UDC 556.06+556.13+631.6.02

Gusev E.M., Nasonova O.N., Kovalev E.E. CHANGES IN THE WATER AVAILABILITY OF THE TERRITORY OF RIVER BASINS LOCATED IN DIFFERENT REGIONS OF THE GLOBE, DUE TO POSSIBLE CLIMATE CHANGES // Arid ecosystems. 2021. V.27. № 3 (88). P. 3-15.

Received December 23, 2020. After revision February 01, 2021. Accepted April 01, 2021.

Scenario projections of changes in climatic water availability for vegetation (water availability index averaged over a climatic period (~ 30 years)), as well as changes in the variability of annual water availability for vegetation of the corresponding territories due to possible climate change in the 21st century for a number of large river basins of the globe, characterized by different natural conditions, were obtained using the land surface model SWAP developed at the Institute of Water Problems of the Russian Academy of Sciences. The ratio of the real annual transpiration to its potential value was used as an indicator of the water availability for plants. Eleven river basins (the Rhine, Tagus, Ganges, Lena, U. Yellow, U. Yangtze, Niger, Mackenzie, U. Mississippi, U. Amazon, and Darling) suggested within the framework of the International ISI-MIP project and located on different continents of the globe under different environmental conditions were used for the study. Meteorological forcing data to run the SWAP model were simulated by five General Climate Models (GCMs) for four climate change scenarios of the RCP-family up to the end of the 21st century.

It was shown that only five river basins (the Tagus, Ganges, Niger, U. Mississippi, and Darling basins) have the problems related to the water deficit. The other river basins are characterized by a humid and semi-humid type of climate, which will not change by the end of the XXI century. For the basins of the five abovementioned rivers, the change in the degree of their water availability due to possible climatic changes was analyzed in more detail. Changes in average (climatic) value of the annual water availability of these basins and in variability of water availability were investigated by means of construction of the integral distribution function of annual water availability for the historical and prognostic periods. It was shown that for the arid and semi-arid basins under study the degree of water availability by the end of the 21st century will be the same as for the historical period or even decrease.

Thus, for arid and semi-arid regions, the possible climate change in the 21st century will exacerbate the serious problem of the food security of mankind associated with the agricultural sector and water management. This problem will require an accelerated transition of human interaction with Nature to the principles of «green farming», which is based on application of nature-based technologies for using natural resources rationalizing the consumption of water, soil, energetic and other resources of the planet.

Key words: water availability of vegetation, river basin, evapotranspiration, climate change RCP-scenarios, hydrological and climatic modelling, arid areas.

Acknowledgments. The authors are grateful to everyone, who organized the Water Section of the International ISI-MIP Project on a regional scale, for the provided data and materials for the river basins studied in this work.

Funding. This work was carried out within the state assignment of Water Problems Institute of the Russian Academy of Sciences, Theme No. 0126-2021-0001 (state registration No. 121040700170-9) “Development of a Methodological Base and Digital Technologies to Support Decision-Making for Ensuring the Water Security of Crimea” and Theme No. 0147-2018-0001 (state registration No. АААА-А18-118022090056-0) “Study and Modeling of Processes of the Land Hydrological Cycle, Hydrophysical and Hydrodynamic Processes, Formation Patterns of Resources of the Surface Water, Soil Water and Groundwater under Changing Natural Conditions”, as well as with the financial support of the Russian Science Foundation, grant No. 16-17-10039 “Calculations and Forecasts (Including Assessment of Their Uncertainty) of the Water Balance Components of the River Basins Located on Different Continents of the Globe”.

DOI: 10.24411/1993-3916-2021-10158

UDC 57.045 574.24

Zelikhina S.V., Shartova N.V., Mironova V.A., Varentsov M.I. THE CLIMATE CHANGE IN THE EXPANSION RANGE OF WEST NILE FEVER IN RUSSIA: SPATIAL-TEMPORAL TRENDS EVALUATION // Arid ecosystems. 2021. V.27. № 3 (88). P. 16—23.

Received February 25, 2021. After revision March 01, 2021. Accepted April 01, 2021.

