Reconstruction of the Holocene palaeoenvironmental conditions accordingly to the multiproxy sedimentary records from Lake Pilvelis, Latvia

摘要: Abstract Reconstruction of the Holocene palaeoenvironment conditions in Southeastern Latvia is based on multiproxy records from Lake Pilvelis: pollen, plant macrofossil and microfossil analysis; loss-on-ignition (LOI) measurements; 14 C dating; humic substances content; humification index; elemental composition gyttja organic mass. The data complex obtained result studies sediments Pilvelis indicates significant changes depositional environment during lake development. Data show that start organic-rich formation before approximately 9750 cal BP, when birch–pine forest dominated surrounding landscape. Diagrams sets six remarkable comparatively short cooling periods Holocene, which are related to temperature water level influenced values variability remains. investigation recognized 8.4 ka BP 4.6 ka BP cold events, while other events can be recognised conditionally. During 4.0 ka BP, decreased extremely climate was probably drier, indicated by comparison Pilvelis, Mazais Svetinu Bog Razna. A pollen with Kurjanovas, Razna shows some similarities, revealing features cooler climatic at time characterised an increase Betula herb pollen.