Архив рубрики: article-3-2022

USE OF HOLOCENE DEPOSITS OF THE SOUTH-EAST ROSTOV REGION TO ESTABLISH THE ANCIENT ANTHROPOGENIC ACTIVITY IN STEPPE REGIONS

Arid Ecosystems

UDC 550.4; 551.8 (925.22)

Idrisov I.A.,  Shishlina N.I. USE OF HOLOCENE DEPOSITS OF THE SOUTH-EAST ROSTOV REGION TO ESTABLISH THE ANCIENT ANTHROPOGENIC ACTIVITY IN STEPPE REGIONS // Arid ecosystems. 2022. V.28. № 3 (92). P. 107-116. | PDF

Study of the beam system of the rivers Sal and  Don in the south-east of the Rostov region of Russia allowed us to establish a significant area of distribution and a wide variety of Holocene deposits. They accumulated depending on the local features of various sites, the features of exogenous processes, landforms, the nature of soil-forming rocks and other factors. As a result of the study, Holocene deposits in negative relief forms (in the floodplain and the first floodplain terrace) formed by alluvial and deluvial processes with a certain role of

aeolian processes were identified; Holocene sediments of the second floodplain terrace of the end of the Khvalynsky stage of the Caspian Sea and the Novoevksinsky stage of the Black Sea; the intermediate form is Holocene sediments in saucer-shaped depressions. The history of accumulation of deposits on negative and positive relief elements is due to the presence of contrasting stages of environmental changes. The revealed Holocene deposits of different ages were confined to archaeological artifacts that record short-term habitats of mobile cattle breeders of different eras. They were found near identified Holocene deposits. This makes it possible to identify and further study the «invisible» sites of ancient man and obtain additional data on the anthropogenic impact on steppe resource areas in antiquity.

Keywords: paleogeography, Holocene, beam, soil, steppe, River Don.

Financing. The study was supported by the Russian Science Foundation, grant No. 21-18-00026 «Resources and humans in the Bronze Age and the Middle Ages: the dynamics of the use of arid regions of southern Russia» (research supervisor N.I. Shishlin).

DOI: 10.24412/1993-3916-2022-3-107-116

PECULIARITIES OF THE ANNUAL AND SEASONAL DYNAMICS OF THE ECOLOGICAL STATE OF THE SALINE LAKES LOCATED IN ARID CLIMATE IN CRIMEA

Arid Ecosystems

UDC 577.115.3+577.359

Rudneva I.I., Shaida V.G., Scherba А.V. PECULIARITIES OF THE ANNUAL AND SEASONAL DYNAMICS OF THE ECOLOGICAL STATE OF THE SALINE LAKES LOCATED IN ARID CLIMATE IN CRIMEA // Arid ecosystems. 2022. V.28. № 3 (92). P. 117-125. | PDF

On Crimea peninsula there are several unique lakes of different genesis, which characterize high quality recreational and balneological properties. These water bodies are impacted for anthropogenic activities, caused negative consequences for the  total ecosystem, including the lost of biological and hydromineralogical resources. At several cases, the water bodies located not far from each other greatly differ because of anthropogenic activity. For instance, Moinaky Lake is located at the west part of the Eupatoria city (Crimea), at present it is divided by the sand barrier in two parts namely Moinaky 1 (big part) and Moinaky 2 (small part). The aim of the present work was to study several physical and chemical characteristics of the water ( temperature, pH, Eh, salinity, oxygen  content) in both basins and the population state of brine shrimp Artemia salina at the period of 2018-2020. We studied the hydrochemical parameters of the water namely temperature, рН, oxygen concentration, salinity and Eh) monthly in both water bodies, divided by sand barrier. Seasonal dynamics of the tested parameters was characterized by the increase of salinity and Eh in summer period, accompanied with the increasing temperature of the air and water caused high insolation. Simultaneously, the concentration of the oxygen dropped and the insignificant decrease of pH was observed. The differences between the tested processes in both water bodies were shown, which were more clearly in Moinaky 2 as compared with Moinaky 1. Artemia cysts were found in both basins, while nauplia and adults were found only in Moinaky 2 at autumn and winter 2020, after dry period and restoration of the hydrological regime.

Keywords: hypersaline lakes, Crimea Peninsula, pH, Eh, salinity, oxygen content.

Financing. The work was carried out on the topic of the state assignment of the Moscow Hydrophysical Institute of the Russian Academy of Sciences 0555-2021-0004 «Fundamental research of oceanological processes that determine the state and evolution of the marine environment under the influence of natural and anthropogenic factors, based on observation and modeling methods» (cipher «Oceanological processes»).

DOI: 10.24412/1993-3916-2022-3-117-125