Home – Home – Jornals – Avtometriya 2015 number 5

This work is devoted to a possible way to construct time-optimal closed systems for incompletely determined linear models of distributed-parameter control plants of parabolic type, which provides real-time identification of their parametric characteristics according to the results of monitoring the state of the plants. The structural-parametric synthesis of the proposed controllers is based on the alternance method of designing optimal software controls. The paper gives an example (of independent interest) of constructing a time-optimal system for the control of the process of induction heating under typical conditions of interval uncertainty of the initial temperature and heat losses.

This work is devoted to the technique of solving the problem of structural-parametric synthesis of typical controllers in a multiloop cascade automatic control system, which is developed on the basis of the alternance method of parametric optimization that provides the maximum degree of invariance of local control loops relative to external perturbations with given limitations on the peak of amplitude-frequency characteristics of closed loops of the synthesized automatic control system. The task of optimizing the subsystem for controlling the fuel oil temperature in a multiloop control system of primary oil refining on an atmospheric and vacuum crude distillation unit is considered as an example, which is of independent interest.

It is shown that the problem of estimating unmeasurable external perturbations from a mathematical point of view is equivalent to estimating some of the state variables of an extended plant. An algorithm for estimating unmeasurable external perturbations using a functional observer is proposed, and conditions for the solvability of the synthesis problem are formulated. The resulting solution is obtained using the method of matrix canonization.

The problem of control of the aircraft attitude in a three-dimensional space is considered. The attitude is described by the Euler angles between the axes of the body-fixed coordinate system and the Earth frame. A method of calculating the torque driving the aircraft to a prescribed attitude is proposed. A controller implementing this method is presented. Results of simulations are reported.

A method of synthesis of a self-adjusting multichannel system with a reference model for centralized control of autonomous underwater vehicle motion is developed. Conditions of selfadjustment process stability with allowance for dynamic reciprocal effects and kinematic relations between all control channels in the presence of parametric nonstationarity of the complete nonlinear mathematical model of the vehicle are obtained. The amplitude of the self-adjustment signal is formed as a function of coordinates and reference-input signals in order to reduce the control signal magnitude. The developed system ensures a high quality of control of an underwater vehicle with significant variations of its parameters.

A possible approach to the calculation of standard controller parameters based on the localization method is considered. It is shown that the controllers designed in this way completely solve the problem of stabilization of first- and second-order nonlinear nonstationary plants. Variants of implementation of standard controllers and recommendations for calculating their parameters are presented and the properties of the obtained automatic systems are investigated. It is noted that a general characteristic feature of systems with the proposed PID controller is the occurrence of fast motion components against the background of slow work processes. Results of numerical modeling illustrate the main properties of the systems considered.

An algorithm of the simplex method not requiring an explicit updating of the LU decomposition in iterations is considered. Solutions obtained with fixed LU factors are corrected using small auxiliary matrices. The results of numerical experiments are presented.

The model of several interacting Cournot markets is considered. The markets are named interacting because the same number of producers act on each of them. Every producer chooses his own supply volumes on every market using the price situations, his own costs and production and delivery limitations. It is proved that in the case of the linear demand functions the problem of finding the Nash equilibria in the interacting Cournot markets model represents a potential game, i. e. it is equivalent to a mathematical programming problem. Nonlinear demand functions linearization procedures and preferences of initial problem reduction to the potential game are discussed.

Normality conditions are found for the operators associated with the semilinear analogs of the Stein matrix equation, namely, with the equations X A X B = C and X − AX*B = C.

In this paper, the kinematics of the tsunami wave ray and wave front above an uneven bottom is studied. The formula to determine the wave height along a ray tube is obtained. The exact analytical solution for the wave-ray trajectory above the bottom slope is derived. This solution gives the possibility to determine within the wave-ray approach the tsunami wave heights in an area with a sloping bottom relief. The distribution of the wave-height maxima in the area with the sloping bottom is compared to the one obtained by the numerical computation with a shallow-water model.

In this article, we discuss a new single sweep compact alternating group explicit method for the solution of time dependent viscous Burgers' equation both in Cartesian and polar coordinates. An error analysis for the new iterative method is discussed in detail. We have compared the results of the proposed iterative method with the results of a corresponding double sweep alternating group explicit (AGE) iterative method to demonstrate computationally the efficiency of the proposed method.

An economic damage optimization problem from local sources in a region has been formulated. An algorithm for solving the problem is proposed. Numerical experiments illustrating theoretical statements of the formulated problem and effectiveness of the algorithm proposed were carried out.

