Home – Home – Jornals – Flora and Vegetation of Asian Russia 2024 number 2

An expert assessment of the accuracy codes for the intensities of rovibrational transitions of water vapor in the spectral range 2500-6500 cm^-1 of the HITRAN2020 database has been carried out. From comparison with experimental data, the normalization coefficients of the variational calculation by Conway E.K., Gordon I.E., Kyuberis A.A., Polyansky O.L., Tennyson J., Zobov N.F. // J. Quant. Spectrosc. Radiat. Transfer. 2020. V. 241. P. 106711 were determined; for the absorption bands (001)-(000), (020)-(000), (011)-(000), and (110)-(000), they were 1.010, 1.007, 1.013, and 1.030, respectively. Using variational calculations and modeling based on the effective Hamiltonian approach, the analysis of experimental data from the HITRAN2020 database has been conducted, revealing less accurate values. Based on these results, an adjusted list of H₂¹⁶O absorption lines in the range 2500-6500 cm^-1 has been constructed, which can be useful for natural experiments.

The influence of two factors on the contour of an absorption line of water vapor molecule in a mixture with helium, argon, krypton, and xenon is studied: the dependence of the broadening coefficients γ and shifting coefficient δ on the velocity ν_a of the absorbing H₂O molecule (wind effect) and the change in the velocity of H₂O upon collision with these atoms. Three absorption lines of H₂O molecule from n₁ + n₂ + n₃ band with different rotational quantum numbers of the initial quantum state were chosen for the study.

The results of long-term measurements of the atmospheric turbulence characteristics in the Sayan Solar Observatory (SSO) in summer 2023 are presented. It is confirmed that the cause of the prevailing direction of local winds appearing in SSO is temperature mountain-valley gradient between the Sayan Mountains north of the SSO observatory and the valley to the south. A smaller level of the mean intensity of atmospheric turbulence in SSO compared to the turbulence over flat terrain in middle latitudes is confirmed. The presence of coherent turbulence in the SSO area is shown, at which the quality of images obtained by optical instruments is improved. New data are obtained for the turbulent scales of temperature and wind speed depending on the atmospheric stratification.

The impact of PM_2.5 in urban air on the frequency of hospitalizations for respiratory diseases is studied based on data on the atmospheric PM_2.5 concentration from the TOR station (Tomsk) and on the number of hospitalizations of Tomsk residents for respiratory diseases and coronavirus infection (ICD-10 codes J00-J99, U07.1, and U07.2) from the register of emergency calls over a twelve-year period (2010-2022). It is shown that the level of air pollution with PM_2.5 and the duration of pollution episodes almost do not affect the number of hospitalizations for respiratory diseases in the absence of infectious agents, which increase the number of such hospitalizations. However, in the cases where infectious agents, including SARS-CoV-2, are present in urban air, which promotes an increase in the number of hospitalizations for respiratory diseases, fine aerosols as carriers of the infectious agents contribute to their faster transfer and infection of more city residents compared to the cases of clean air. During such episodes, relatively low PM_2.5 concentrations (30-50 μg/m³) can several times increase the number of hospitalizations for respiratory diseases, including coronavirus infection, even in such a fairly clean city as Tomsk, ignoring the rise of the number of hospitalizations due to seasonal morbidity or epidemic.

In this article, we have calculated light backscattering by large irregularly shaped particles with random orientations. We have utilized the physical optics approximation to analyze this phenomenon. Our findings demonstrate that there is a distinct polarization surge in the degree of linear polarization, which arises from coherent backscattering. The sign of the polarization surge for pairs of conjugate beams can vary, being either negative or positive, depending on the light beam trajectorie which significantly contribute to the backscattering process. By summing up these surges, we have concluded that the well-known phenomenon of negative polarization not necessarily occur when a single particle scatters light in the vicinity of the backscattering direction.

