Arid EcosystemsPub Date : 2024-07-24DOI: 10.1134/S2079096124010128
E. V. Pinyaskina, A. T. Mammaev, M. Kh.-M. Magomedova, Z. M. Alieva
{"title":"Chlorophyll a Fluorescence as an Index Characterizing the Physiological State of Taraxacum officinale Wigg. under Conditions of Mountainous Dagestan","authors":"E. V. Pinyaskina, A. T. Mammaev, M. Kh.-M. Magomedova, Z. M. Alieva","doi":"10.1134/S2079096124010128","DOIUrl":"10.1134/S2079096124010128","url":null,"abstract":"<p>The results of a study of the photosynthetic efficiency, as well as the qualitative and quantitative composition of free amino acids in dandelion (<i>Taraxacum officinale</i> Wigg.) plants growing in Republic of Dagestan at various altitudes are presented. These complex studies show the high adaptability of dandelions to abiotic stress factors. As the altitude zoning increases, the efficiency of the solar energy transformation (Y(II)) in plants decreases due to photoinhibition (β and <i>Ib</i>). An increase in the relative rate of a noncyclic electron flow in the electron transport chain allows highland plants to maintain photosynthesis at the required level, thus providing the required energy balance and bioproductivity. Sixteen free amino acids have been identified in roots of <i>T. officinale</i>, including six essential amino acids that possess antioxidant properties. The amount of free amino acids varies depending on the zonality: the contents of α-alanine, arginine, methionine, serine, cysteine, threonine, and proline are higher in highland specimens. Altitude-associated changes in biophysical reactions and primary metabolites of the studied plants result from the impacts of abiotic factors and have an adaptive character.</p>","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2024-07-24DOI: 10.1134/S2079096124010062
I. N. Gorokhova, E. I. Pankova
{"title":"Organizational Problems of Soil Salinization Monitoring on Irrigated Lands","authors":"I. N. Gorokhova, E. I. Pankova","doi":"10.1134/S2079096124010062","DOIUrl":"10.1134/S2079096124010062","url":null,"abstract":"<p>Saline soils are a huge potential resource of the soil fund of the country, which may be used in agricultural production at present and in the future, if regular collection of system data on saline and solonetzic soils is arranged. The proposals of scientists for improving the monitoring of irrigated lands are aimed at the solution of this problem. Information of this kind is relevant for the development of measures to stabilize and restore soil fertility. The problems of the organization of salinization monitoring for irrigated soils in Russia are considered. The proposed approaches to its optimization are based on the integrated use of remote and terrain data and on our own research experience in Volgograd oblast. A comparative analysis of existing approaches to monitoring of saline soils in our country and abroad is given. The term of saline soils is defined. We show which soil layer should be analyzed for the presence of easily soluble salts to assign the soils, as well as solonetzes and solonetzic soils, to saline. The terrain monitoring performed by hydrogeological and reclamation parties, counting saline and saline-solonetzic soils on irrigated lands by terrain and analytical methods, should be supplemented with annual monitoring (during the spring–summer period) based on remote information for comprehensive survey. This approach will enable us to identify irrigated, rain-fed, and fallow lands in irrigation systems by satellite images; to supplement permanent terrain survey plots with sampling sites chosen by remote information; to identify areas with secondary soil salinization by the vegetation status on irrigated lands with a critical groundwater level and to take samples in them for analysis; and to reveal areas of saline-solonetzic soils on rain-fed lands and in the fields with noncritical groundwater levels by the vegetation status. All this will expand the database and characteristics of saline and saline-solonetzic soils and supplement the information obtained by hydrogeological and reclamation parties at permanent survey sites for better accounting of these soils.</p>","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2024-07-24DOI: 10.1134/S2079096124010104
A. A. Lushchekina, T. Yu. Karimova, V. M. Neronov