This paper presents a criterium, called the coefficients stability for inaccuracy in determining the coefficients of nonlinear regression models describing inexact data. A method for the coefficients stability estimation is also described. The proposed criterium is illustrated by a computational experiment with the data obtained by measurements of a refractive index dependence on the wavelength in 400−1000 nm band for a transparent polymer. The convergence of the proposed criterium to the known analytical solution for the case of linear regression is also studied.

In this paper, based on mathematical modeling, the convective heat transfer of an electroconductive liquid with regard to the internal sources of heat and the Joule dissipation in a spherical layer with heat from below is investigated. The structure of a flow, temperature field, magnetic field distribution and the Nusselt numbers are investigated.

In this paper, an implicit method of decomposition of 7-th degree Hermite splines to a series of «lazy» wavelets with displaced supports is investigated. A splitting algorithm for wavelet transforms of solving four five-diagonal s stems of linear equations with a strict diagonal dominance in parallel is justified. Results of numerical experiments on exactness for polynomials and on compression of spline-wavelet decomposition are presented.

The elemental composition of humic acids (HA) of sapropel from the lakes of the Middle Ob Region and the south of the Ob-Irtysh basin, formed under various hydrothermal and ecological conditions, was studied for the first time. Specific features of the elemental composition (element content, atomic ratios, oxidation degree) were revealed, pointing to the relations between aromatic and aliphatic parts and to the conditions under which humification proceeds. Nitrogen content of HA in sapropel from the Novosibirsk Region is almost twice higher than that in HA in sapropel from Khanty-Mansiysk AD. It was established that the H/C ratio varies within the range 0.83-1.19 for HA of sapropel from the sothern part of West Siberia, while for HA of the Middle Ob territory this ratio varies from 0.87 to 1.24. This is an evidence of lower benzenoid degree  and “maturity” of macromolecules in the taiga region. With respect to oxidation degree , HA of sapropel have reduced form and the negative  value, except for HA of sapropel from some lakes in the Middle Ob Region, for which oxidized forms and positive  values were established. The results of the work may be used for large-scale evaluation of sapropel deposits; they may also serve as information source for making humic preparations. The studies are necessary for the development of technologies for the production of new kinds of products for agriculture, medicine and engineering.

A procedure based on thin layer chromatography (TLC) was proposed for the determination of the components of essential oil of Pelargonium graveolens L’Her manufactured in Tadzhikistan. Citronellol, geraniol, linalool, phenyl ethyl alcohol were chosen as the standard samples of witness substances (SSWS). As a result of the work, the following chromatography conditions were determined: eluting system - benzene/chloroform (1 : 1), detecting reagent - 5 % ethanolic solution of phosphomolybdic acid, volume of sample applied - 5 mL, concentration 0.005 g/ml. It was established that the polarioty of eluent affects the separation of the components of essential oil from Pelargonium graveolens L’Her. The optimal value of system polarity is 3.19. Seven spots are observed in the chromatograms of pelargonium essential oil manufactured in Tadzhikistan; four of these spots were identified on the basis of R f value and the positions of SSWS spots. The results showed that the chromatographic profile of essential oil from the plant species under under study differs from the essential oil of another manufacturer, essential oil with similar composition (citronellla oil and lemongrass oil) and widespread readily available oil (lavender and sage). Chromatographic profiles differ by the presence of additional spots with different number, size and position. The data obtained provide evidence of the possibility to use TLC as a rapid method to identify essential oil of pelargonium manufactured in Tadzhikistan.

It was demonstrated that preliminary surface modification of basalt fibres through the deposition of oxide coatings enhances the stability of fibres in the alkaline medium opf concrete matrix. It was established that unprotected fibres exhibits the highest corrosion degree in the concrete matrix in comparison with the fibres coated with titanium dioxide or zirconium dioxide. A positive effect of increased stability of fibres to alkalis as a result of deposition of protective coatings ios accompanied by insignificant decrease in compression strength of fibroconcrete; the compression strength decreases in the sequence: uncoated fibres - fibres coated with titanium dioxide - fibres coated with zirconium dioxide. Varying the chemical nature of protective coatings, one may affect the degree of adhesion between fibres and the concrete matrmix and, as a consequence, the mechanical properties of fibroconcrete.

