Aim Documenting past vegetation dynamics and fire-vegetation relationships at a regional scale is necessary to understand the mechanisms that control the functioning of the boreal forest, which is particularly sensitive to climate change. The objective of this study is to document these interactions in the Komi Republic during the Holocene. Location Yaksha, Vychegda river basin, Republic of Komi, Russia. Taxon Plantae, gymnosperms, angiosperms. Methods Two palaeoecological approaches are combined, based (1) on pollen (this study) and charcoal analysis (recomputed from our previous analysis) applied to cores from two peatlands and (2) on a REVEALS model (a part of the Landscape Reconstruction Algorithm "LRA") applied to six regional pollen cores in order to obtain a regional estimate of vegetation cover during the Holocene. Results The pollen diagram produced locally from Yaksha was compared with the regional vegetation cover determined by REVEALS. Taxa such asAbiessp. andPinusspp. showed differences between the two approaches, but vegetation signals remain qualitatively consistent. From 10,000 to 6,000 cal. yr BP, the forest was mainly a light taiga (composed ofPinus sylvestrisandBetulaspp.) and low fire activity was recorded. From 6,000 to 3,500 cal. yr BP, a dark taiga (composed ofPiceaspp.,Abies sibiricaandPinus sibirica) was established due to favourable climatic conditions, despite higher fire activity. From 3,500 cal. yr BP onwards, the continuous increase in fire activity allowed for a gradual return of light taiga,Betulaspp., likely reinforced by human activities. The dynamics ofPiceaspp. andAbies sp. were asynchronous between the sites. ForPiceaspp., the hypothesis of local inter-site expansion distributed along stream corridors is supported by the data. ForAbiessp., a bias in REVEALS, and in climate cooling may explain disparities between sites. Main conclusions We found evidence that in the early and mid-Holocene, vegetation dynamics were probably more influenced by climate, as fire activity was low. During the late Holocene, fire activity and geomorphology, eventually augmented by human activities, increased in influence on vegetation dynamics and led to the predominance of the light taiga forest up to the present.

中文翻译：

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乌拉尔地区北部（俄罗斯科米共和国）的针叶北方森林组成是否受到长期火灾控制？

目的 在区域尺度上记录过去的植被动态和火植被关系对于了解控制北方森林功能的机制是必要的，北方森林对气候变化特别敏感。本研究的目的是记录全新世期间科米共和国的这些相互作用。地点 俄罗斯科米共和国维切格达河流域夜叉。植物分类群、裸子植物、被子植物。方法 结合了两种古生态学方法，基于 (1) 基于花粉（本研究）和木炭分析（从我们之前的分析重新计算）应用于两个泥炭地的核心，以及 (2) 基于 REVEALS 模型（景观重建算法的一部分） LRA") 应用于六个区域花粉核心，以获得全新世植被覆盖的区域估计。结果将夜叉当地制作的花粉图与REVEALS确定的区域植被覆盖度进行比较。分类群如冷杉。和松属。显示了两种方法之间的差异，但植被信号在质量上保持一致。从 10,000 到 6,000 卡路里。在 BP 年，森林主要是一种轻型针叶林（由樟子松和桦木组成），记录到的火灾活动较低。从 6,000 到 3,500 卡路里。在 BP 年，尽管有较高的火灾活动，但由于有利的气候条件，建立了一种深色针叶林（由 Piceaspp.、Abies sibirica 和 Pinus sibirica 组成）。从 3,500 卡路里。从 BP 年开始，火灾活动的持续增加使得轻针叶林逐渐恢复，Betulaspp.，这可能是由于人类活动的加强。Piceaspp 的动态。和冷杉 sp. 站点之间是异步的。对于Piceasp.，数据支持沿河流走廊分布的局部站点间扩展的假设。对于Abiessp.，REVEALS 和气候变冷的偏差可以解释站点之间的差异。主要结论 我们发现证据表明，在全新世早期和中期，植被动态可能更多地受气候影响，因为火灾活动较低。在全新世晚期，最终被人类活动增强的火灾活动和地貌对植被动态的影响增加，并导致轻型针叶林的优势发展至今。植被动态可能更多地受气候影响，因为火灾活动较低。在全新世晚期，最终被人类活动增强的火灾活动和地貌对植被动态的影响增加，并导致轻型针叶林的优势发展至今。植被动态可能更多地受气候影响，因为火灾活动较低。在全新世晚期，最终被人类活动增强的火灾活动和地貌对植被动态的影响增加，并导致轻型针叶林的优势发展至今。