A flight experiment was carried out in which turbulence was sounded with the UV lidar BSE-5 from the Tu-134 Optik laboratory aircraft. The experiment was conducted in September 2022 as part of the Arctic exploration program. During the flights, lidar recorded zones of moderate turbulence in the lower troposphere, where the probability of turbulence is maximal, and isolated cases of clear air turbulence (CAT) at an altitude of 9 km. The intensity of the aircraft shaking was monitored using a 3-coordinate accelerometer. It was found that the turbulent lidar can be used in practice for remote detection of turbulent zones at altitudes where most commercial flights are carried out. The prospect of ground-based application of turbulent lidar for solving aviation safety problems during flights in the lower troposphere is shown. The results of the BSE-5 lidar sounding in winter, when an increase in the intensity of turbulence in the 0.4-1.6 km layer was recorded during the passage of a cold front, are presented.

The article discusses some characteristics of the propagation of atmospheric waves based on photographic observations of noctilucent clouds in the city of Yakutsk. For the first time, a case of observation of the so-called mesospheric boron in noctilucent clouds over Eastern Siberia, recorded synchronously with two cameras of the same type, has been described. The height of the wave front determined by the triangulation method was 79 km. The case of video recording of the propagation of several waves of different lengths with intersecting directions in noctilucent clouds on July 25, 2018 is analyzed. Analysis of the parameters of two waves propagating towards each other showed that the first has average wavelength of 53.5 ± 6.2 km, average phase velocity of 98.4 ± 12 m/s, and northeast direction. The second wave of the scallop type propagated to the southwest with an average phase velocity of 61.5 ± 6 m/s, its average wavelength was 14.8 ± 1.8 km. The speed of westerly wind drift of all clouds was 67 ± 5 m/s.

The influence of aerosol particles on the parameters of the global atmospheric electrical circuit is among important issues of the theory of atmospheric electricity. This paper presents a theoretical model of the effect of aerosol particles on the global atmospheric electrical circuit (GEC) under the fair weather. Surface aerosol is considered as a summand in the total atmospheric columnar resistance. Electric field generators which support the GEC are taken into account through the boundary condition as specified ionospheric potential. In addition to the theoretical model, experimental observations of electrical characteristics of the atmosphere and of the aerosol concentration are presented. The theoretical and experimental studies make it possible to estimate the concentration of submicron aerosol particles.

The processes of planetary wave breaking (Rossby Wave Breaking - RWB) significantly contribute to variability in stratospheric circulation. Employing a previously developed method for identifying RWB, adapted for stratospheric circulation, this study analyzes the climatology and long-term variability of RWB processes in the middle stratosphere. The method is based on the analysis of potential vorticity (PV) contour geometry at the 850-K level using ERA5 data within the PV range 0-400 PVU (Potential Vorticity Units) determined based on PV field climatology. It was demonstrated that RWB processes exhibit intraseasonal peculiarities. Most frequently, waves break in the northern regions of East Asia and the Pacific Ocean from October to December and in April to March. In January and February, no areas with prevailing RWB processes were identified. We obtained statistically significant increase in the number of RWB for the first half of winter (October-December) and for the end of the winter period (March and April). For mid-winter (January and February), insignificant negative trends were obtained.

The influence of early sudden stratospheric warming (SSW) on the stratospheric polar vortex is presented. The definition of SSW and their classifications have been formulated for a long time, but detailed information is not available about the early (in November - the first half of December) SSW. The determination of early SSW was carried out in two ways using the zonal averaged values of temperature and zonal wind component with and without the climatic component. The polar vortex's response to warming is represented by the geopotential height field. The study was conducted using JRA-55 and Merra2 reanalysis data. Also, the variation of surface temperature and surface pressure during the displacement and splitting of the stratospheric polar vortex during the early SSW is presented based on sounding data at stations of the polar region of different continents. It is known that the VSP has a significant impact on the weather in the troposphere, including the dynamics of the upper atmosphere.