The concept of acceplable risk of the violation of statistical interval boundaries is proposed instead of the existing approach to the evaluation of composition and properties of substances and materials on the basis of the concept of absolute confidence to measurement results. For water quality control as example, it is demonstrated that though the novel approach, similarly to the existing one, does not provide complete faultlessness of conclusions concerning controllable parameters on the basis of the results of sampling tests, it ensures the target level of reliability (risk) of estimations, necessary for making correct scientific and managemend decisions. It is also demonstrated that decreased risk of erroneous acceptance of the correspondence of controllable parameters to established requirements in the case of actual discrepancy may be provided by the substitution of nonrigorous method of restriction by the rigorous one.

From 29 June to 5 July 2015, the Republic of Buryatia (Ulan-Ude - the lake. Lake Baikal, p. Gremyachinsk with. Goryachinsk) held a regular All-Russian scientific conference with international participation "II MATERIAL Baikal forum". The forum featured presentations, an exhibition of documents and photographs, as well as showing films dedicated to the memory of large domestic materials scientists, Corresponding Member. USSR MV Mohosoeva (1932-1990 gg.) And Academician FA Kuznetsov (1932-2014 gg.).

In recent decades, the Russian Federation has developed a stable situation in which sales of imported biological products for medical, veterinary and agriculture account for 70-80% in terms of money and domestic - 60-70% in physical terms.

The use of natural oligosaccharides and polysaccharides as complexing agents for the delivery of pharmaceutical substances causes a substantial increase in their therapeutic activity and storage stability, and reduces side effects. The use of modern physical methods to study molecular processes allows obtaining unique information on the structure, dynamics and physicochemical properties of supramolecular inclusion complexes of pharmaceutical compounds. The review illustrates the possibilities of physical methods in studying the means of drug delivery in the solid state and in solutions, and in establishing the mechanisms of increasing bioavailability of pharmaceutical compounds within inclusion complexes.

Modified technology of obtaining arabinogalactan from wood of Larix sibirica and Larix gmelinii on the basis of aqueous extraction of arabinogalactan in the ultrasonic set-up, filtration of the extract, its separation into fractions by means of ultrasonic spraying and concentrating in a rotary vacuum evaporator is considered. The concentrate is precipitated in the organic solvent, washed, dried and ground. It is notable that arabinogalactan extraction is carried out without preliminary extraction of dihydroquercetin.

Intermolecular complexes of the guest-host type possessing increased water solubility were obtained by means of solid-phase mechanochemical treatment of a number of benzimidazole antihelminthic pharmaceutical substances with water-soluble polymers - polyvinylpyrrolidone, hydroxyethyl starch, arabinogalactan polysaccharide (from wood of Larix sibirica and Larix gmelinii ). Physicochemical studies of the complexes were carried out. An increase in antihelminthic activity of the preparations with respect to different laboratory models of helminthes was discovered and confirmed in experiments with sheep spontaneously infested by nematodes of gastrointestinal tract, with a decrease in substance dosage by a factor of 9-10.

Opisthorchosis is a widespread helminthiasis at the territory of Europe and Asia, accompanied by such complications as gallbladder dysfunction, cholecystitis, cholangitis, hepatic abscess, and cholelithiasis. Prasiquantel, a preparation used at present to treat opisthorchosis, is insufficiently effective. Mechanochemical preparation of the intermolecular complexes of antihelminthic agent albendazol with polysaccharide arabinogalactan is described. The activity of these complexes against opisthorchosis was studied in vivo in laboratory animals. The possibility of the development of new medical products based on albendazol exceeding prasiquantel is demonstrated.

Phytocompositions based on Gynostemma pentaphyllum (GP) and arabinogalactan (AG) were obtained by means of mechanochemical activation. The addition of AG into the mixture under treatment promotes the formation of water-soluble intermolecular complexes with increased biological assimilability of biologically active substances, and increases the solubility of the phytocomposition in water. In all activated samples, the extractability of saponins from GP increases by a factor of 3.4-4.7. The hypolipidemic action of GP-based samples was demonstrated for the hyperlipidemia model in mice after single intra-abdominal introduction of poloxamer-407. The introduction of GP/AG composition at a ratio of 1 : 2 (by mass) caused a decrease in the level of cholesterol and triglycerides by 56 and 63 %, respectively. For the model of high-lipid diet for rats, the hypolipidemic action of the phytocomposition under investigation was confirmed: the level of triglycerides and cholesterol decreased by 46 and 29 %, respectively, in comparison with reference animals kept to a fatty diet.

