Main Tendencies in the Dynamics of Floodplain Ecosystems and Landscapes of the Lower Reaches of the Syr Darya River under Modern Changing ConditionsстатьяИсследовательская статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 22 апреля 2020 г.
Аннотация:The Aral disaster led to the almost complete loss of the Aral Sea. After the construction of the
Kokaral dam in 2005, it became possible to rescue the northern part of the Aral Sea (the Little Aral). Due to
natural (climatic) and anthropogenic causes, the flow of the Syr Darya River increased in the beginning of
the 21st century, its hydrological regime changed dramatically, spring-summer floods decreased, and winter
discharges significantly increased. All of these changes strongly affected the dynamics of floodplain ecosystems
and landscapes. A comprehensive assessment of current trends in the dynamics of ecosystems and landscapes
under changing environmental conditions was attempted in the study. The study was carried out based
on field material with data from remote sensing of the Sentinel 2 satellite, as well as climatic and hydrological
materials. The office and field data were analyzed according to the developed methodology developed by
J.V. Kuzmina and S.E. Treshkin for the assessment of transformations in ecosystems and landscapes from
natural and hydrotechnical disturbances. The main trends were established as follows: hydromorphic saline
formation for the second floodplain level of the river valley; a gradual decrease in the groundwater level,
accompanied by a gradual increase in soil salinization with depth and the absence of strong salinization at the
top for interstream delta depressions; the withdrawal of the territories from the flood regime without
increased soil salinization for the third floodplain level and floodplain terrace; the substitution of a typical
perennial grass stand due to its freezing and damping on an annual small weed grass due to winter discharges
for the depressions of the first and second levels of the floodplain.
Keywords: Syr Darya, spring–summer floods, winter discharges, floodplain, groundwater level, floodplain
ecosystems and landscapes, halophytic vegetation, soil salinization