{"title":"The Current State of Kulan Populations (Equus hemionus Pallas, 1775) in Central Asia Countries","authors":"A. A. Lushchekina, T. Yu. Karimova, V. M. Neronov","doi":"10.1134/S2079096124010104","DOIUrl":"10.1134/S2079096124010104","url":null,"abstract":"<p>Even in the recent past, kulans (<i>Equus hemionus</i> Pallas, 1775) lived in the Eurasian steppes and deserts, from the eastern shores of the Mediterranean Sea to China. On the territory of Russia, the kulan was last encountered in 1926 in the Torey Lakes region, and in recent years the question has been raised about the possibility of reintroducing these animals into the Daursky Reserve. This review provides information on the current state of the Mongolian and Turkmenian kulan populations living in the countries of Central Asia (Kazakhstan, Uzbekistan, Turkmenistan, Mongolia and China) bordering Russia. Currently, in countries adjacent to Russia, autochthonous populations of the kulan have been preserved in the southern regions of Mongolia and adjacent parts of northern China, where the Mongolian kulan lives (<i>E.h. hemionus</i> Pallas, 1775). The largest population lives in Mongolia, where currently, according to experts, approximately 70 000 individuals are found (or 83% of the world population of the species). Almost half of the kulan’s range in Mongolia (42%) is located in nationally protected areas, but the size of existing protected areas, where kulans spend only about 23% of their time, is not large enough for the animals to be fully protected. The expansion of the network of protected areas to 30% of the country’s territory by 2030 suggests that the kulan, like other migratory ungulate species of the arid zone, have good prospects. About 80% (or just over 3000 individuals) of the kulan population in China currently lives in the Kalamaili National Nature Reserve in Xinjiang, making this protected area extremely important for the conservation of the species. In the 1930s, the kulans disappeared from Kazakhstan and Uzbekistan. In Turkmenistan the aboriginal population of the Turkmenian kulan was preserved until the end of the 1990s (<i>E.h. kulan</i> Groves and Mazák, 1967) in the Badkhyz Nature Reserve, but was most likely lost in recent years. A successful program for the reintroduction of kulans, which begun in the 1950s, and since the 1980s took on a larger scale, made it possible to preserve these animals (mainly in protected natural areas) within their historical range. In 2023, just over 30 kulan individuals lived in Turkmenistan in two areas with a total area of 800 km<sup>2</sup>: in the Tersakan river valley west of the borders of the Syunt Hasardag State Nature Reserve and on the territory of the Kaplankyr State Nature Reserve in the border zone. According to experts, it is very likely that in the near future the species will completely disappear from the country, since none of the indicated groups can be considered viable. The number of kulans living in the territory of the Saigachiy and Sudochye sanctuaries, as well as the Southern Ustyurt National Park in Uzbekistan, is currently estimated at 170 animals. Kulans are also actively breeding in the Jeyran eco-center. The reintroduction of kulans in Kazakhstan is progressing","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2024-07-24DOI: 10.1134/S2079096124010098
S. A. Lednev, A. V. Sharapova, I. N. Semenkov, P. P. Krechetov, T. V. Koroleva
{"title":"Biodiversity and Biomass Production of Plant Communities on Coal Mine Dumps in the Central Russian Forest–Steppe (Tula Oblast)","authors":"S. A. Lednev, A. V. Sharapova, I. N. Semenkov, P. P. Krechetov, T. V. Koroleva","doi":"10.1134/S2079096124010098","DOIUrl":"10.1134/S2079096124010098","url":null,"abstract":"<p>The dumps of the Moscow coal basin represent a long-term spontaneous experiment that reflects self-revegetation of a potentially acid soils by herbaceous and woody vegetation. This study investigated the biodiversity of vascular plants and the productivity of plant communities formed on coal dumps in the Tula oblast and described on 32 plots of 10 × 10 m. It was established that plant communities on the surface of the leveled areas of dumps are lower than background and sub-background meadows in both the number of species and reserves of aboveground phytomass. Meanwhile, according to the same parameters, the artificially restored vegetation formed during the reclamation of dumps have higher species richness and yielding capacity the background and sub-background meadows located outside the zones of influence of acid mine drainage from coal dumps.</p>","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2023-11-25DOI: 10.1134/S2079096123040182