Promising multicomponent compositions of preparations for integrated protection of plants were obtained using the methods of mechanochemistry. Due to the use of polysaccharides, in particular arabinogalactan (from wood of Larix sibirica and Larix gmelinii), the obtained seed disinfectants based on tebuconazol are characterized by improved physicochemical, technological and biological parameters. Tests of the preparations under laboratory conditions provide evidence of the synergism of biological properties, which is exhibited as acceleration of the growth of crop plants, stability of the root system to diseases, and an increase in the crop capacity of spring wheat with a decrease in the consumption of the active substances in the preparations. It is shown that intermolecular complexes of tebuconazol based on arabinogalactan possess high biological activity with decreased consumption of the preparation.

Complexation of the derivative of 1,2,4-thiadiazole, exhibiting biological activity in therapy of Alzheimer's disease, with β-and hydroxypropyl-β-cyclodextrin was studied using the methods of isothermal saturation and UV spectroscopy in phosphate buffer solution (рН 7.4). It was shown that the formation of the complexes with stoichiometric composition 1 : 1 involves the inclusion of the benzene ring of guest molecule, which is held in the macrocyclic cavity of the host mainly by hydrophobic interactions. Hydroxypropyl-β-cyclodextrin exhibits higher complex-forming and solubilizing capacity in comparison with β-cyclodextrin with respect to the biologically active compound.

Composite materials based on chitosan with molecular mass 190 000 a.m.u. and hydroxyapatite with acerage particle size 20-30 nm with different filling degree were obtained. The optimal amount of hydroxyapatite (0.03 and 1 mass %) for modification providing an increase in film strength by 20 % was determined. Periodic change of the size of polymer grains during modification was revealed. The effect of such parameters as components ratio, compacting pressure and mold humidity on highly filled composite materials obtained by pressing was studied. The density, rupture and tensile strength, compression strength and apparent density of the obtained samples were determined.

Expediency of the application of results achieved in medicine, in the development of nanopharmaceutical materials with sharply increased antimicrobial activity, for plant cultivation was observed. It was established that these preparations provide plant protection against pathogens and unfavourable effects of abiotic nature. The stimulating action of bismuth and silver nanopreparations on the length of germs and roots of spring wheat exceeds the reference level by a factor of 1.2-1.3. The fungicide action of nanopreparations decreasing the development of the disease (root rot) by a factor of 2-4 was discovered. Optimal concentrations and standards of bismuth nanopreparation concumption for industrial tests in cereal production were proposed. Biologically active nanopreparation exceeds important seed disinfectants in efficiency, which opens the outlooks for import substitution in this area.

Forest pyrology was used as a part of the forestry in the end of the nineteenth century. The founder of the forest pyrology in Russia was academician Ivan S. Melekhov. He defined it as a science of nature of forest fires, their effects, fire fighting methods, and positive function of fires in the forest. Formed as a branch of the forestry, forest pyrology became an independent science that developed as a theory and practice of forest protection. Separation of forest pyrology to an independent branch of the science was caused by the results of the much research that revealed great importance of the forest fires as a factor of the forest formation and as an ecological and evolutional factor that is of global importance. Fires greatly influence forest formation, their distribution, state, and productivity. In the paper, the short historical review of the main periods of Russian forest pyrology is given. Five periods were determined from the beginning of its origin to the further development. The total state of the science of forest fires in Russia is provided. It is noted that the organization of the laboratory of forest fires in 1959 in the V. N. Sukachev Institute of forest and wood SB AS USSR resulted in the academic recognition of the forest fires science; thus fire investigations in Siberia became systematic. The large contribution of the Russian scientists to the investigations of forest fires is emphasized. Many achievements of Russian forest fire scientists became world-famous.

This paper reflects the planetary role of Russian forests in formation of vegetation biodiversity, providing resource and ecosystem services as well as maintaining human-friendly environment. It depicts the history and framework of biodiversity monitoring of Russian boreal forests on the basis of remote sensing and ground-based data. The framework is based on a conceptual approach of biodiversity investigation taking into account the spatial-temporal dynamic and current forest state. The emphasis is put on the originality of the modern stage of forest cover assessment using remote sensing data - the most important component of information management of regional natural and anthropogenic forest dynamics. The application of advanced quantitative methods of GIS-technologies through analysis of satellite data and digital elevation model (DEM) in order to determine the genetic, spatial and temporal relationships between typological diversity and environmental factors enables to develop a new approach for the study of multidimensional spatial differentiation of forest cover. Local data interpolation during the ground research at upper scale levels using spectral satellite imagery processing and quantitative methods makes it possible to save important information on the structure and vegetation properties. Several examples of forest typological inventory at the federal, regional and local levels are provided. The system of indicators aimed at practical application of forestry and environmental management at the regional level, developed in this paper, helps identify qualitative changes in forest cover under the influence of climatic and anthropogenic factors and develop appropriate measures to maintain the necessary level of forest biodiversity of the territory.

