Abstract

Southern Ural is a unique region in Eurasia with a high variety of flora and vegetation. Mountain relief predominates in the steppe and forest-steppe landscapes. Stony habitats and petrophytic vegetation are widespread here. It is characterized by a high diversity of flora and numerous endemic, rare, and endangered plants. The dataset of 3614 relevés of forb and shrub communities from the territory of Southern Ural and adjacent regions is analyzed. Formalized methods of cluster analysis, an assessment of moistening using the ecological indices of plants, and the definition of indicator species are used. Patterns of changes in the species composition of petrophytic communities along the moistening gradient are determined. It is found that, with an increase in moisture, the number and cover of petrophytic species in communities on rocky habitats decreases. On the contrary, the role of indifferent species is growing. Five groups of species indicating different gradient segments are determined. Based on the results of cluster analysis, four large units of petrophytic vegetation are identified. Desert-steppe communities have the greatest floristic originality among vegetation on rocky habitats. Obligate petrophytes predominate in their diagnostic combination, many of which grow on limestone outcrops. These communities are found in the south of Orenburg oblast, mainly in the dry steppe landscapes of Southern Ural. Dwarf subshrub–bunchgrass steppes are widespread within the steppe landscapes and are common in the forest steppe of Ural. Forb–bunchgrass petrophytic steppes are widely represented in the northern part of the steppe zone and in the southern forest-steppe regions, as well as in the forest-steppe landscapes of Middle Ural. Meadow petrophytic steppes are found in forest-steppe and forest landscapes.

中文翻译：

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湿润梯度下乌拉尔南部和邻近地区石化植被组成的变化模式

摘要

乌拉尔南部地区是欧亚大陆上独特的地区，植物和植物种类繁多。在草原和森林草原景观中，以山地救济为主。石质栖息地和石化植被广泛分布在这里。它的特点是植物种类繁多，有许多特有，稀有和濒危植物。分析了来自乌拉尔南部和邻近地区的3614个灌木丛和灌木群落的相关数据集。使用了聚类分析的正式方法，使用植物的生态指标进行的湿度评估以及指示剂物种的定义。确定了沿湿润梯度的岩石群落的物种组成变化的模式。发现随着水分的增加，岩石生境中社区的岩石化物种的数量和覆盖率下降。相反，冷漠物种的作用正在增强。确定指示不同梯度段的五组物种。根据聚类分析的结果，确定了四个大的岩石物理植被单元。在多石的生境中，荒漠草原群落在植物群落中具有最大的植物创意。在诊断组合中，专性石粉体占主导地位，其中许多生长在石灰岩露头上。这些社区位于奥伦堡州的南部，主要位于乌拉尔南部的干旱草原景观中。矮灌木灌木丛草草原在草原景观中广泛分布，在乌拉尔森林草原中很常见。福布斯—草丛的岩石化草原广泛分布在草原区的北部，南部森林草原地区以及中乌拉尔森林草原景观中。在森林草原和森林景观中发现了草甸岩石圈草原。