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Trans-Volga–Trans-Ural Steppes of the Northern Subzone of the Steppe Zone: Features of Modern Formation Diversity
Arid Ecosystems Pub Date : 2020-10-28 , DOI: 10.1134/s2079096120040174
I. N. Safronova , O. G. Kalmykova , N. Yu. Stepanova

Abstract

A significant part of the natural Trans-Volga–Trans-Ural Steppes in the northern subzone has been destroyed by plowing. At the same time, they are represented over a rather large area by deposits of different ages. It is known that communities of many formations are distributed throughout the steppe zone. The differences in the structure of undisturbed communities in different subzones are quite clear. These differences hard to distinguish on deposits and pastures. Having studied the vegetation cover of the steppe zone for many years, we set a task in 2018 and 2019 to identify the way in which the formation diversity changes on deposits and the extent to which the deposit structure can be used to assess the subzonal status of the territory. The studies were carried out with the route method. More than 150 geobotanical releves were made according to the standard method with reference to coordinates. The ecological–phytocenotic classification was used for the analysis of releves. More than 1000 herbarium sheets with reference to coordinates were collected. Instead of zonal Stipa zalesskii steppes Stipa capillata steppes currently dominate being the background vegetation on the deposits in the Trans-Volga–Trans-Ural part of the Northern subzone.Along with steppes of Stipa capillata, secondary steppes of Stipa lessingiana occupy large areas. A peculiar component of the vegetation cover of the northern subzone is created by dwarf semishrub communities. They are confined to saline soils or rock outcrops. Halophytic and petrophytic variants of the steppes are represented not only by dwarf semishrub communities but also by perennial forbs. New data on the distribution of a number of rare species were obtained in the course of the floristic research.



中文翻译:

草原带北部子区域的跨伏尔加河与跨乌拉尔草原:现代地层多样性的特征

摘要

北部分区的大部分自然跨伏尔加河-反乌拉尔草原已经被耕作破坏。同时,它们在相当大的范围内被不同年龄的沉积物所代表。众所周知,许多草原地区分布着许多地层。不同分区中未扰动群落的结构差异非常明显。这些差异很难区分沉积物和牧场。在研究了草原地区的植被覆盖物多年之后,我们在2018年和2019年设定了一项任务,以确定沉积物的地层多样性变化的方式以及沉积物结构可用于评估亚喀斯特亚带分区状态的程度。领土。研究是通过路径法进行的。根据标准方法并参考坐标,制作了150多个地质植物学版本。生态-植物群落分类被用于分析物种。收集了1000多个参照坐标的植物标本室表。代替区域针茅扎莱斯蒂草原茅立茅草原目前占主导地位,是北部次区域的跨伏尔加河-反乌拉尔部分沉积物的本底植被。除了针茅茅列草原外,次生针茅草原也占较大面积。矮子半灌木群落为北部分区的植被提供了一个奇特的组成部分。它们仅限于盐渍土壤或岩石露头。草原的盐生和石质变种不仅以矮半灌木群落为代表,而且还以多年生草本植物为代表。在植物研究过程中,获得了一些稀有物种分布的新数据。

更新日期:2020-10-30
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