal. BP, and warming at ~2500 cal. BP. Climate warming of the last hundred years was not reflected in lake sediment records because of the significant human impact on the lake ecosystem. The upper sediments of both lakes are enriched in As, Bi, Sb, Te, Sn, Cd, Cu, Zn and Pb because of the influence of the Karabash copper smelter. However, the significant changes of the Lake Syrytkul ecosystem are not related to the technogenic impact and explained mainly by the dam construction. The changes in diatom communities identified in Lake Ufimskoe, which is located in an area geologically sensitive to acidification, are related to the acidification and heavy metal loading on the water area.

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Section: Methodsmentioning

confidence: 86%