The paper considers the possibilities of taking into account data from lightning networks in the procedure for lightning data assimilation in numerical models of atmospheric dynamics. A universal procedure is proposed and the code is implemented within the framework of the WRF-ARW model. According to the data from lightning detection networks, the cells of the computational grid are determined, in which lightning was recorded. Then moisture is iteratively added in these cells until the occurrence of thermodynamic instability and, hence, convection. The effect of using this scheme on the forecast of precipitation, temperature, and humidity is studied, and a comparison is made with other lightning assimilation methods. The use of data from lightning detectors makes it possible to locally improve the forecast of heavy precipitation and temperature in areas where thunderstorms were observed. The Piercy-Obukhov coefficient for forecasting intense precipitation using the proposed procedure increases from 0.26 to 0.40.

Temperature data at weather stations in the Northern Hemisphere and astronomical insolation data are ordered by increasing latitude and analyzed together for different samples between 1897 and 2010. By step-by-step regression of the latitudinal variation in the long-term average temperature to a polynomial of astronomical insolation, a latitudinal temperature trend determined by the Sun and fluctuating regression residuals, in which individual features of data appear, are identified. The absence of interaction of these components is numerically achieved for any samples. It has been established that in the Northern Hemisphere for the available samples, the latitudinal trend in the long-term average temperature completely determines the warming and contributes about 82% to the total temperature dispersion. The boundaries of areas where temperatures are above and below the latitudinal trend in the long-term average temperatures reveal known geographic structures, thereby verifying the trend.

Results of studying interaction of two colliding axisymmetric laminar microjets of hydrogen in the course of their diffusion combustion are reported. Gas exhaustion occurs with identical velocities through pairs of micronozzles, which are thin-walled cylindrical tubes with an inner diameter of 200   m. The transverse positions of the tubes with respect to each other are changed during the experiment. Specific features of flame formation from two interacting microjets are found for different transverse positions of the tubes, and the results are compared with flames of single microjets with the same exhaustion velocity.

This study is aimed at understanding some characteristics of the shock wave generated by a novel composite charge consisting of an inner high explosive, a medium non-detonating layer, and an outer aluminized explosive. The influence of the shell restraints and initiation modes on the peak overpressure and impulse of the charge is investigated. Numerical models are developed based on the mapping function of AUTODYN for determining the spatial distribution of the shock wave overpressure. By means of validation experiments, the accuracy of the developed model is verified. It is found that the peak overpressure and impulse obtained from experiments and simulations are in good agreement, with a deviation of less than 16.9%. The difference in the overpressures at various azimuths decreases with increasing distance, and the shock wave profile eventually evolves into a spherical shape. The radial overpressure of the shelled composite charge is initially greater than that in the axial direction and decays rapidly with increasing distance. The azimuth corresponding to the maximum peak overpressure is shifted from 75oC for the bare charge to 110 °C for the shelled charge. It is found that the energy utilization of the composite charge under inner initiation is apparently smaller than that under simultaneous initiation.

The countercurrent flow of a falling liquid film and a turbulent gas flow in a narrow vertical channel is considered. In the case of small Reynolds numbers and when certain conditions are met for the parameters of such a flow, the problem reduces to the study of one evolutionary integrodifferential equation for the deviation of the film thickness from the unperturbed level. A numerical study of the evolution of periodic disturbances has been carried out. Several solutions to the model equation are presented

A mathematical model is proposed that describes the formation of internal hydraulic jumps and the mixing of co-directed flows of an ideal stratified fluid in the Boussinesq approximation. The model is based on a three-layer representation of the flow taking into account the entrainment of fluid from the outer layers into the intermediate vortex layer and is represented as a system of heterogeneous conservation laws. The speed of entrainment is given by the equilibrium condition within the framework of a more general model of evolution of the mixing layer. The speed of propagation of disturbances and the concepts of subcritical and supercritical flows are formulated. It is shown that the model is suitable for describing the mixing and splitting of flow in deep-sea currents. Solutions corresponding to the flow around an obstacle with the formation of an internal hydraulic jump and a region of intense mixing were constructed. The results of numerical modeling were shown to be in good agreement with experimental data.

Results of studying gas flows in a setup used for cold gas-dynamic spraying are reported. The setup consists of a cylindrical inlet channel with a central rod connected at a right angle with a rectangular slotted channel. Injection of a high-pressure gas through the inlet channel leads to gas acceleration. It is shown that there are velocity and pressure disturbances in a supersonic overexpanded jet exhausting from the channel, which arise due to the presence of compression and expansion waves, as well as streamwise vortices. The contribution of streamwise vortices to pressure and velocity disturbances is approximately 30%. Streamwise vortices are formed at the entrance of the slotted channel owing to curvature of streamlines.