I. V. Volkov, I. I. Volkova
{"title":"Are There Mountain Xerphytes in the Mountains of South Siberia?","authors":"I. V. Volkov, I. I. Volkova","doi":"10.1134/S2079096123040182","DOIUrl":"10.1134/S2079096123040182","url":null,"abstract":"<p>The regularities of biomorphological, ecological, and species differentiation of phytocenoses in the most arid southeastern sector of the Altai Republic reflect a tendency towards the local formation of a complete type of arid vertical zoning. This is typical for arid mountains of Central Asia and includes the following belts (from bottom to top): (1) dwarf shrub deserts, (2) communities of thorn cushion plants (mountain xerophytes), (3) high-mountain steppes, and (4) cryophyte cushion plant formations. The relatively wide spread of this zoning type (in areas with sufficient height of the mountains), including belts of thorn cushion plants and cryophyte cushion plant formations, requires the revision of traditional botanical–geographical concepts in order to increase the diversity of higher vegetation syntaxa and orobiomes both in the Southeastern Altai and in the mountains of South Siberia in general.</p>","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138438333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2023-11-25DOI: 10.1134/S2079096123040170
E. V. Vilkov
{"title":"Population Trends of Waterfowl on the Arid Coast of the Western Caspian During the Epoch of Climate Warming","authors":"E. V. Vilkov","doi":"10.1134/S2079096123040170","DOIUrl":"10.1134/S2079096123040170","url":null,"abstract":"<p>According to the data of 1995–2020 surveys conducted in the Sulakskaya and Turalinskaya lagoons on the western coast of the Caspian Sea in Dagestan, as well as according to information about the returns of bands obtained from the banding center of the Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, the geographic dispersion of migrating wader populations was determined, for ten species of which population trends were established. Of the ten model taxa, the abundance decreased in four, increased in two, and remained at the same level in four. There is a correlation between changes in air temperature in the Primorskaya lowland of Dagestan with average annual fluctuations in the abundance of the model group of birds. The dynamics of the number of migrating shorebird populations is determined by hydroclimate cycles, anthropogenic factors, and foraging. It is recommended to introduce a temporary ban on the hunting withdrawal of lapwing, herbalist, snipe and black-tailed godwit until their populations recover steadily.</p>","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138438331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2023-11-25DOI: 10.1134/S2079096123040108
N. M. Novikova, Zh. V. Kuz’mina, N. K. Mamutov
{"title":"Desertification of the Amu Darya River Delta and Vegetation Dynamics in the Conditions of the Aral Sea Crisis","authors":"N. M. Novikova, Zh. V. Kuz’mina, N. K. Mamutov","doi":"10.1134/S2079096123040108","DOIUrl":"10.1134/S2079096123040108","url":null,"abstract":"<p>This paper discusses the dynamics of ecosystems and their components in connection with the development of the Aral Sea environmental crisis. The theoretical basis of this study was the idea that the vegetation dynamics under the conditions of deltaic landscape desertification represents an anthropogenically-induced natural hologenetic process involving the replacement of vegetation typical for hydromorphic floodplain and reed-bed biotopes with vegetation of semihydromorphic meadow and solonchak biotopes resulting in the formation of zonal vegetation typical for automorphic biotopes. These endo–ecogenetic successions are determined by the directed reduction in moisture supply in biotopes and accompanying salinization and evolution of soils. The changes occur in both successional and catastrophic ways. In the northern, undeveloped part of the Amu Darya River delta, the reduction of the sea water surface and a sharp drop in water reserves resulted by the 1990s in the formation of environmental conditions typical for desert landscapes: the climate parameters and their regime became close to desert ones, while the groundwater level fell to a depth of 5–10 m, thus, making groundwaters inaccessible to plant roots. Reconstruction of the reservoir system and flooding of former marine bays contribute to the formation of hydromorphic