Abstract

A comparative study of modern flood sediments (floodplain alluvium) and sediments of the initial stage of overgrowing of oxbow lakes (oxbow alluvium) in the middle reaches of the Kamchatka River has been performed for the first time using group bioanalysis. The differences in the percentage of different forms of diatoms and microresidues of higher plants have been revealed. The comparison of diatom complexes in the studied samples with analogous data on sediments in large lakes of Kamchatka attests to fundamental differences between these objects. Two genera of diatoms (Cyclotella and Stephanodiscus) are absent or are found in insignificant amounts in floodplain and oxbow alluvium. Bioresidues in sediments from flood water and in large long-living lakes differ in their composition. The results may be used to identify buried alluvium sediments in Central Kamchatka.

中文翻译：

---

堪察加河中游的现代洪泛区-牛弓沉积物：群体生物分析的结果

摘要

首次使用群体生物分析技术对堪察加河中游的现代洪水沉积物（洪泛平原冲积物）和牛弓湖过度生长初期的沉积物（牛弓冲积物）进行了比较研究。已经揭示了高等植物中不同形式的硅藻和微残留物的百分比差异。将研究样品中的硅藻复合物与堪察加半岛大湖沉积物的类似数据进行比较，证明了这些物体之间的根本差异。硅藻的两个属（Cyclotella和Stephanodiscus）在泛洪平原和牛弓冲积层中不存在或含量不高。洪水和大型长寿命湖泊中的沉积物中的生物残留物的成分不同。该结果可用于识别堪察加半岛中部的地下冲积物沉积物。