The post-fire shift of temperate white pine-birch forest to boreal balsam fir forest in eastern Canada: climate-fire implications

IF 1 4区生物学 Q3 PLANT SCIENCES

Botany Pub Date : 2023-04-20 DOI:10.1139/cjb-2023-0036

S. Payette, M. Frégeau, P. Couillard, Jason Laflamme

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引用次数: 2

Abstract

11Extensive 14C dating and botanical identification of charcoal fragments located in the 12 organic soil surface and buried in the mineral podzolic solum were used to reconstruct the 13 successional pathways of a balsam fir forest site. The studied forest site developed in a 14context of continuous fire disturbance over the last 9000 years with at least 26 fires 15 occurring at a mean interval of 330 years. Tree vegetation of the site followed a four-step 16 trajectory consisting of an early-Holocene spruce forest and a late-Holocene mixedwood 17 balsam fir forest. Boreal-like spruce-birch and temperate-like white pine-birch forests 18dominated the site between 7900-5900 cal. BP and 5600-1275 cal. BP, respectively.19because all forest types developed repeatedly after fire since early deglaciation, changes 20 in forest composition, in particular the shift of white pine forest to balsam fir forest, and 21 concurrent decline of birch (yellow birch and/or paper birch) and pine populations, were 22 most likely related to progressive cooler and wetter conditions from mid- to late23Holocene. Fire disturbance on this part of the southern boreal biome has been a24continuous, positive regenerative process over the Holocene allowing the successional

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加拿大东部温带白松-桦树林向北方香脂冷杉林的火灾后转变：气候火灾影响

11对位于12有机土壤表面并埋在矿物灰化土中的木炭碎片进行了广泛的14C定年和植物学鉴定，以重建香脂冷杉林的13条演替路径。所研究的森林场地是在过去9000年中持续火灾干扰的背景下发展起来的，平均间隔330年至少发生26次火灾。该场地的树木植被遵循四步16轨迹，包括全新世早期的云杉林和全新世晚期的混合木17香脂冷杉林。在7900-5900 cal.BP和5600-1275 cal.BP之间，北方类云杉-桦树和温带类白松-桦树林18分别占据了该地区的主导地位。19由于自早期冰消以来，所有森林类型都在火灾后反复发展，森林组成发生了20变化，特别是白松林向香脂冷杉林的转变，以及21桦树（黄桦树和/或纸桦树）和松树种群的同时减少，22最有可能与全新世中期至晚期逐渐变冷和变湿的条件有关23。北方南部生物群落这一部分的火灾扰动在全新世是一个持续的、积极的再生过程

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来源期刊

Botany 生物-植物科学

CiteScore

2.20

自引率

9.10%

发文量

期刊介绍： Botany features comprehensive research articles and notes in all segments of plant sciences, including cell and molecular biology, ecology, mycology and plant-microbe interactions, phycology, physiology and biochemistry, structure and development, genetics, systematics, and phytogeography. It also publishes methods, commentary, and review articles on topics of current interest, contributed by internationally recognized scientists.