This work aims to estimate the spatial-temporal trends of climatic conditions changes for the spread of West Nile fever (WNF) in the south of the European part of Russia. We used observations data with 58 weather stations (1997-2018) and data the ERA-Interim reanalysis (1981-2018). We assessed the suitability of climatic conditions for West Nile virus (WNV) transmission using the degree-day method. Based on the data obtained, we demonstrate the growth of the sums of effective temperatures (ET). The increase in the duration of the season of effective infectivity of mosquitoes was not tracked down. The changes in the sums ET coincide with the increase in the average air temperature for the epidemiological season. This creates favorable conditions for the development of the virus in the mosquito, as with an increase in ET the circulation of the virus is more efficient. The most favorable situation for the transmission of WNV is in the Caspian and Ciscaucasia region. In this territory, there is a further improvement in the conditions for the circulation of WNF due to an increase in the sums of ET. Compared to the Urals region, conditions suitable for the transmission of WNV are developing much faster in the central part of the European territory of Russia. It may lead to the further spread of WNV in this region.

Keywords: West Nile fever, West Nile virus, climate, temperature, climate changes, degree-day method, climatic trends.

Funding. This work was carried out with the financial support of the Russian Science Foundation, Project No. 17-77-20070 “Assessing and Forecasting the Bioclimatic Comfort of Russian Cities under the Climate Change in the XXI Century”, and as part of the development program of the Interdisciplinary Scientific and Educational School of Moscow State University “The planet future and the global environmental changes”.

DOI: 10.24411/1993-3916-2021-10159

UDC 581.524.4 (571.52)

Namzalov B.B. THE MAJOR NODES OF A BIODIVERSITY AND PHYTOGEOGRAPHICAL PHENOMENA OF PLANT WORLD OF SOUTHERN SIBERIA // Arid ecosystems. 2021. V.27. № 3 (88). P. 24-36.

Received November 28, 2020. After revision March 04, 2021. Accepted April 01, 2021.

The most important nodes are distinguished as standards of plant biodiversity in various sectors of Southern Siberia: A – Saylyugem – Mongun-Taiga in Gorny Altai and Western Tuva; B – Sangilen-Darkhat in Southeast Tuva and Mongolia; C – Selenginsk-Daursky (Western Transbaikalia) in Buryatia. In the mountains of the Saylyugem ridge and Mongun-Taiga, there are many mountainous Central Asian species located on the eastern border of their ranges – the share of border species is up to 40% (Сoluria geoides, Potentilla lydiae, Allium pallasii, Lonicera microphylla, Artemisia obtusiloba  and others). This points to the historical links of this western sector of South Siberia with Middle and Central Asia. Endemic species that have the highest diversity index (60%) give originality to the flora of the Sangilen Highlands. The presence of boundary species as western and eastern geographic orientations, including Caragana jubata, Cymbaria dahurica, Echinops latifolius, Onosma gmelinii, Oxytropis tragacantoides, Lonicera microphylla and others, also indicate intense migration phenomena in the mountains of the Sangilen-Darhat node. The West Transbaikal node in the south of Buryatia, characterized by the presence of relics of the nemoral flora of East Asia, is of particular interest. These are Ulmus pumila, Armeniaca sibirica, Rhamnus erythroxylon, Filifolium sibiricum, Spodiopogon sibiricus, Saposhnikovia divaricata. According to this indicator, the flora of the Selenga Dauria has the highest level of diversity (40%).

The work reveals the features of floristic wealth and the diversity of the steppes of Transbaikalia and the Baikalia region, and the natural factors that cause them. It is shown, that this is a consequence of the ecotonic position of the territory (zonal-provincial), but also of the global climatic influence (Pacific, arid Central Asia). The complexity and variegation of vegetation in the steppes of Baikal Siberia gave us various interpretations of the boundaries of individual provinces and districts in geobotanical zoning schemes. The most complex is the vegetation of the steppes and forest-steppe of the Selenginsk midlands of Western Transbaikalia, which has been identified as a special buffer province.

