Postglacial peatland vegetation succession in Store Mosse bog, south-central Sweden: An exploration of factors driving species change

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2022-01-31 DOI:10.1111/bor.12580
Eleonor E. Ryberg, Minna Väliranta, Antonio Martinez-Cortizas, Johan Ehrlén, Jenny K. Sjöström, Malin E. Kylander
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引用次数: 3

Abstract

Boreal peatlands are facing significant changes in response to a warming climate. Sphagnum mosses are key species in these ecosystems and contribute substantially to carbon sequestration. Understanding the factors driving vegetation changes on longer time scales is therefore of high importance, yet challenging since species changes are typically affected by a range of internal and external processes acting simultaneously within the system. This study presents a high-resolution macrofossil analysis of a peat core from Store Mosse bog (south-central Sweden), dating back to nearly 10 000 cal. a BP. The aim is to identify factors driving species changes on multidecadal to millennial timescales considering internal autogenic, internal biotic and external allogenic processes. A set of independent proxy data was used as a comparison framework to estimate changes in the bog and regional effective humidity, nutrient input and cold periods. We found that Store Mosse largely follows the expected successional pathway for a boreal peatland (i.e. lake → fen → bog). However, the system has also been affected by other interlinked factors. Of interest, we note that external nutrient input (originating from dust deposition and climate processes) has had a negative effect on Sphagnum while favouring vascular plants, and increased fire activity (driven by allogenic and autogenic factors) typically caused post-fire, floristic wet shifts. These effects interactively caused a floristic reversal and near disappearance of a once-established Sphagnum community, during which climate acted as an indirect driver. Overall, this study highlights that the factors driving vegetation change within the peatland are multiple and complex. Consideration of the role of interlinked factors on Sphagnum is crucial for an improved understanding of the drivers of species change on short- and long-term scales.

Abstract Image

瑞典中南部Store Mosse沼泽冰川后泥炭地植被演替:物种变化驱动因素的探索
北方泥炭地正面临着气候变暖的重大变化。泥炭藓是这些生态系统中的关键物种,对固碳有重要贡献。因此,了解在更长的时间尺度上驱动植被变化的因素是非常重要的,但也具有挑战性,因为物种变化通常受到系统内同时作用的一系列内部和外部过程的影响。这项研究提出了一个高分辨率的宏观化石分析从商店莫斯沼泽(瑞典中南部)泥炭核心,可追溯到近10000 cal。英国石油公司。目的是在考虑内部自生过程、内部生物过程和外部同种异体过程的时间尺度上,确定驱动物种变化的因素。利用一组独立的代理数据作为比较框架,估计了沼泽和区域有效湿度、养分输入和寒冷期的变化。我们发现,Store moss在很大程度上遵循了北方泥炭地的演替路径(即湖泊→沼泽→沼泽)。然而,这一制度也受到其他相互关联的因素的影响。有趣的是,我们注意到外部营养输入(来自尘埃沉积和气候过程)对泥炭属植物有负面影响,而对维管植物有利,并且火灾活动的增加(由同种异体和自生因素驱动)通常导致火灾后的植物区系湿移。这些影响相互作用,导致植物区系逆转,一度建立的泥鳅群落几乎消失,在此期间,气候起着间接驱动作用。总的来说,本研究强调了泥炭地植被变化的驱动因素是多元的和复杂的。考虑相互关联的因子对泥鳅的作用对于提高对物种短期和长期变化驱动因素的理解至关重要。
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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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