According to the data borrowed from the Biodat base on areas of 536 species of wood plants by means of one of methods of the cluster analysis floristic classification is made and division into districts of Northern Eurasia is executed. Three regions that, in turn, are divided into provinces and districts, are as a result allocated. The border between Southwest and Northeast regions passes diagonally from the northwest on the southeast from the Gulf of Finland of the Baltic Sea to Altai. Such arrangement of border is caused by incomplete postglacial restoration of areas of broad-leaved tree species and modern distinctions in the hydrothermal mode. Considerable similarity of this border with carried out earlier as a result of the similar analysis of fauna of vertebrate animals though on land vertebrata it runs North - from the Kola Peninsula to Baikal is shown. Estimates of communication of variability of communities with various factors of the environment are similar, but usually on land vertebrata they are slightly higher, except for provinciality (35 and 19 % of dispersion). It testifies to more accurate reaction of animals to distinctions in the environment. The exception on provinciality is connected with more coincidence to its accepted gradation on plants (The European, West and East Siberian provinces). It is confirmed by estimates of communication with regionality - division into groups of provinces (regions) that differ on fauna and flora (29 and 38 %) less. The regime explanation of heterogeneity of flora, on the contrary, is slightly fuller, than on fauna (73 and 64 %) though the total assessment on general concepts is approximately identical (80 and 81 % of dispersion).

The effect of drought on the 8-9-year-old seedlings of Scots pine ( Pinus sylvestris L.) was simulated in the field by isolating trees from precipitation. The biochemical changes typical of water stress wеre compared with the structural changes of the annual rings of wood. The samples of the current and last year needles, cambium and adjoining layers of xylem and phloem of stems and roots were analyzed. In the needles, the content of chlorophyll a and b and carotenoids were determined. The contents of hydrogen peroxide and malondialdehyde (MDA), the activity of enzymes, realizing antioxidant protection: superoxide dismutase (SOD), peroxidase, glutathione reductase and content of sugars and starch were determined in tissues of xylem, phloem and cambium. It was shown that drought reduces the weight of the needles, the chlorophyll content and the width of the annual wood rings. In moderate drought in the cambial zone oxidative stress was developed and also protection system against free radicals was activated, which resulted in a high SOD activity and the accumulation of hydrogen peroxide due to the activity of peroxidase reduction. As a result, the division processes in cambial zone and cells extension growth were inhibited and the width of annual wood rings decreased due to reduction in the number and size of tracheids. It was found that decrease in growth was not due to deficit of carbohydrates for the process xylogenesis. Water deficit increases the concentration of low molecular weight carbohydrates in the tissues, which, due to the inhibition of division and extension cambial derivatives are only partially used for thickening tracheid cell walls. As a result, abnormal tracheides with reduced size of cells and lumens and thickened cell walls were formed. Abundance of soluble carbohydrates was deposited as a reserve pool in the root phloem in the form of starch. The stock function of root phloem was increased under water deficit conditions.

Soil cover transformation and changes of morphological and chemical properties of Albeluvisols in clear-cuttings of middle taiga spruce forests were studied. The observed changes in structure and properties of podzolic texturally-differentiated soils at cuttings of spruce forests in the middle taiga subzone do not cause their transition to any other soil type. Soil cover of secondary deciduous-coniferous forests which replace cut forests are characterized with a varied soil contour and a combination of the main type of podzolic soils under undisturbed spruce forests. The increased surface hydromorphism in cut areas causes formation of complicated sub-types of podzolic texturally differentiated soils (podzolic surface-gley soils with microprofile of podzol) and enlarges their ratio (up to 35-38 %) in soil cover structure. Temporary soil over-wetting at the initial (5-10 years) stage of after-cutting self-restoring vegetation succession provides for soil gleyzation, improves yield and segregation of iron compounds, increases the migratory activity of humic substances. Low content and resources of total nitrogen in forest litters mark anthropogenic transformation processes of podzolic soils at this stage. Later (in 30-40 years after logging), soils in cut areas still retain signs of hydromorphism. Forest litters are denser, less acidic and thick with a low weight ratio of organic carbon as compared with Albeluvisols of undisturbed spruce forest. The upper mineral soil horizons under secondary deciduous-coniferous forests contain larger amounts of total iron, its mobile (oxalate-dissolvable) components, and Fe-Mn-concretions.