Keywords: area, flora, endemic, relic and border species, nodes of biodiversity, Altai, Tuva, Western Transbaikalia

Funding. This work was carried out with the financial support of the Russian Science Foundation for Basic Research, Project № 15-44-04112р_Siberia_a – «Relict and endemic plants of Transbaikalia: analysis of populations state, ecological mapping of refugium and perspectives of genetic fund preservation», Project № 16-04-20813 – «Rare plants and phytocenoses of Baikal region and adjacent territories».

DOI: 10.24411/1993-3916-2021-10160

UDC 631.424.1

Grigorievskaya A.Ya., Gorbunova Yu.S., Devyatova T.A. DYNAMICS OF THE ECOLOGICAL STATE OF SOILS AND FLORA AFTER A FOREST FIRE IN THE EUROPEAN PART OF RUSSIA // Arid ecosystems. 2021. V.27. № 3 (88). P. 37—44.

Received March 10, 2021. After revision March 31, 2021. Accepted April 01, 2021.

The 10-year dynamics of the catalase activity of leached chernozem was studied in order to determine the intensity and direction of redox processes in the post-pyrogenic ecosystem located in the forest-steppe of the European part of Russia. The results of studying the Pinus sylvestris formation with the coordinates of the background north latitude are presented (N 52° 30ʹ 39.2ʺ, E 38° 57ʹ 30.3ʺ), pyrogenic (N 52° 30ʹ 37.3ʺ, E 38° 57ʹ 28ʺ) areas after a forest fire in 2010. The species composition of plants in forest formations was revealed by laying test plots 20×20 m² in size, within which 10 counting areas 1×1 m in size were described. The tiers were set according to the height of trees and grass stand. The plant communities are named by the method of listing the dominants established by the coverage. Abundance was counted according to O. Drude’s scale. Three phases of the restoration of the pyrogenic formation were identified: 1 – the phase of the ruderal phytocenosis (2010-2012), 2 – the phase of transformation of the ruderal phytocenosis (2014-2017), 3 – the initial phase of the restoration of the forest phytocenosis (2018-2020). Analysis of the catalase activity of the soil and the structural ecobiomorphological characteristics of the flora gives an opinion on the temporal aspect of the restoration of the forest ecosystem in the forest-steppe zone after a forest fire under conditions of moisture deficit. The absolute values of the regression coefficient of catalase activity in leached chernozem sharply decrease in the studied series of soils from background (0.42) to pyrogenic (0.15) and increase 10 years after the fire (0.23). Analysis of catalase activity and flora structure reflect the 10-year dynamics of the formation of a forest ecosystem with pyrogenic disturbance.

Keywords: flora, formation, pyrogenic and background site, catalase activity.

DOI: 10.24411/1993-3916-2021-10161

UDC 582.635.3(470.67)

Gabibova A.R., Gasainieva Z.A., Zalibekov M.D. ASSESSMENT OF POPULATIONS OF A RARE SPECIES OF COMMON FIG (FICUS CARICA L.) IN ARID CONDITIONS OF DAGESTAN // Arid ecosystems. 2021. V.27. № 3 (88). P. 45-51.

Received February 02, 2021. After revision March 26, 2021. Accepted April 01, 2021.

Figs (Ficus carica L.) are one of the oldest species of fruit trees grown in the world. The territory of Dagestan is the northern border of the distribution of figs. The protection of rare plant and animal species is justified by the value of these species as components of arid ecosystems, for the preservation of which it is necessary to know the reasons for their decline. A positive solution to these problems is seen in the study and development of new technologies for the conservation of the biodiversity of arid ecosystems. In this paper, we analyze the diversity of 14 morphological features. The results of the studies showed significant variability in all the studied natural habitats between fig plants. There are three groups of biomorphotypes, which appear depending on the growing conditions: 1) a tree with 2-3 trunks, up to 6-7 m high-Untsukul; 2) a shrub up to 3-5 m high – Dzhalgan and Dagestan Lights; 3) a shrub up to 1.5 m high-Sarykum and Oaks. Given that F. carica is listed in the Red Book of Dagestan (2009) and grows in this region at the edge of its range (the northern border of the species ‘ distribution). The study of its diversity is of great scientific and practical interest. The data of the conducted studies of the populations of the rare species F. carica in Dagestan, the assessment of its condition and recommendations for protection are of monitoring importance and are presented for inclusion in the latest edition of the «Red Book of the Republic of Dagestan».

