DOI: 10.1016/j.gloplacha.2015.09.010
论文题名: Holocene environmental changes in southern Kamchatka, Far Eastern Russia, inferred from a pollen and testate amoebae peat succession record
作者: Klimaschewski A. ; Barnekow L. ; Bennett K.D. ; Andreev A.A. ; Andrén E. ; Bobrov A.A. ; Hammarlund D.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2015
卷: 134 起始页码: 142
结束页码: 154
语种: 英语
英文关键词: Climate change
; Holocene
; Kamchatka
; Landscape development
; Pollen
; Testate amoebae
Scopus关键词: Charcoal
; Climate change
; Forestry
; Soil moisture
; Soils
; Vegetation
; Wetlands
; Holocenes
; Kamchatka
; Landscape development
; Pollen
; Testate amoebae
; Protozoa
; abundance
; bioaccumulation
; climate variation
; coniferous tree
; high temperature
; Holocene
; landscape change
; paleoenvironment
; pollen
; protist
; radiocarbon dating
; sedge
; shrub
; soil moisture
; succession
; vegetation cover
; Kamchatka
; Pacific Ocean
; Russian Federation
; Sea of Okhotsk
; Alnus
; Alnus incana
; Alnus viridis
; Betula
; Carex
; Ericaceae
; Filicophyta
; Filipendula
; Larix
; Myrica
; Myrica gale
; Picea
; Pinus pumila
; Poaceae
; Thalictrum
英文摘要: High resolution palaeoenvironmental records in Far-Eastern Russia are rare, and the Kamchatka Peninsula is among the least studied areas of the region. This paper describes a record spanning the last ca. 11,000. yr, obtained from a bog in the southern part of Kamchatka. The radiocarbon dated core was analysed for pollen, testate amoebae, charcoal and loss-on-ignition (LOI).The vegetation during the early Holocene was dominated by grasses (Poaceae), birch (Betula) and heath (Ericaceae p. p.). Around 10,300. cal. yr BP there was a substantial change in the vegetation cover to shrub alder (Alnus viridis s.l.) stands with sedges and ferns (Polypodiophyta) as well as herbs such as meadow rue (Thalictrum) in the understory. In the surroundings of Utka peatlands started to form. The variations in the vegetation cover were most probably caused by climatic changes. At the beginning of sediment accumulation, before 10,300. cal. yr BP, the composition of the vegetation points to cooler summers and/or decreased annual precipitation. Around 10,300. cal. yr BP, changes in vegetation occurred due to rising temperatures and/or changed water regimes. Increased abundancies of dry indicating testate amoebae after 9100 cal. yr BP point to intermediate to dry soil conditions. Between 8600 and 7700 cal. yr BP tree alder (Alnus incana) was widely spread at the site which probably indicates optimal environmental conditions. The tephra layer at 381-384.5. cm (ca. 8500 cal. yr BP) produces a strong impact on the testate amoebae assemblages. At 7700 cal. yr BP there was a sudden drop of A. incana in the local vegetation. From this time on, A. incana and also A. viridis decrease continuously whereas Betula gradually increases. The upper part of the sequence (after 6300 cal. yr BP) shows higher abundancies of meadowsweet (Filipendula) and sweet gale (Myrica) pollen. After 6300 cal. yr BP, changes in testate amoebae demonstrate variable soil moisture conditions at the site. Between 3700 and 1800 cal. yr BP, wet conditions dominate as dry indicating testate amoebae decrease. After 1800 cal. yr BP soil conditions become more variable again but this time with dry dominating testate amoebae. In contrast to surrounding regions, there is no evidence of trees such as spruce or larch growing in the surroundings of the site even though those trees are characteristic of many eastern Siberian sites. This difference might be because of the maritime influence of the Okhotsk Sea. Even dwarf pine (Pinus pumila), which is currently widely dispersed in northern Kamchatka, became part of the local vegetation only during the last 700 yr. © 2015. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946553172&doi=10.1016%2fj.gloplacha.2015.09.010&partnerID=40&md5=bea70a88fd7a0b62df63c79a6d4a9389
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11464
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: School of Geography, Archaeology and Palaeoecology, Queen's University Belfast, Northern Ireland, United Kingdom
Recommended Citation:
Klimaschewski A.,Barnekow L.,Bennett K.D.,et al. Holocene environmental changes in southern Kamchatka, Far Eastern Russia, inferred from a pollen and testate amoebae peat succession record[J]. Global and Planetary Change,2015-01-01,134.