A method for controlling the physical and chemical properties of a formation in order to increase its oil recovery by injecting an acid composition GBK-F into the formation is being considered. An experimental setup has been created for physical modeling of the effect of the composition on an oil reservoir. Experiments were carried out on a flat model with a single injection of the reagent into the central well. The experimental results confirmed the effectiveness of the composition

A two-dimensional exact analytical solution of the thermal field developed during the submerged arc welding process with visualization of the thermal surface contour for analyzing the heat flow in the domain with the hybrid application of Duhamel's theorem and finite integral transform approach is obtained. The thermal field arising in submerged arc welding of thick EH36 steel plates is studied. An ellipsoidal heat source model is assumed. The developed thermal field is investigated with variations of several process parameters, such as the heat source velocity, heat input, and lag time of movement of the heat source involved in the welding process.

In this study, the effect of patient's physical activity in terms of the heart rate on the growth of the thoracic aortic aneurysm (TAA) is studied. Using medical images of the patient, a patient-specific geometry model is constructed. Then the hemodynamic parameters of the blood flow are numerically analyzed for different heart rate conditions. The simulation results show that the maximum wall shear stress, the maximum velocity, and the maximum pressure during a cardiac cycle increase by 19.1, 12.7, and 50%, respectively, as the heart rate increases from 60 to 174 beats per minute. Results also indicate that an increase in the heart rate leads to reduction of the time-averaged wall shear stress and simultaneously to an increase in the wall shear stress oscillations. According to the literature, these hemodynamic conditions are undesirable and can increase the likelihood of aneurysm development and aortic rupture.

The behavior of material under surface laser processing conditions is described taking melting into account. A Maxwellian type is presented that takes into account the change in heat capacity and viscosity with a change in temperature and material composition. This model is used as the bases to develop a model for the change in the properties of a flat layer material using a moving heat source. An algorithm for the numerical solution of the formulated problem is described. Examples are presented to show the effect of heat loss, cohesion, melting, chemical reactions and their acceleration due to the work of stress on the properties of the material

The results of a study of the influence of compaction pressure on the characteristics of radiation-protective composites based on polyethylene and boron carbide B₄C are presented. Using software modeling, the temperature range for heating a mold of a given size was selected. The required holding time of the composite was determined experimentally, and defects that arise from various deviations from the optimal temperature parameters were identified. The results of testing the strength of samples under various pressing pressure conditions are presented, and the optimal pressure value is found. A composite was obtained with the following mechanical characteristics under optimal pressing conditions: density (1.09 ± 0.01) g/cm³, bending strength (5.72 ± 0.18) MPa, sound velocity in the composite (2050.00 ± 0.01) m/s

It is proposed to use the relations of the endochronic theory of thermoplasticity to describe the nonlinear deformation of isotropic materials under non-isothermal loading. A variant of the governing relations in integral and differential form for the general loading case is given. Analytical dependences for a number of material parameters of the model were determined based on the results of uniaxial tension (torsion) tests. A numerical algorithm based on the Euler method with an internal iterative process implemented by the Seidel method is proposed to analyze the governing relations. An example of numerical calculation of the uniaxial tension of a rod under complex thermal force loading. It is shown that the calculation results are in satisfactory agreement with the results obtained using isotropic hardening flow theory

The problem of constrained torsion of thin-walled rods under the action of an end torque is considered. Using the asymptotic splitting method, a system of resolving equations was obtained that describes the combined torsion, tension-compression, and bending of the rod. To test the resulting model using the example of typical sections, a comparison was made of the stress-strain state in the rod, determined in the calculation using the developed model and three-dimensional numerical calculation by the finite element method. The resulting mathematical model was analyzed and its advantages compared to the widely used Vlasov theory were revealed. It is shown that the developed model does not contain the restrictions imposed by the hypotheses in the Vlasov theory, such as the non-deformability of the transverse contour and the absence of shear deformations on the middle surface. In a number of cases, the resulting model makes it possible to more accurately determine the emerging stress-strain state. In particular, it is shown that the developed model takes into account the presence of a boundary layer near the embedment, which arises during torsion of corner sections and makes a significant contribution to longitudinal stresses, while Vlasov’s theory does not allow one to restore the arising longitudinal stresses