Keywords: Ficus carica, fig, coenopopulation, variability, morphological diversity, red book species, rare species, species protection, Dagestan.

Funding. This work was carried out within the state assignment No. АААА—А19-119020890099-4 “Structural and Functional Features of Plant Communities with Populations of Rare and Resource Tree Species (on the Example of the Eastern Caucasus)”.

DOI: 10.24411/1993-3916-2021-10162

UDC 599.4:591.9:58.056(575)

Smirnov D.G., Khabilov T.K., Tojiboeva D.E. MODELING THE POTENTIAL DISTRIBUTION OF BARBASTELLA WALTERI (BARBASTELLA: CHIROPTERA, VESPERTILIONIDAE) IN THE CENTRAL ASIAN REGION BASED ON BIOCLIMATIC DATA // Arid ecosystems. 2021. V.27. № 3 (88). P. 52-60.

Received October 16, 2020. After revision January 14, 2021. Accepted April 07, 2021.

Barbaestella walteri is one of the rarest and poorly studied species of bats in Central Asia. The publication presents the results of hypothesis modeling of potential distribution of B. walteri in the Central Asian region using MaxEnt program. In the analysis the geographical coordinates of 57 sightings of the species and bioclimatic data from WorldClim2 database were used. The obtained model agrees well with the known locations. The distribution area does not show a continuous continuum, but consists of separate sites tied to the most optimal climatic parameters. These sites are confined to foothills and valleys along which the species penetrates mountains up to a height of 2500 m. In addition to the already known areas where the registration of the species is known, the model predicts a distribution in western Iran and eastern Turkey. Six bioclimatic parameters (isothermality, temperature seasonality, minimum temperature of the coldest month, average temperature of the driest quarter of the year, average temperature of the coldest quarter of the year, and precipitation of the warmest quarter of the year) proved to be the most important in constructing the model and made the maximum contribution (95%) to it. The interpretation of these parameters is consistent with the actually observed habitat conditions of the species. B. walteri demonstrates the highest probability of being found in areas where the climate is hot enough, with very little precipitation in the summer period, and in areas where the temperature in the coldest months rarely falls below zero.

Keywords: Вarbastella walteri, Central Asia, the potential distribution, simulation, MaxEnt.

DOI: 10.24411/1993-3916-2021-10163

UDC 631.48

Alichaev M.M., Sultanova M.G. IMPACT OF ENVIRONMENTAL CONDITIONS ON THE SOIL PROCESSES OF THE HIGHLANDS OF DAGESTAN // Arid ecosystems. 2021. V.27. № 3 (88). P. 61-65.

Received January 27, 2021. After revision March 22, 2021. Accepted April 01, 2021.

The article presents the materials of route, stationary soil, soil-ecological studies conducted in the high-mountain zone of Dagestan with the characteristic: a) the current features of the development of the soil cover; b) the ecological parameters of the soil cover and their changes under the influence of climate warming.

The variety of natural and economic conditions of the object of study caused a significant diversity of the soil cover. The distribution of the soil was greatly influenced by the height of the terrain, the exposure and the steepness of the slopes. Based on the soil erosion studies conducted in previous periods, it can be noted that improper land use and climate warming have led to radical changes in the composition of the soil cover in terms of determining indicators – soil erosion.

In recent years, the area of eroded land has doubled, the area with heavily eroded soils-by 1/3. This led to a decrease in the thickness of humus horizons in almost all soils to an average of 20 cm, and the loss of humus reserves in the soils amounted to 60% of the initial content. The presented analysis of the degradation of the soil cover and the established patterns of soil evolution on the slope lands of the highlands serve as a theoretical basis for the reproduction of soil fertility, the preservation of the ecological role of soil protection from erosion and other degradation processes.

Keywords: soil, fertility, erosion, exposure, highlands, vegetation, ecology, pastures, elevation.