conditions on local sites. Geobotanical studies commenced in the Amu Darya River delta in 1979 and involved route surveys and surveys of topo–ecological profiles passing through the main deltaic relief elements (levees, their slopes, and interchannel depressions) were repeated in the monitoring mode in 1985, 1993, and 1999. Route surveys performed in 2017 showed that the current vegetation dynamics stage involves the formation of desert plant communities. Black saxaul (<i>Haloxylon aphyllum</i> (Minkw.) Iljin) first discovered in the Muynak district in 1993 is actively spreading in the most part of the undeveloped delta that has turned into a wasteland after the extinction of common reed (<i>Phragmites australis</i> (Cav.) Trin. ex Steud.) communities in the 1970s–1980s. The desert species <i>Krasheninnikovia ceratoides</i> (L.) Gueldenst. that has invaded degrading tugai and sparse arborescent saltwort (<i>Salsola dendroides</i> Pall.) monocoenoses on takyr solonchak soils around the same years formed extensive thickets north of the city of Kungrad. Observations on topo–ecological profiles made it possible to examine individual changes and stages in more detail. On the right bank of the Akdar’ya River that feeds the Mezhdurechenskoe Reservoir, on the Porlytau topo–ecological profile located 3 km southwest of the upland of the same name, over the course of the 40-year observation period, the river washed away a section of the near-channel floodplain and levee 500 m wide and was incised 9 m into the ground following a drop in the erosion base level (i.e., water level in the eastern part of the Greater Sea) by 26 m. Plant com","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138438340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2023-11-25DOI: 10.1134/S207909612304011X
R. R. Omarov, K. Z. Omarov
{"title":"The Food Resource Status and Nutrition Selectivity in the Midday Gerbil (Meriones meridianus) in Arid Conditions of the Northwestern Caspian Region","authors":"R. R. Omarov, K. Z. Omarov","doi":"10.1134/S207909612304011X","DOIUrl":"10.1134/S207909612304011X","url":null,"abstract":"<p>In 2015–2018, a study was made of the species composition, productivity of the vegetation cover and the composition of the diet of midday gerbil in the arid zone of the Northwestern Caspian Sea region. Midday gerbils use all types of available food in their diet, but the food can vary significantly in percentage in different seasons of the year. Using the method of cuticular–scatological analysis, it was shown that in the spring the largest share in the diet of gerbils is made up by <i>Lapulla squarrosa</i> (K = 15.97), <i>Hordéum vulgáre</i> (K = 9.5), and <i>Medicago sativa</i> (K = 5.4) and in summer by <i>Poa bulbosa</i> (K = 12.3), <i>Amaranthus albus</i> (K = 3.5), and <i>Agropyron sibiricum</i> (K = 4.3). In autumn, high rates of selectivity are characteristic of <i>Poa bulbosa</i> (K = 13.2). In winter, midday gerbils feed mainly on the seeds of <i>Amaranthus albus</i> (K = 11.2) and <i>Agropyron sibiricum</i> (K = 2.5), as well as <i>Poa bulbosa</i> (K = 14.3). In winter, there is almost no selectivity in the diet of midday gerbils and they use all the food available at this time of the year. Basically, the diet of the gerbil is made up by xerophytic vegetation species.</p>","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138438401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2023-11-25DOI: 10.1134/S2079096123040169
V. I. Ubugunova, V. L. Ubugunov, E. B. Varlamov, S. N. Bazha, L. L. Ubugunov
{"title":"Peculiarities of the Mineralogical and Material Composition of Sands and Sandy Soils in the Cainozoic Deeps of Transbaikalia","authors":"V. I. Ubugunova, V. L. Ubugunov, E. B. Varlamov, S. N. Bazha, L. L. Ubugunov","doi":"10.1134/S2079096123040169","DOIUrl":"10.1134/S2079096123040169","url":null,"abstract":"<p>The characteristics of climatic, lithological and geomorphological conditions of formation of sandy soils of Transbaikalia (Barguzin basin) is given. It has been established that the main soil-forming processes are cryo- and light-humus, accumulative-carbonate and pale-metamorphic. In the soils of deposits, the processes of stratification and abrasion are expressed. Moving sands are not affected by soil formation, but with partial fixation of herbaceous and/or shrub vegetation on them, embryonic underdeveloped soils (layered-eolian, humus psammozems) begin to develop. For the first time, the results of the