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首页> 外文期刊>The holocene >Lakes ecosystem response to Holocene climate changes and human impact in the Southern Urals: Diatom and geochemical proxies
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Lakes ecosystem response to Holocene climate changes and human impact in the Southern Urals: Diatom and geochemical proxies

机译：南部乌拉尔地区湖泊生态系统对全新世气候变化和人类影响的响应：硅藻和地球化学代理

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摘要

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 (similar to 12,000-11,600), Preboreal oscillation (similar to 11,200-11,000 cal. BP), climate warming and aridization (similar to 9700-9600 cal. BP), warming and increase in precipitation since 9000 cal. BP, climate aridization at similar to 5800 cal. BP, cooling since 4000 cal. BP, and warming at similar to 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.
机译：根据硅藻和Ufimskoe湖和Syrytkul湖（南部乌拉尔）的沉积物芯的地球化学分析，确定了全新世的主要变化。中央山区的乌菲姆斯科湖生态系统对温度变化高度敏感。同时，Syrytkul湖的气候特征和山前地区的降水较少，因此对气候干旱化反应更加敏感。气候事件几乎是整个湖泊历史上推动湖泊生态系统动态的主要动力。湖泊沉积物的记录反映了北半球其他地方记录的几种气候事件：晚冰期-全新世过渡（约12,000-11,600），前原地带振荡（约11,200-11,000 cal。BP），气候变暖和干旱化（类似于9700- 9600 cal。BP），从9000 cal开始变暖和降水增加。 BP，气候干旱化程度接近5800 cal。 BP，自4000 cal开始冷却。 BP，升温至2500 cal。 BP。由于人类对湖泊生态系统的重大影响，过去一百年的气候变暖没有反映在湖泊沉积物中。由于Karabash铜冶炼厂的影响，两个湖泊的上层沉积物均富含As，Bi，Sb，Te，Sn，Cd，Cu，Zn和Pb。但是，Syrytkul湖生态系统的重大变化与技术影响无关，并且主要由大坝建设来解释。位于对酸化地质敏感的乌菲姆斯科湖中的硅藻群落变化与水域的酸化和重金属含量有关。

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