Late Holocene vegetation dynamics of the Muravyev-Amursky Peninsula (on the basis of soil-profile palynological data)
Boris PSHENICHNIKOV1, Marina LYASHCHEVSKAYA2 & Nina PSHENICHNIKOVA2
1 Far Eastern Federal University, Vladivostok, Russia
3 Pacific Geographical Institute FEB RAS, Vladivostok, Russia
In order to explore vegetation dynamics of Muravyev-Amursky Peninsula in late Holocene, we sampled the Southern,
Western, and Eastern areas using a test pit in each area (5-09, 7-09, 3-09 respectively). Analysis of spore-pollen
spectra of genetic horizons was carried out for polygenetic burozems or PB (the burozem profile comprises one modern
and one buried elementary soil profile). Palynological data allowed us to reconstruct paleoclimatic conditions
of Muravyev-Amursky Peninsula by Klimanov's (1981) informational-statistical method, based on statistical
correspondence between the percentage of different taxon pollens in present-day pollen complexes and climatic
conditions, under which the said complexes were formed. Spore-pollen spectrum compositions of PB genetic horizons
in each sample area give evidence of anthropogenic influence on vegetation dynamics, resulting from intense logging
of coniferous-broadleaved forests when the Peninsula was cultivated. Subsequent fires and developing erosion and
solifluction contributed to formation of polygenetic burozems; PB formation was also due to severe climatic
conditions of the final phase of the Short Ice Age. The age of PB buried humus-accumulative horizon [AY]
fully agrees with this thesis (test pit 5-09 - 150±60 years old (Ki-16630)). Spore-pollen spectra of horizons
BM[AY] (test pit 5-09), [AYBM] (test pit 3-09), and [BM] (test pit 7-09) indicate colder-than-modern climatic
conditions which gave rise to birch forests with fern-herb ground cover. These horizons are characterized by
high content of soil skeleton matter and stone material, which is the result of severe climatic conditions,
prevailing at the time of horizon formation. Overall, our research data show that the Peninsula vegetation
dynamics in late Holocene is due to both anthropogenic and climatic factors. This research is supported a grant
of the Russian Foundation for Basic Research, project no. 12-05-00017 and by grants of the Far Eastern Branch
of Russian Academy of Sciences, project no. 12-III-A-09-208, 12-III-B-09-200.
© 2012 Organizing Committee
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