A method of determining the dynamic yield strength of heterogeneous materials is proposed, based on comparisons of the processes of cavity formation in the reference and examined materials. A series of computations is performed for penetration of an extended rod into homogeneous and heterogeneous massive targets. A nonmonotonic dependence of the penetration depth on the motion velocity is derived. The yield strength limit of a heterogeneous medium is obtained from the analysis of computation results in the coordinates of the specific kinetic energy of the rod and the work of stresses on plastic strains.

Using the grid-characteristic numerical method on grids of tetrahedrons, wave processes in a composite material are simulated under the action of a pulsed shock load. An approach is proposed to increase the order of approximation of the method on an unstructured mesh in the three-dimensional case. The results of calculations of the propagation of a load impulse in a three-layer composite are presented

A two-layer rod with a box section twisted under the action of tangential stresses at angle θ is considered. It is assumed that the deformations in the rod are elastic and its lateral surface is stress-free. The layers have different elastic properties and different thicknesses. The layer contact line is assumed to be rigid, i.e., the stresses on it coincide. An exact solution describing the stress state of the given structure is constructed using conservation laws. The stress state is determined at each point of the cross section using integrals over external contours

A simplified numerical method for simulating the penetration of projectiles into fabric targets is proposed which takes into account the type of fabric weaving, the friction forces between the fibers and between the projectile and the fabric, and the transverse dimensions of the fabric. The necessary calculated parameters were selected from a comparison of experimental and calculated data. The proposed method was used to estimate the ballistic resistance of a combined protective composition required to reduce the armor impact. The problem of the nfluence of the projectile shape on the ballistic resistance of fabric armor protection

A brief overview of experimental approaches to the study of the tribology of sliding of various bodies on snow or ice is presented, and a model and a digital twin of a tribological device is proposed. The deformation distribution of a tank with snow rotating at a target speed was obtained by modeling, and the work done by the friction force per sliding cycle was determined by testing the movement of a ski sample on a flat snow surface. The proposed device can be used to evaluate the efficiency of sliding on snow at a given temperature, snow structure, humidity, and the roughness of the ski surface sliding on snow

This paper presents an analysis of the effectiveness of using one-dimensional network models for virtual assessment of hemodynamic indices whose values are widely used in clinical practice to choose a treatment strategy for coronary heart disease with stenotic lesions of the coronary arteries. It is shown that existing approaches make it is possible to assess hemodynamic indices based on clinical data collected without intervention in the body with an accuracy comparable to the accuracy of the input data and direct measurements. It is also important to take into account the state of the myocardium microvasculature and its influence on the interpretation of modeling results and direct measurements in the clinic

An approach is proposed for quantitative assessment of the shagginess of the lumen of a pathologically altered aorta, taking into account the three-dimensional morphology of its internal surface. An algorithm for assessing local shagginess has been developed and implemented, and an integral criterion for shaggyness in the anatomical region has been proposed. The algorithm was tested on data from two patients with a shaggy and a smooth lumen. The results obtained are in good agreement with the results of visual assessment by expert surgeons and are confirmed by clinical outcomes during surgery

Salmonella typhimurium and Listeria monocytogenes bacteria, which are two important bacteria used for bacterial therapy purposes in order to limit tumor growth, are studied. Mechanical specifications of the bacteria obtained applying nanoindentation with the use of atomic force microscopy (AFM) are reported. The results show that Salmonella typhimurium bacteria have a greater elastic modulus, but smaller adhesion than Listeria monocytogenes bacteria. The elastic modulus of the AFM extension stroke is larger than that of the retraction stroke. The resonant frequencies and amplitudes of the frequency response function of the AFM beam's vertical movements with two bacteria as samples are investigated using the finite element method. The results show that an increase in the elastic modulus of the sample raises the resonant frequency; therefore, the resonant frequency of Salmonella typhimurium bacteria is greater than that of Listeria monocytogenes bacteria. The results obtained by the finite element method and experimental techniques are found to be in good agreement.

