First post-glacial establishment of forest trees: early Holocene vegetation, mollusc settlement and climate dynamics in central Troms, North Norway

Jensen, Christin Eldegard; Kuiper, J. G. J.; Vorren, Karl‐Dag

doi:10.1080/030094802760260391

Cited by 32 publications

(20 citation statements)

References 28 publications

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“…Moreover, deviant boundary conditions during this early period (see above) complicate such comparisons. Anyhow, this estimate is roughly consistent with multiproxy data of the Holocene thermal optimum from various parts of the Scandes and the northwestern seaboard of Europe (Vorren & Stavseth 1996;Barnett et al 2001;Jensen et al 2002;Bigler et al 2003;Hammarlund et al 2004), although the data presented here place the optimum phase somewhat earlier. In general terms, the tree-line chronology presented in this study corroborates the Holocene arboreal history inferred from stratigraphic data, including pollen and plant macrofossils obtained from a site in the same area (Bergman et al 2005).…”

Section: Discussionsupporting

confidence: 85%

Holocene pine tree-line evolution in the Swedish Scandes: Recent tree-line rise and climate change in a long-term perspective

Kullman¹,

Kjällgren²

2006

SBOR

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BOREAS Kullman, L. & Kjällgren, L. 2006 (February): Holocene pine tree-line evolution in the Swedish Scandes: Recent tree-line rise and climate change in a long-term perspective. Boreas, Vol. 35, This article focuses on the Holocene tree line (Pinus sylvestris) and climate change in the Swedish Scandes. A composite of three previously independently published data sets of megafossil tree remains (trunks, stumps and roots) from sites above today's tree line is analysed. Calibration of ages, adjustment for glacio-isostatic land uplift and a larger sample provide new and more conclusive insights. The tree-line altitude peaked about 11 200 cal. yr BP, 425 m higher than the position about a century ago, when it was at its Holocene low. At the millennialcentennial scale, tree-line retraction has been a smooth process, following a linear trend, which largely conforms to the Milankovitch model of orbital forcing of summer temperature evolution. Shorter excursions from this trend cannot be ruled out, as these are beyond the resolution of the analytical approach. During the earliest Holocene, summers may have been about 2.58C warmer than by the late-19th century. Projection of the 20th-century maximum tree-line rise by 150 Á/190 m upon the entire Holocene tree-line chronology indicates that present-day tree lines may be higher than ever during the past 5000 or even 7000 years. Indirectly, this might reflect an anomalous modern climatic regime for which there is supporting evidence from retreating mountain glaciers and recent evolution of the alpine plant cover and its zonation patterns. With this background, the evolution of the tree-line ecotone in the case of continued warming is considered. Pine is likely to regain the dominant position held in the early Holocene. Its tree line may shift at least 400 m above its present position. Small outlier stands of mountain birch will establish in sheltered, moderately snow-rich habitats high above the new pine tree line, but an overall alpine character of the landscape will prevail above the tree line of pine. Exotic tree species, mainly belonging to the genus Pinus may profit from a new climatic regime and establish in the tree-line ecotone.

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Section: Discussionsupporting

confidence: 85%

Holocene pine tree-line evolution in the Swedish Scandes: Recent tree-line rise and climate change in a long-term perspective

Kullman¹,

Kjällgren²

2006

SBOR

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“…The glacier subsequently receded further inland, halting at the Alapmoen locality (AL event) and depositing a large sandur delta around 9200 14 C yr BP according to the ML correlation. A dating of fossil birch in Dividalen, c. 35 km southeast of (up-valley) Alapmoen gave an age of 9060 14 C yr BP (Jensen et al 2002), indicating that the glacier had receded far inland by this time, probably beyond the inner limit of the ML in the Øverbygd area.…”

Section: Post T-l Deglaciationmentioning

confidence: 99%

Deglaciation chronology and glaciomarine successions in the Malangen–Målselv area, northern Norway

Eilertsen¹,

Corner²,

Aasheim³

2005

Boreas

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“…The abundance of each macrofossil type is presented as number or relative abundance of 100 mL of sediment (cf. Jensen et al, 2002b). The winged nuts from Betula and Alnus are termed 'seeds'.…”

Section: Preparation and Analysis Of Pollen And Macrofossilsmentioning

confidence: 99%

“…A detailed qualitative reconstruction of early Holocene vegetation and climate up to the pre-/sub-alpine vegetation belt at 400 m a.s.l. is given in Jensen et al (2002b).…”

Section: Introductionmentioning

confidence: 99%

Holocene vegetation and climate dynamics of the boreal alpine ecotone of northwestern Fennoscandia

Jensen

Vorren

2008

J Quaternary Science

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Climate change with respect to summer temperature throughout the Holocene is inferred from oscillations in the local Pinus sylvestris, Alnus incana and Betula pubescens forest-lines, as recorded by fossil pollen and plant macrofossils in lake sediments at four altitudinal levels. Mt Skrubben (848 m a.s.l.), in Dividalen, was deglaciated down to below 280 m a.s.l. during 10 800-10 300 cal. yr BP. Betula pubescens established 10100 cal. yr BP at 280 m a.s.l. and expanded up to near the summit during the next 700 years. Birch woodland prevailed on the mountain plateau until 3300 cal. yr BP. Local Pinus sylvestris stands are recorded up to 400 m a.s.l. at 8450 cal. yr BP and >548 m a.s.l. about 8160 cal. yr BP. Alnus incana expanded from 400 to nearly 790 m a.s.l. during the period 7900-7600 cal. yr BP. The maximum forest distribution lasted until ca. 6000 cal. yr BP. Marked climatic deteriorations caused lowering of the forest-lines around 4600 and 3000 cal. yr BP. Reconstruction of the summer temperature indicated mean July temperatures at 400 m a.s.l. of 1.5-38C above the present during the period of maximum forest expansion, whereas >38C above the present temperature at 548 m a.s.l. This is in accordance with other regional temperature reconstructions from northern Europe.

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First post-glacial establishment of forest trees: early Holocene vegetation, mollusc settlement and climate dynamics in central Troms, North Norway

Cited by 32 publications

References 28 publications

Holocene pine tree-line evolution in the Swedish Scandes: Recent tree-line rise and climate change in a long-term perspective

Holocene pine tree-line evolution in the Swedish Scandes: Recent tree-line rise and climate change in a long-term perspective

Deglaciation chronology and glaciomarine successions in the Malangen–Målselv area, northern Norway

Holocene vegetation and climate dynamics of the boreal alpine ecotone of northwestern Fennoscandia

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