Funding. This work was carried out within the state assignment No. 0733-2019-0005 “To Develop an Assessment System for Modern Trends of Soil Processes Development in Natural Landscapes of the Mountainous Province of the Republic of Dagestan”.

DOI: 10.24411/1993-3916-2021-10164

 

UDC 622.011:550.334

Idarmachev Sh.G., Cherkashin V.I., Idarmachev A.Sh. GENESIS AND GEOECOLOGICAL CHANGES OF SOUTH CASPIAN DEPRESSION AFTER METEORITE IMPACT // Arid ecosystems. 2021. V.27. № 3 (88). P. 66-71.

Received January 28, 2021. After revision March 25, 2021. Accepted April 01, 2021.

The article presents data confirming the theory of the meteorite origin of the South Caspian Basin, one of the largest reservoirs located in the arid climate zone. The theory in question was first proposed by Edmund Halley (1964). As a result of the disaster, the natural habitat of fauna and flora far beyond the Caspian Sea has changed. Arguments in favor of this hypothesis are not only geological, geomorphological data of the ring structure of the area, but also seismotectonic features. For the analysis, data from the IRIS seismic monitoring for the period 1970-2019 were used. The centers of earthquakes with a magnitude of M ³ 3.5 form the boundary between the northern and southern parts of the Caspian Sea, which coincides with the direction of the deep faults of the Caucasus-Kopetdag geological structure. On the territory of the Southern Caspian Sea, most earthquake foci are located along the coastal part, forming an annular structure, and are confined to areas of neotectonic contrasts that coincide with the faults of the coastal zone of the Caspian Sea. The central part of the South Caspian Basin is aseismic. As a result of the asteroid impact, the central part was compressed, and around it formed fractured zones of seismogenerating faults, permeable to the rise of deep fluids.

Keywords: ring geological structure, impact mechanism, Balakhani age, Akchagyl fauna.

DOI: 10.24411/1993-3916-2021-10165

  

UDC 551.583:631

Smagulov Ye.N. SPATIAL DIFFERENTIATION OF CLIMATE CHANGE IMPACT ON AGRICULTURE IN AKMOLA REGION // Arid ecosystems. 2021. V.27. № 3 (88). P. 72-80.

Received September 09, 2020. After revision January 18, 2021. Accepted April 01, 2021.

Long-term dynamics of average air temperatures and annual precipitation amounts confirms the reality of climatic changes that began in the 70th of the last century in the Akmola region that is one of the leading agricultural regions of Kazakhstan. Cultivation of cereals, in particular, spring wheat, which is known to be extremely sensitive to climatic and weather conditions, prevails in the structure of agricultural production of the region. Based on the analysis of climatic indicators for 1931-2019, according to the available data of meteorological stations, the intraregional features of climate change, which led to an increase in the yield of grain crops, were identified. Correlation analysis established a high dependence of yield on the climatic conditions of the warm period. With the preservation of the current level of farming culture and the continued growth of average temperatures, a decrease in yield is expected in dry-steppe and southern steppe regions of the region. In the northern steppe regions, more intense trends in climatic indicators of the cold months favor an increase in yields and an expansion of agricultural production. Further development of agriculture in Akmola region requires taking into account intraregional differences in the intensity of climatic trends. In order to avoid the negative consequences of climate change, it is proposed to introduce adaptation technologies, to diversify agricultural production, to develop organic agriculture and actively to support agricultural producers.

Keywords: adaptation, agriculture, agroclimatic resources, cereals, climate change, dry steppe zone, long-term dynamics, Northern Kazakhstan, steppe zone, yield.

Funding. This work was carried out as part of the Research Project of the Geographical Faculty of Moscow State University.

DOI: 10.24411/1993-3916-2021-10166

UDC 631.422

Belozubova N.Yu., Zubkova V.M. BIOGEOCHEMICAL ACTIVITY OF PASTURE PLANT SPECIES IN THE LEAD, CADMIUM AND ARSENIC UPTAKE UNDER CONDITIONS OF THE VOLGOGRAD REGION // Arid ecosystems. 2021. V.27. № 3 (88). P. 81-88.

Received September 05, 2020. After revision October 02, 2020. Accepted April 01, 2021.

