Background During the last 100 years, rapid advances of trees towards higher elevations and latitudes have been recorded for various regions worldwide, including the Ural Mountains. Climate warming and tree cover increases can lead to significant changes in the high-mountain vegetation. Direct observations on the vegetation of high-mountain regions provide evidence for an increase in the species diversity of plants at high elevations and changes in the composition of the alpine communities. This study investigated the diversity and distribution of vascular plants within the present-day treeline ecotone in Mount Iremel, the Southern Urals. New information The dataset (Trubina and Nesterkov 2021, available from the GBIF network at https://www.gbif.org/dataset/284f1484-10b7-4ef5-87b7-9de1159e6b42) presents the results of an assessment of species richness and frequency of vascular plants at the different elevation levels (from 1203 to 1348 m a.s.l.) and different biotopes (birch-spruce shrub forest, birch-spruce sparse forest and spruce forest with fragments of meadow plant communities) within the treeline ecotone in Mount Iremel, Southern Urals. Observations were carried out at 700 sampling plots with two estimation methods: small-size plot (0.5 × 0.5 m) sampling (672 plots in total) and large-size plot (10 × 10 m) sampling (28 plots). The dataset includes 700 sampling events (= sampling plots), corresponding to 5585 occurrences (vascular plants, mainly identified to species) observed during July 2003. Only occurrences containing plant taxa (occurrenceStatus = present) have been provided. The dataset includes information about distribution and frequency of the Ural endemic species (Anemone narcissiflora subsp. biarmiensis (Juz.) Jalas, Calamagrostis uralensis Litv., Cerastium krylovii Schischk. & Gorczak., Festuca igoschiniae Tzvel., Hieracium iremelense (Elfstr.) Üksip, Lagotis uralensis Schischk, Pleurospermum uralense Hoffm.) and the Pleistocene relict species (Alopecurus magellanicus Lam., Bistorta vivipara (L.) Delarbre, Cerastium pauciflorum Stev. ex. Ser., Pedicularis oederi Vahl, Saussurea controversa DC., Swertia perennis L.). The dataset also provides information that can be useful for estimating biodiversity and plant communities composition within the treeline ecotone at a specified time period and contributes to the study of biodiversity conservation in the Ural Region.

中文翻译：

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伊雷梅尔山（俄罗斯乌拉尔南部）林线交错带内维管植物的多样性和分布

背景 在过去的 100 年里，包括乌拉尔山脉在内的世界各地都记录了树木向更高海拔和纬度的快速发展。气候变暖和树木覆盖率增加会导致高山植被发生显着变化。对高山地区植被的直接观察为高海拔植物物种多样性的增加和高山群落组成的变化提供了证据。本研究调查了乌拉尔南部伊雷梅尔山现今树线交错带内维管植物的多样性和分布。新信息 数据集（Trubina 和 Nesterkov 2021，可从 GBIF 网络获取，网址为 https://www.gbif。org/dataset/284f1484-10b7-4ef5-87b7-9de1159e6b42) 提供了对不同海拔高度（从 1203 到 1348 m asl）和不同生物群落（桦树-云杉灌木林）的维管植物物种丰富度和频率的评估结果、桦树-云杉稀疏林和云杉林与草甸植物群落碎片）位于乌拉尔南部伊雷梅尔山的林线交错带内。采用两种估算方法对700个样地进行了观测：小样地（0.5×0.5 m）抽样（共672个样地）和大样地（10×10 m）抽样（28个样地）。该数据集包括 700 个采样事件（= 采样图），对应于 2003 年 7 月期间观察到的 5585 次事件（维管植物，主要​​识别为物种）。仅提供了包含植物类群的事件（occurrenceStatus = present）。该数据集包括有关乌拉尔特有物种（Anemone narcissiflora subsp. biarmiensis (Juz.) Jalas、Calamagrostis uralensis Litv.、Cerastium krylovii Schischk. & Gorczak.、Festuca igoschiniae Tzvel.、Hieracium iremelense (Elfstr.) Üksip）的分布和频率信息, Lagotis uralensis Schischk, Pleurospermum uralense Hoffm.) 和更新世孑遗种 (Alopecurus magellanicus Lam., Bistorta vivipara (L.) Delarbre, Cerastium pauciflorum Stev. ex. Ser., Pedicularis oederi Vahl, Saussurea controversa DC., Swertia perennis L .)。该数据集还提供了可用于估计特定时间段内林线交错带内的生物多样性和植物群落组成的信息，并有助于研究乌拉尔地区的生物多样性保护。