Environmental Changes Recorded in Deposits of the Izyubrinye Solontsi Lake, Sikhote-Alin
N. G. RAZZHIGAEVA1, L. A. GANZEY1, T. A. GREBBENNIKOVA1, T. A. KOPOTEVA2, L. M. MOKHOVA1, A. M. PANICHEV1, E. P. KUDRYAVTSEVA1, Kh. A. ARSLANOV3, F. E. MAKSIMOV3, A. Yu. PETROV3, M. A. KLIMIN2
1Pacific Geographical Institute FEB RAS, 690041, Vladivostok, Radio str., 7
2Institute of Aquatic and Ecological Problems, FEB RAS, 680000, Khabarovsk, Dikopoltsev str., 56
3St.-Petersburg State University, 199034, St. Petersburg, Universitetskaya emb., 7/9
Keywords: климатические изменения, поздний голоцен, озерно-болотные обстановки, палеоландшафты, пожары, Сихотэ-Алинь, climatic changes, Late Holocene, lacustrine-swamp invironments, paleolandscapes, fires, Sikhote-Alin
Abstract
We reconstructed environmental changes that took place during the development of the Izyubrinye Solontsy Lake that belongs to the Solontsovskie (Shanduyskie) lake system located in the midlands of the Eastern Sikhote-Alin. Lakes were formed by landslides from the paleovolcano slopes. We performed a high resolution reconstruction of palaeoenvironmental changes using multi-proxy data (botanical, diatom, spore-pollen, radiocarbon analysis) from a peat section. We revealed high variability of the lake and the surrounding swamp palaeoenvironments in response to climate change in the late Holocene. Peat accumulation started ca 4000 14С yrs BP. The main peat-forming plants were Sphagnum mosses and herbs, except for the period between 2330 and 1530 14C yrs BP (2360-1480 cal. yrs BP) when the swamp was overgrown by larch forests and predominantly woody peat accumulated. Forest ecosystems on the lake coasts were quite stable. During the warm phases the role of fir and broadleaved trees increased in coniferous forests that include cedar; during the cooling intervals birch became more widespread. During the last millennium secondary forests occupied the lowlands. We determined ages of paleofires.
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