Production of livestock products in the suburban areas of urban agglomerations, including in the Sarpinskaya lowland steppes – a territory favorable for animal husbandry, is economically profitable due to the proximity to produce processing and consumers.

At the same time, such zones are subject to the airborne technogenic impact of urban industrial enterprises, which are sources of heavy metals and arsenic entering the ecosystems (Belozubova, 2011). In this regard, the study of the distribution of pollutant elements in agrocenoses adjacent to industrial centers is becoming increasingly important.

The biogeochemical activity of plants belonging to the legume family (Fabaceae) – plaster clover (Melilotus officinális (L.) Pall.) and arctic clover (Melilotus albus (Medik.) H. Ohashi & Y. Tateishi), the family of cereals (Poaceae) – couch-grass (Elytrígia répens (L.) Nevski), desert wheatgrass (Agropýron desertorum (Fisch.) Schultes) and common reed grass (Phrágmites communis Trin.), the goosefoot family (Chenopodiaceae) – common orach (Átriplex patula L.) was researched.

A high degree of arsenic accumulation by the roots of all studied plants, except plaster clover (Melilotus officinális (L.) Pall.); the highest biogeochemical activity in the uptake of Pb, Cd and As by the aerial part of the common orach (Átriplex patula L.) and the roots of the desert wheatgrass (Agropýron desertorum (Fisch.) Schultes) were found.

Keywords: Volgograd Region, Sarpinskaya lowland, light-chestnut soils, pasture plants, pollution, heavy metals, arsenic.

DOI: 10.24411/1993-3916-2021-10167

 

UDC 631.435

Teymurov S.A., Imashova S.N., Ramazanov A.V. INFLUENCE OF AGGREGATION OF CHESTNUT AND MEADOW-CHESTNUT SOILS ON THEIR AGROPHYSICAL PROPERTIES IN THE TERSKO-SULAK PLAIN // Arid ecosystems. 2021. V.27. № 3 (88). P. 89-95.

Received March 11, 2021. After revision March 19, 2021. Accepted April 01, 2021.

The data of studying the physical properties of chestnut and meadow-chestnut soils are considered. The dependence of the density of the studied soils on both the size of aggregates and the features of the soil formation process is shown. In each particular case, this dependence is closely related to the genesis of soils and the peculiarities of their agricultural use. When considering the porosity of aggregates, estimated by the percentage of fractions, it is seen that the main share of interaggregate porosity in the studied soils is accounted for by large aggregates. The results of the obtained studies can be extrapolated to other areas of the soil cover of the studied area.

Keywords: soil structure, aggregate, density, porosity, genetic horizon.

Funding. This work was carried out within the state assignment No. 0733-2015-0002 “To Develop Methods of Fertilizers Usage (Green Manure, Straw, Manure) to Increase Soil Fertility and Corn Yield for its Grain and Grain Sorghum under the Irrigation of the Terek-Sulak Subprovince”.

DOI: 10.24411/1993-3916-2021-10168

UDC 631.41:579.26

Abdullabekova D.A., Magomedova E.S., Magomedov G.G., Kachalkin A.V. YEAST AS AN ELEMENT OF SOIL BIODIVERSITY AMPELOCENOSIS IN THE CONDITIONS OF ARID CLIMATE // Arid ecosystems. 2021. V.27. № 3 (88). P. 96-102.

Received January 27, 2021. After revision March 16, 2021. Accepted April 01, 2021.

The results of the study of the light chestnut soil of ampelocenosis located in the zone of the semi-desert-steppe regime with a low hydrothermal coefficient are presented. Analysis of the chemical composition revealed that the soil is non-saline, saturated with bases and has a deficiency of certain plant nutrients. The study of the taxonomic composition of yeast, which can act as a model group of microorganisms in the study of soil-microbiological processes, has shown the ability of this soil to play the role of a biological reservoir for storage and distribution in the natural cycle of various physiological groups of yeast. The yeast complex included 11 species: 2 – basidiomycetes, 9 –ascomycetes, among which the yeast Aureobasidium pullulans and Lachancea thermotolerans significantly dominated. The yeast was isolated in a direct and cumulative manner; the species identification of pure cultures was carried out on the basis of the analysis of the nucleotide sequences of the rDNA region. The accumulation of allochthonous yeasts, as well as other groups of microorganisms, affecting the biodiversity of the ampelocenosis soil, expands the potential for the participation of mycobiota in soil processes.