The anthecology of the perennial herbaceous long-rhizome polycarpic plant, Galium odoratum (L.) Scop., in the Moscow region was studied. The observations were carried out in 2021-2023 according to generally accepted methods. At low illumination (less than 15 % of total sunlight) only perfect flowers are formed. With increasing illumination (to up to 60 % of full sunlight in clear weather), both perfect and staminate flowers are formed on individuals. The perfect flowers of G. odoratum are strictly protandrous. The life span of perfect flowers was 12-14 days, that of staminate flowers up to 2 days. The opening of flowers in synflorescence and in its structural units (dichasia) occurs in a clear sequence following to the order of branching of the shoot on which the flowers are formed. According to the ratio of the number of pollen grains and ovules in perfect flowers (from 1358 to 3010), G. odoratum represents a facultatively xenogamous plant. In habitats with a high degree of illumination, the perfect and staminate flowers of G. odoratum are characterized by a morning opening rhythm with a maximum at 8 a.m. In low illumination, the flowers open a few hours later.

The success of plant introduction (transfer to new environmental conditions) is largely determined by their various biological features. This article analyzes the results of the introduction of several hundred species of herbaceous plants into the southern taiga of the Middle Urals (Ekaterinburg) and Western Siberia (Tomsk), as well as into some other introduction points of the taiga zone. The influence of the specificity of geographical distribution of species (chorological and zonal groups), their life forms, the pattern of seasonal development and phenorhythmotypes on the success of introduction was studied. General biological features of the species have been identified that contribute to their successful introduction into the southern taiga subzone, which suggests the stability and reliability of the established patterns. It has been shown that species distributed throughout Europe (except Southern Europe) and in Northern Asia are promising for introduction into these conditions. The introduction of forest (boreal and nemoral) species is proceeding successfully. The result of the analysis of the life forms of introduced species showed that hemicryptophytes are the most promising (according to the classification of K. Raunkier), herbaceous long-rhizome and creeping plants (according to the classification of I.G. Serebryakov) characterized by a high intensity of vegetative propagation. Species that regrowth early and begin flowering early during the growing season are also promising. The least successful introduction into the southern taiga is typical for Mediterranean and South-West Asian species, as well as for those distributed in the subtropical zone. Species with the life form of chamephytes (according to the classification of K. Raunkier) and subshrubs (according to the classification of I.G. Serebryakov) are of little prospectivity, as well as species characterized by late times of spring regrowth and the beginning of flowering.

Comparative data of phytochemical evaluation of the content of biologically active substances, antiradical activity and antiviral properties in plant raw materials of Astragalus glycyphyllos L. from wild populations of the forest-steppe zone of Western Siberia are presented. During the vegetation period the dynamics of the content and the peculiarities of accumulation of the total content of phenolic compounds, flavonoids, tannins, phenolic acids, saponins, carotenoids, chlorophylls a and b, pectins and protopectins were investigated, changes in antiradical activity and antiviral action against human influenza virus - A/Aichi/2/68 (H3N2) and bird - A/chicken/Kurgan/05/2005 (H5N1) in extracts obtained from plant raw materials of above-ground and underground parts of A. glycyphyllos. It was found that the aboveground part of A. glycyphyllos is richer in BAS content than its underground part. In the aboveground part of A. glycyphyllos maximum amounts of most biologically active substances of the studied groups are accumulated in different phases of development, but mainly in the phase of fruiting termination. In the underground part, only protopectins were found in maximum amounts in the phases of the beginning of vegetation and fruiting. The antiradical activity of extracts from above-ground and underground parts of A. glycyphyllos was manifested during the whole vegetation period, but samples from raw materials of above-ground and underground parts at the end of vegetation were more effective. The study of toxicity and antiviral effect of extracts obtained from raw materials of both parts of Astragalus glycyphyllos in maximum tolerated concentrations showed that the IN of the extracts was within the range from 0 to 1.5 lg, depending on the subtype of influenza A virus, the growing season of A. glycyphyllos, its part in the study and the type of extract. Compared to the control, there was a significant decrease in the infectivity of human influenza virus and avian influenza virus under the influence of A. glycyphyllos extracts.

