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Karpenko L. V., Prokushkin A. S. Reconstruction of Fires in Virgin Forests at Sym-Dubches Interfluve in the Holocene

Keywords:
bogs, forest fires, the Holocene, stratigraphy, radiocarbon dating, pyrogenic interlayers, reconstruction

Abstract

UDC 571.51:630.43:551.312.22:551.795

How to cite: Karpenko L. V., Prokushkin A. S. Reconstruction of fires in virgin forests at Sym-Dubches interfluve in the Holocene // Sibirskij Lesnoj Zurnal (Sib. J. For. Sci.). 2019. N. 5. P. … (in Russian with English abstract).

DOI: 10.15372/SJFS20190508

© Karpenko L. V., Prokushkin A. S., 2019

Received 20.05.2019

Results of reconstructions of ground forest fires on bogs of middle taiga subzone in the Priyenisei Siberia are presented for the Holocene. The stratigraphy analysis of the peat deposit, layer-by-layer peat 14С dating and morphological studying the pyrogenic interlayers allowed to set the time of fires, their periodicity and intensity. It was established that the intensity and periodicity of fires were different in southern (the key plot «Krivlyak») and northern (the key plot «Razvilki – Khoiba») parts of the Sym- Dubchess interfluve. 6 pyrogenic interlayers were revealed in the bog peat deposit on the key plot «Krivlyak», and their age was the following: 8015 years ago (e. a.), 6795, 2675, 2280, 1780, 1550 y. a. The interval between fires according to the data of «Mochazhina» profile was 4515 years, that one of the «Bugor» profile was 5340, 895, 230 years. All the fires were low intensive and didn't greatly influence on bog formation process. The 16 pyrogenic interlayers were recorded in stratigraphy of the bog on the key plot «Razvilki – Khoiba». It was stated that the low intensive fires took place in 7790, 7412, 5958, 5745, 5030, 2339, 1351, 1099 y. a. The high intensive fires which had a considerable impact on the change of bog phytocoenoses and on the rate of peat accumulation happened in 12237, 7174, 5940, 5427, 4914, 2187, 2072, 1957 y. a. The interval between fires in each profile of this plot varies greatly. Frequent repeatability of forest fires was noted in the Atlantic and in the first half of the Subatlantic periods. In the late Holocene on the bogs the change of forest and forest-bog phytocoenoses by heavily flooded swamp hummock ridge – bog hollow complexes with dominating Sphagnum fuscum (Schimp.) H. Klinggr.in moss cover happened. The impact of forest fires on the peripheral part of bogs in key plots stopped during this period. The fires on the studied bogs contributed to the revitalization of forest forming process. Post-fire successions were mainly presented by birch and birch- pine grass phytocoenoses.


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