The influence of climatic change, fire and species invasion on a Tasmanian temperate rainforest system over the past 18,000 years

QUATERNARY SCIENCE REVIEWS

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Article

Michael-Shawn, Fletcher¹  David, M. J. S. Bowman²  Cathy, Whitlock^3,4  Michela, Mariani^1,5  Kristen, K. Beck^1,6  Laura, N. Stahle³  Felicitas, Hopf⁷  Alexa, Benson¹  Tegan, Hall¹  Hendrik, Heijnis⁸  Atun, Zawadzki⁸ 

[1] Univ Melbourne, Sch Geog, 221 Bouverie St, Carlton, Vic 3053, Australia

[2] Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia

[3] Montana State Univ, Dept Earth Sci, Bozeman, MT 59717 USA

[4] Montana State Univ, Montana Inst Ecosyst, Bozeman, MT 59717 USA

[5] Univ Nottingham, Sch Geog, Nottingham, England

[6] Univ Lincoln, Sch Geog, Lincoln LN6 7TS, England

[7] Australian Natl Univ, Coll Asia & Pacific, Archaeol & Nat Hist, Canberra, ACT 0200, Australia

[8] Australian Nucl Sci & Technol Org, Locked Bag 2001, Kirrawee, NSW 2232, Australia

关键词: Pollen;    Fire;    Rainforest;    Tasmania;    Topographic fire refugia;    Climate change;    Eucalyptus;   

DOI  :  10.1016/j.quascirev.2021.106824

来源: Elsevier

【 摘 要 】

We aim to understand how did cool temperate rainforest respond to changes in climate and fire activity over the past 18 kcal yrs, interrogating the role that flammable plant species (such as Eucalyptus) have in the long-term dynamics of rainforest vegetation. We used high-resolution pollen and charcoal analysis, radiometric dating (lead and carbon), modern pollen-vegetation relationships, detrended correspon-dence analysis, rarefaction (palynological richness), rate of change and granger causality to understand the patterns and drivers of change in cool temperate rainforest from the sediments of Lake Vera, southwest Tasmania through time. We record clear changes in key rainforest taxa in response to climatic change throughout the record. The spread of rainforest through the lake catchment in the early and mid-Holocene effectively negated disturbance from fire despite a region-wide peak in fire activity. An anomalously dry period in the late-Holocene resulted in a local fire that facilitated the establishment of Eucalyptus within the local catchment. Granger causality tests reveal a significant lead of Eucalyptus over fire activity in the Holocene, indicating that fires were enhanced by this pyrogenic taxon following establishment. (c) 2021 Elsevier Ltd. All rights reserved.

【 授权许可】

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