Data on four species of the genus Pleurotaenium Nägeli found by us in water bodies of the southern part of the Russian Far East have been published. Rare taxa P. subcoronulatum var. detum and P. caldense var. cristatum were recently discovered by us in the Bastak Nature Reserve (Jewish Autonomous Region). P. cylindricum var. stuhlmannii and P. verrucosum are recorded for the Russian Federation for the first time. The diagnoses of species based on our material, information about the location of species and their distribution are given. According to the available literature data, the species and varieties of the genus Pleurotaenium that we found are most often occur in South America (in particular, Brazil) and East Asian countries. Apparently, the presence of the species of the genus that we discovered indicates the proximity of the flora of desmid algae in the southern regions of the Russian Far East to the East Asian region. The data obtained make it possible to supplement and expand information on the distribution of desmids and representatives of the genus Pleurotaenium in Asia.

Five species new to the adventive flora of the Republic of Altai are reported: Colchicum speciosum Steven, Cuscuta campestris Yunck., Lamium maculatum (L.) L., Phalaroides japonica Steud., Prunus cerasus L. New locations of 11 species were discovered: Amaranthus blitum L., Astragalus falcatus Lam., Callistephus chinensis (L.) Nees, Carduus acanthoides L., Euphorbia marginata Pursh, Ipomoea purpurea (L.) Roth., Picris hieracioides L., Reynoutria japonica Houtt., R. sachalinensis (F. Schmidt) Nakai, Rudbeckia hirta L. and Stachys annua (L.) L., rare in the region. For 10 alien species, penetration into new areas was noted, among them Arctium minus (Hill) Bernh, Galinsoga parviflora Cav. and Lepidium ruderale L., which are invasive species in the Republic of Altai. Features of the settlement in the republic of Amaranthus blitum L., Carduus acanthoides L., Portulaca oleracea L., Parthenocissus quinquefolia (L.) Planch., Reynoutria japonica Houtt., Rudbeckia laciniata L., Rumex obtusifolius L., Thladiantha dubia Bunge allow them to be classified as potentially invasive species in the region. Most of the species discussed are xenophytes, accidentally introduced species.

As a result of the studies conducted in 2020-2022, seven species and subspecies of alien vascular plants were identified on the territory of Omsk Region. Four of them have not been previously recorded for this territory (Inula helenium L., Prunus pumila L. var. pumila и Prunus pumila var. besseyi (L.H. Bailey) Waugh., Rosa spinosissima L.). For three species (Astragalus cicer L., Aquilegia vulgaris L. and Centaurea jacea L.) new localities were found. For each species (subspecies) a list of locations is provided with an indication of the geographical coordinates of the collection or observation sites. The detected findings of alien species are mainly confined mainly to settlements and areas under intensive economic turnover. The path of introduction and the degree of naturalization of alien species were assessed. By mode of introduction Centaurea jacea and Inula helenium are xenoergasiophygophytes, while Astragalus cicer, Aquilegia vulgaris, Prunus pumila var. besseyi, P. pumila var. pumila and Rosa spinosissima are ergasiophygophytes. The appearance of Prunus pumila var. pumila in the region is probably connected with creation of forest windbreaks in steppe areas of the region in 1970-1990s, appearance of other species is connected with their cultivation in homestead plots. Centaurea jacea is an autochthonous species in the southern subtaiga of Omsk Region, while in the forest-steppe zone it is an alien species. According to the degree of naturalisation, most of the detected plants are colonophytes, while Centaurea jacea is an epecophyte in the forest-steppe and Aquilegia vulgaris is an ephemerophyte. Findings were confirmed by herbarium specimens or geo-referenced photographic observations.