Keywords: soil yeast, physicochemical composition of soil, dry steppe zone, yeast complex.

Funding. This work was carried out with the financial support of the Russian Foundation for Basic Research, Grant No. 12-04-01222 “Study of the yeast biological diversity in connection with altitudinal-zonal differentiation (on the example of the plain, piedmont and mountainous territories of Dagestan)”, and the Russian Science Foundation, Grant No. 19-74-10002 «Endophytic Yeast of Crops: Monitoring of its Spread and Role in Plant Protection».

DOI: 10.24411/1993-3916-2021-10169

  

UDC 504.05/06

Rybka K.Y., Shchegolkova N.M. PERFORMANCE FEATURES OF CONSTRUCTED WETLANDS IN ARID AREAS // Arid ecosystems. 2021. V.27. № 3 (88). P. 103-110.

Received September 11, 2021. After revision March 31, 2021. Accepted April 01, 2021.

The article discusses the features of wastewater treatment in arid regions using constructed wetlands (CWs) – shallow artificial streams, planted with higher aquatic vegetation. It is known that due to the increased temperature, the efficiency of arid CWs is higher in some parameters compared to similar treatment systems in other climatic zones. However, arid wetlands have a number of features that have not yet been covered in the scientific literature. In this article, arid CWs are considered from two positions – from the point of view of the water budget of the system and the energy balance. It is shown that evapotranspiration becomes the main expenditure item of the water balance of CWs under arid conditions, which in some cases accounts for up to 70% of the total water loss in wetlands. At the same time, evapotranspiration is the main cooling mechanism for arid CWs. In conclusion, recommendations are given for the design of constructed wetlands in areas with a hot dry climate, aimed primarily at saving water resources. These include: the use of subsurface wetlands with vertical flow and artificial aeration, planting plants with minimal transpiration and the use of submerged macrophytes, planting trees around the perimeter of a wetland for shading and reducing wind speed, etc.

Keywords: wastewater treatment, arid constructed wetlands, arid areas, wetland water budget, wetland energy balance.

Funding. This work was carried out with the financial support of the Russian Foundation for Basic Research, Project No. 18-29-25027 “Influence of Taxonomic and Functional Diversity of Microbial Communities on the Purification Efficiency of Solid, Liquid and Gaseous Environments in Various Treatment Facilities”, Theme No. 0147-2019-0004 (state registration No.  АААА-А19-119040990079-3) “ Development of Scientific and Technological Basis for Integrated Water Resources Management and Protection of Water Bodies on the Territory of the Russian Federation” within the state assignment of Water Problems Institute of the Russian Academy of Sciences.

DOI: 10.24411/1993-3916-2021-10170

UDC 551.24

Magomedov R.A. GEOECOLOGICAL VALUE OF BLOCK POTENTIAL EASTERN CAUCASUS IN A DRY CLIMATE // Arid ecosystems. 2021. V.27. № 3 (88). P. 111-119.

Received December 11, 2020. After revision January 26, 2021. Accepted April 01, 2021.

The geodynamic potential of the blocks of the north-eastern segment of the Eastern Caucasus under the conditions of land ecosystems settling down is estimated and its geoecological significance is shown. Potential waiting areas for possible foci of strong earthquakes that can negatively affect the environmental safety in the region are identified. The conducted research is a continuation of the work on the assessment of the geoecological situation that develops under the influence of potential a natural catastrophic geological processes in the region that is subject to sedimentation and aridization.

Keywords: geodynamic potential, geoecology, safety, seismotectonics, zone of possible earthquake foci, quasi-homogeneous blocks.

Funding. This work was carried out within the state assignment No. АААА-А17-117021310201-9 «Study of catastrophic Geological Processes of Natural and Technogenic Origin in the Territory of the Eastern Caucasus».

DOI: 10.24411/1993-3916-2021-10171