Abstract

Assessment of the modern status of populations of rare plant species by population-ontogenetic methods is used for solving problems of conservation and restoration of natural communities. The object of the study is a rare species of the European Russia, Rindera tetraspis Pall., a poorly studied threatened steppe endemic. The purpose of the research was to assess the modern status and ontogenetic structure of cenopopulations of R. tetraspis in the Urals within Orenburg oblast. Three administrative districts of Orenburg oblast in the Urals were surveyed in 2016–2019, and as a result, six cenopopulations were identified and studied. Their phytocenotic allocation was assessed by conventional geobotanical methods. It has been revealed that wheat grass (Agropyron desertorum), wormwood (Artemisia lercheana)–Psathyrostachys calciphyte, and bluegrass (Poa bulbosa ssp. vivipara)–feather-grass (Stipa capillata) steppe communities predominate. The main population characteristics, the density of plants, and the ontogenetic composition, have been determined. The total density in the surveyed cenopopulations varies from 4.7 to 10.7 plants/m², and the effective density is from 3.2 to 5.9 plants/m². The ontogenesis has been described and eight ontogenetic stages have been revealed. Senile plants were not found. All the studied cenopopulations of R. tetraspis are normal incomplete and are dominated by middle-aged generative plants. According to the delta–omega classification, there are three are young, two transitional, and one mature cenopopulations. Their status is relatively satisfactory, but only one of the six is protected: it is located in the specially protected natural area Troitskie Melovye Mountains. Regular monitoring of the status of the populations is necessary for stronger protection of the species.

中文翻译：

---

Rindera tetraspis Pall 的个体发生和种群结构。奥伦堡州（紫草科）

摘要

通过种群个体发生方法评估珍稀植物种群的现代状况，用于解决自然群落的保护和恢复问题。该研究的对象是俄罗斯欧洲地区的一种稀有物种，Rindera tetraspis Pall.，这是一种研究很少的受威胁草原特有物种。该研究的目的是评估奥伦堡州乌拉尔地区R. tetraspis种群的现代状况和个体发育结构。2016年至2019年对乌拉尔奥伦堡州的三个行政区进行了调查，结果发现并研究了6个新种群。通过传统的地球植物学方法评估了它们的植物分布。研究表明，小麦草（Agropyron Desertorum）、艾蒿（Artemisia lercheana）- Psathyrostachys calciphyte 和早熟禾（Poabulboosa ssp. vivipara）- 毛草（Stipa capillata）草原群落占主导地位。主要种群特征、植物密度和个体发育组成已确定。调查的单胞种群总密度为4.7～10.7株/m ²，有效密度为3.2～5.9株/m ²。已经描述了个体发生并揭示了八个个体发生阶段。未发现衰老植物。所有研究的R. tetraspis的单细胞群体都是正常不完整的，并且以中年生殖植物为主。根据δ-omega分类，有3个年轻种群、2个过渡种群和1个成熟种群。它们的状况相对令人满意，但六处中只有一处受到保护：它位于特别保护区Troitskie Melovye Mountains。定期监测种群状况对于加强物种保护是必要的。