加拿大曲梅西部冰期后糖枫边缘种群的建立和扩展:孢粉检测及其与火、气候和演替过程的相互作用

IF 1.6 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Holocene Pub Date : 2023-07-07 DOI:10.1177/09596836231183065
Jordan Paillard, P. Richard, O. Blarquez, P. Grondin, Y. Bergeron
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引用次数: 1

摘要

一个孤立的糖枫(Acer saccharum Marsh.)林分位于阿比提比的北方森林中,比它目前的北部范围超出约75公里。这种相对喜热的树种是什么时候在冰川消退后形成的?在过去的某个时候,它的人口比现在多吗?如果是这样,它们是在何时以及如何扩张然后收缩的?这个物种是如何在北方森林中存活下来的?火在这个证人席上的作用是什么?为了回答这些问题,我们重建了冰川后的火灾和植被历史,这些火灾和植被历史是由分布在北纬180公里的三个湖泊沉积物序列组成的,从南方北方针叶林到北方落叶林。从北到南,分别是拉贝勒湖、查瑟湖和富尔湖。我们探索了一种基于花粉积累率的程序,以检测湖泊流域可能存在的糖枫。这个过程成功地指出了一个糖枫树的建立,大约7800-5100 cal. BP在Fur, 5500-4400 cal. BP在Chasseur和大约4000-2700 cal. BP在Labelle,在北部。在Fur,随后的糖枫扩张发生在建立后的1至2千年,在更冷、更潮湿的气候条件下,大约6000-5000 cal. BP,桦树(Betula spp.)取代了松(Pinus strobus L.)。在Fur和Chasseur,糖枫的建立、持续或扩张显然与火灾活动的变化无关,但在Labelle, 2000年至500年前,在较短的火灾返回间隔期间,该物种更为丰富。我们的研究表明,北方(Chasseur和Labelle)糖枫的建立和可能的扩张可能更多地受到抑制和促进动力学的复杂相互作用的控制,而不仅仅是气候,这一过程依赖于优势植被的组成和结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Postglacial establishment and expansion of marginal populations of sugar maple in western Québec, Canada: Palynological detection and interactions with fire, climate and successional processes
An isolated sugar maple (Acer saccharum Marsh.) stand is located in the boreal forest of Abitibi, about 75 km beyond its present northern range limit. When did this relatively thermophilous tree species establish after ice retreat? Were its populations more abundant than now sometimes in the past? If so, when and how did they expand then retracted? How did the species persist in boreal forest over time? What could have been the role of fire on this stand? To answer those questions, we reconstructed the postglacial fire and vegetation history from three lacustrine sediment sequences distributed along a c. 180 km latitudinal transect from southern boreal forests to the northern portion of deciduous forests. From north to south, those are lakes Labelle, Chasseur and Fur. We explored a procedure based on pollen accumulation rates in order to detect the probable presence of sugar maple within the lakes’ watershed. The procedure successfully indicates a sugar maple establishment c. 7800–5100 cal. BP at Fur, 5500–4400 cal. BP at Chasseur and c. 4000–2700 cal. BP at Labelle, in the north. At Fur, the subsequent sugar maple expansion happened 1 to 2 thousand years after establishment, during colder and moister climatic conditions favoring Pinus strobus L. replacement by Betula spp. c. 6000–5000 cal. BP. Sugar maple establishment, persistence or expansion is apparently not linked to a change in fire activity at Fur and Chasseur, but at Labelle, the species was more abundant during periods of shorter fire return intervals from 2000 to 500 years ago. Our study suggests that northern (Chasseur and Labelle) sugar maple establishment and possible expansion was probably more controlled by a complex interaction of inhibition and facilitation dynamics than by climate alone, a process reliant on the dominant vegetation’s composition and structure.
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来源期刊
Holocene
Holocene 地学-地球科学综合
CiteScore
4.70
自引率
8.30%
发文量
106
审稿时长
4 months
期刊介绍: The Holocene is a high impact, peer-reviewed journal dedicated to fundamental scientific research at the interface between the long Quaternary record and the natural and human-induced environmental processes operating at the Earth''s surface today. The Holocene emphasizes environmental change over the last ca 11 700 years.
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