material composition of the rocks of the Angara-Vitim batholith, soil-forming sand, as well as the composition of minerals of fractions <1.1–5 and >5 µm of cryohumus and light humus soils are presented. It has been determined that the regional features of soil-forming sands are carbonation, alkalinity, and polymineral content, which is inherited from calc-alkaline rocks. The sandy and silty soil fractions have a similar mineralogical composition, which are characterized by a high content of plagioclases and K-feldspars and a low content of quartz. The composition of the silty fraction consists of a mixed-layer phase of illite-smectites interbedded with single chlorite packets, di-trioctadridic illite, ferruginous chlorite, and kaolinite. Modern soil formation is characterized by a low degree of chemical weathering (CWC, CWI, and GM) and weak profile differentiation. A feature of the material composition of sandy soils is an increased content of potassium and sodium. According to the values of total alkalinity, the studied soils are highly alkaline soils. There is a clearly pronounced division of the soil profile according to biological activity. It was revealed that during arable use, sandy soils are potential centers of desertification: in the studied area, all arable lands and fallows located on them are deflated to varying degrees. At the same time, it was found that more than 70% belong to very strongly deflated and strongly deflated types. In such areas, humus soil layers are blown out and carbonate horizons and even soil-forming sands are exposed. The exposed middle horizons and sands do not possess elements of effective fertility. The yield of agricultural crops on such arable lands is very low, the process of natural restoration of vegetation cover on fallow lands is extremely difficult, and deflation ulcers practically do not overgrow. The inhibition of the processes of restoration of natural cenoses is largely due to the alkalinity and carbonation of soil-forming sands.</p>","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138438402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arid EcosystemsPub Date : 2023-11-25DOI: 10.1134/S2079096123040133
Sh. U. Saribaeva, A. Allamuratov, B. Mavlanov, O. Mamatkosimov
{"title":"Assessment of the State of the Allium praemixtum Vved. Cenopopulation (Amaryllidaceae) on the Ridges of Uzbekistan","authors":"Sh. U. Saribaeva, A. Allamuratov, B. Mavlanov, O. Mamatkosimov","doi":"10.1134/S2079096123040133","DOIUrl":"10.1134/S2079096123040133","url":null,"abstract":"<p>This article presents the results of a study of the state of the cenopopulation of a rare species, <i>Allium praemixtum</i> Vved. in the Nurata and Turkestan ranges<i>.</i> The ontogenetic structure of the cenopopulation was studied by the generally accepted methods (Uranov, 1975; <i>Tsenopopulyatsiya rastenii</i>…, 1976). Cenopopulations were characterized according to the classifications of A.A. Uranov and O.V. Smirnova (1969) and “delta–omega” (Zhivotovsky, 2001). The ecological density was determined by the method of W. Odum (1986). Geobotanical descriptions were made according to the standard methodology on sites of 100 m<sup>2</sup> (Field geobotany, 1964). The characteristic ontogenetic spectrum is left-sided, with an absolute maximum in one of the pregenerative groups (Cheremushkina, 2004). Cenopopulations (CP) 1, 5, 6 correspond to the characteristic left-sided ontogenetic spectrum with a maximum peak in the virginal state of the species. The centered ontogenetic spectrum does not coincide with the characteristics, culminating in middle age. The bimodal ontogenetic spectrum is then considered as a temporary left-sided variant with an equal peak in the medium generative and virginal states. The density of individuals in the studied cenopopulations varied from 1.1 to 9.7 ind./m<sup>2</sup>, and the ecological density is from 2.3 to 17.63 ind./m<sup>2</sup>. According to the “delta-omega” classification Allium praemixtum cenopopulation CP 1 is maturing, CP 5 and 6 are young, CP 2 and 4 are transitional, and CP 3 is mature. Existing cenopopulations are mainly located on unprotected territory, with the exception of CP 3 (near Mazhrumsay) and 4 (near Gurdarasay). The only solution to this problem can be the strict protection of cenopopulations.</p>","PeriodicalId":44316,"journal":{"name":"Arid Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138438407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}