Evolution of a Holsteinian (MIS 11c) palaeolake based on a 12‐ka‐long diatom record from Dethlingen (northern Germany)
Evolution of a Holsteinian (MIS 11c) palaeolake based on a 12‐ka‐long diatom record from Dethlingen (northern Germany)
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基于德特林根（德国北部）12 卡长硅藻记录的荷斯坦阶 (MIS 11c) 古湖泊的演化
作者：
Koutsodendris;Lotter;Kirilova;Verhagen;Brauer
为了深入了解在没有人类干扰的情况下水生生态系统的长期演变，我们在这里评估了一个跨度约12 ka的荷尔斯泰因间冰期（海洋同位素阶段11c）的年代际到百年尺度分辨率的硅藻记录。我们利用来自Dethlingen古湖（德国北部）的部分变异沉积物岩心，记录了水生环境和周围陆地环境的共同演化，该岩心先前已被研究过孢粉学和微相信号。硅藻记录以stephanodiscus属、Aulacoseira属、ulnariia属和fragilaria属为主。根据硅藻组合和物性沉积特征，Dethlingen古湖泊的演化可划分为三个主要阶段。在最古老的阶段（持续约1900年），湖泊深约10-15米，以缺氧的底水条件和高营养含量为特征。随后的~ 5600年出现了水深约20 m，硅藻和菊科植物产量最大，异质养分输入达到峰值。在这个阶段，水柱混合变得更加剧烈，导致缺氧的分解。最年轻的湖泊阶段（~ 4000-5000年）的特征是水深减少，水条件动荡，营养物质负荷减少。根据我们的古湖泊学数据，我们得出结论，在荷尔斯泰因间冰期，Dethlingen古湖泊的演变与以下变化密切相关：(1)流域内的变化（由植被和沉积记录）与从生长在营养丰富的土壤上的封闭森林（中等森林阶段）过渡到生长在贫瘠土壤上的开放森林（低密度森林阶段）有关；（ii）百年尺度气候扰动所反映的短期气候变率。
To provide insights into the long‐term evolution of aquatic ecosystems without human interference, we here evaluate a decadal‐ to centennial‐scale‐resolution diatom record spanning about 12 ka of the Holsteinian interglacial (Marine Isotope Stage 11c). Using a partially varved sediment core from the Dethlingen palaeolake (northern Germany), which has previously been studied for palynological and microfacies signals, we document the co‐evolution of the aquatic and surrounding terrestrial environment. The diatom record is dominated by the generaStephanodiscus,Aulacoseira,UlnariaandFragilaria. Based on the diatom assemblages and physical sediment properties, the evolution of the Dethlingen palaeolake can be subdivided into three major phases. During the oldest phase (lasting ∼1900 varve years), the lake was ∼10–15 m deep and characterized by anoxic bottom‐water conditions and a high nutrient content. The following ∼5600 years exhibited water depths >20 m, maximum diatom andPediastrumproductivity, and a peak in allochtonous nutrient input. During this phase, water‐column mixing became more vigorous, resulting in a breakdown of anoxia. The youngest lake phase (∼4000–5000 years) was characterized by decreasing water depth, turbulent water conditions and decreased nutrient loading. Based on our palaeolimnological data, we conclude that the evolution of the Dethlingen palaeolake during the Holsteinian interglacial responded closely to (i) changes within the catchment area (as documented by vegetation and sedimentation) related to the transition from closed forests growing on nutrient‐rich soils (mesocratic forest phase) to open forests developing on poor soils (oligocratic forest phase), and (ii) short‐term climate variability as reflected in centennial‐scale climate perturbations.
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DOI：
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DOI：
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