Abstract

The dynamics of the botanical diversity of plain forbs–bunchgrass steppes is analyzed for the period of 2008–2018 based on materials from the biomonitoring of plant cover at the Tumentsogt experimental station (Eastern Mongolia) as part of the scientific program of an integrated Russian–Mongolian biological expedition. Eight permanent test plots of 100 m² were laid along the transect on the plain between hills in the northeastern part of the experimental station. We analyzed the correlation between the main parameters of the plant communities (the species composition, richness, and saturation; the height and abundance of species; and the density of grass stands) with the meteorological conditions (the heat supply and the amount and distribution of precipitation during the growing period). A combined analysis of phytocenotic and climatic data was performed with nonparametric multidimensional scaling of indirect ordination. Ecotopic fluctuations caused by changes in the amount and regime of precipitation in different years, as well as by the dynamics of the temperature regime, were studied. The species saturation of communities was maximal in years with low ombrothermic indices and lowest in years with high indices. The floristic composition of communities of three–feather-grass steppes includes a flora-cenotic core composed of 23 permanent perennial steppe and forest–steppe species, which provides a relative stability of ecosystems under changing environmental conditions. The dynamics of steppe ecosystems of the East Mongolian steppes is phytocyclic.

中文翻译：

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十一年期间（2008-2018年），蒙古东部的Forbs-Bunchgrass草原植物群落多样性的变化

摘要

基于Tumentsogt实验站（东部蒙古）的植物覆盖生物监测资料，作为俄罗斯综合农业科学计划的一部分，分析了2008年至2018年期间平原草–香茅草原的植物多样性动态。蒙古生物考察队。八个100 m ^2的永久测试区在实验站东北部的丘陵之间的平原上沿着样带铺设。我们分析了植物群落的主要参数（物种组成，丰富度和饱和度；物种的高度和丰度；以及草丛的密度）与气象条件（供热，水的数量和分布）之间的相关性。生长期的降水）。使用间接定序的非参数多维标度对植物盲和气候数据进行了组合分析。研究了由不同年份降水量和降水量变化以及温度变化引起的生态位波动。群落的物种饱和度在低体温指数的年份最高，而在高指数的年份最低。三叶草草原群落的植物区系组成包括一个由23种永久性多年生草原和森林草原草原物种组成的植物群落核心，这在变化的环境条件下提供了相对的生态系统稳定性。东蒙古草原的草原生态系统动态是植物周期的。