Comparative investigations of chromosome numbers and chromosome rearrangements in populations of Norway spruce ( Picea abies (L.) H. Karst.) growing in the territory of State Forest Service «Garmen», «Eleshnitsa», «Yakoruda», «Dobrinishte» in Rila-Rhodope mountain region (Bulgaria). Populations are located at the southern border of species range, and protected according to Bern Convention and EC Habitat Directive 92/43. It was found that diploid set of seed progeny of P. abies from the 4 populations studied includes 24 chromosomes (2 n = 2 x = 24). Mixoploidy (2 n = 24, 36; 2 n = 24, 48; 2 n = 24, 36, 48) was detected in some germinating seeds of all studied populations of P. abies. Metaphase cells of germinating seeds of P. abies from State Forest Service «Garmen» and «Eleshnitsa» contain supernumerary, or B-chromosomes, while the variability of their number and occurrence was observed. In cells of germinating seeds of P. abies from State Forest Service «Yakoruda», «Dobrinishte», B-chromosomes are not revealed. Some chromosome rearrangements such as fragments and ring chromosomes were revealed in metaphase cells of P. abies from populations of «Garmen», «Eleshnitsa» and «Dobrinishte». Probably occurrence of mixoploids, B chromosomes and chromosome rearrangements in P. abies populations growing in Rila-Rhodope mountain region is connected with adaptation of trees to the extreme environmental conditions and such a serious factor that presently forests in the studied region located in the zone of natural radioactivity and in the past, the region of study was subjected to substantial anthropogenic pressure due to uranium extraction industry.

The article presents the data on the forest litter of the Korean pine-broad-leaved forests of the South of Primorsky krai. The focus of the research is plantations dominated by Korean pine; areas of the main tree species with ages of 50, 80, 130 and 200 years were selected. The dynamics of the forest litter stock in the pine and broadleaved forests of different ages according to the measurement results for the season in 2014 is stated. In the studied plantation, the forest litter stock varies between 9.7-20.3 t ha ^-1. The greatest value of the forest litter stock is recorded in old-growth cedar forest (200 years). Relatively high power and the stock of litter are typical for young Korean pine forest that can explain the lower speed of the litter properties change against the dynamics of taxation indicators of the forest stand. The difference between the amount of the litter in the 200-year-old and remaining pine trees are statistically significant at p = 0.05. The dependence of the litter power on the age is not revealed. The coefficient of the forest litter decomposition ranges from 2.55-10.60 that characterizes the high speed of its rotting. The highest coefficient of the litter decomposition has an old-growing pine forest. The schedule of seasonal humidity fluctuations of the forest litter on the chosen plot is made; with increasing cedar forest age, the volumetric moisture content of the forest litter increases; volumetric moisture content on the plots remain relatively unchanged during the season. The area of the Korean pine forests of Primorsky State Academy of Agriculture is 6835 ha. The amount of carbon stock in the forest litter is 38.7 thousand tons C. in this area, while the system of regional assessment of the forest carbon balance estimates this index as 24.3 tons С. The data obtained can be used to adjust the coefficients of regional assessment of the forest carbon balance for cedar forests of Primorsky krai.

In order to solve various research tasks, actual morphometric parameters of trees and forest phytomass assessment data are of great scientific interest and intended for multipurpose applications. However, often this important original information is stored in the archives of the researchers or institutions, will not be published and is not available for detailed analysis and reliable comparisons. The records of morphometric parameters and above-ground phytomass of the Siberian larch ( Larix sibirica Ledeb.) trees, measured on coordinate sample plots established in Eastern Khentey, northern Mongolia are presented in the paper. The morphometric parameters and phytomass of the trees are considered as the main characteristics, that determines course of the processes in forest ecosystems, and might be used for environmental monitoring, sustainable forestry, forest productivity modeling, taking into account global changes, studying the structure and biodiversity of forest cover and assessment of forest carbon sequestration. The study of morphological structure and phytomass of trees seems necessary because the various structural parameters and fractions have different content of nutrient elements and different contribution to annual production of forest stands. On the basis of biometric statistics, allometric equations relating morphometric and production parameters of the larch trees have been calculated, which can be used in ecological modeling, forest inventory and thematic forest interpretation of aerial- and satellite scenes in northern Mongolia.