Abstract

New data on the content of chlorophyll a with pheopigments (Chl + Ph) in bottom sediments (BSs) of the Ivankovo and Uglich reservoirs of the Upper Volga (Russia) obtained in 2019 are given. The relationships between pigment concentrations and characteristics of bottom sediments and depth are analyzed. It is established that at present the average concentration of Chl + Ph is 156 μg/g dry weight in the Ivankovo and 105 μg/g dry weight in the Uglich reservoirs, which exceeds the values obtained 20 years ago (126 and 79 μg/g dry weight, respectively). An increase in the concentration of sedimentary pigments was recorded mainly in the zones of silt accumulation. The weighted average content of sedimentary pigments calculated based on the areas of different sediments makes it possible to estimate the trophic state of the benthic zone in the Ivankovo Reservoir (125 μg/g dry weight) as the initial stage of hypertrophy and in the Uglich Reservoir (52.8 μg/g dry weight) as the final stage of mesotrophy. The trophic state of the benthic zone in both water bodies corresponds to the eutrophic status of the pelagic zone.

中文翻译：

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根据沉积颜料的含量，伊万科沃和乌格利奇水库底栖地带的现代营养状态

摘要

叶绿素a含量的新数据给出了2019年获得的上伏尔加河（俄罗斯）伊万科沃和乌格利奇水库底部沉积物（BSs）中的色素（Chl + Ph）。分析了颜料浓度与底部沉积物特征和深度之间的关系。已经确定，目前伊万科沃的Chl + Ph的平均浓度为干重156微克/克，乌格利奇水库的平均干重为105微克/克，超过了20年前的平均值（126和79微克/克干重）。沉积颜料浓度的增加主要记录在淤泥堆积区域。根据不同沉积物的面积计算得出的沉积颜料的加权平均含量使得可以估算伊凡科沃水库（125μg/ g干重）底栖生物区的营养状态，作为肥大的初始阶段和乌格利奇水库（52.8μg/ g干重）作为中营养的最后阶段。两个水体中底栖带的营养状态对应于中上层带的富营养化状态。