Lesnoy Zhurnal-Forestry Journal最新文献

{"title":"Solving the Lamé problem in the quasi-brittle setting to substantiate the solution scheme for rock breaking by the blast-hole method","authors":"G. Pershin, Elena Pshenichnaia","doi":"10.21440/0536-1028-2023-3-43-54","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-3-43-54","url":null,"abstract":"Introduction. The blast-hole method of mining and preparing rocks for excavation has been used by mankind since ancient times. However, there are no generally accepted and generally recognized design and calculation methods for this process, which was established in the review part of this work. Research objective is to develop a basic analytical model for hard rock quasi-brittle materials breaking by a blast-hole method using static thrusts. Methods of research. A detailed analysis of the breaking mechanism through the transition state from the rock material continuity to its separation is the methodological basis of the developed quasi-static model for calculating the energy-power indicators of the process of separating volumes (pieces) of rock into separate parts. It makes it possible to justify and determine: the irreversible energy of rupture through the energy constant rock material in relation to the process energy efficiency, critical load resulting in local breaking, the size and number of the primordial tension cracks, as well as the number of through cracks. Result. The obtained indicators and parameters formed the body of the energy balance equation of the irreversible energy of rupture of rock pieces. The developed methodology for setting and solving the problem of the limiting state of quasi-brittle materials rupture in the form of a thickwalled cylinder (the Lamé problem) that simulates a certain solid volume deformed by a uniformly distributed blast-hole pressure of thrusts, is universal and can serve as a base for assessing a set of issues related to mining. The resulting interrelation of indicators made it possible to derive an equation for the energy balance of the rock volumes rupture. Due to the solution for this equation, the critical value of the blast-hole pressure that results in local breaking, the size of primordial cracks, and the corresponding limiting burst pressure were obtained for the first time. Theoretical novelty. Within the framework of the general approach of the quasi-brittle materials breaking linear theory, based on the developed methodology, the problem of the limiting state of the rock in the form of natural joint loaded with a static thrust through a single blast-hole, was correctly stated and solved by the energy method for the first time. As a result of the research, an analytical dependence of the rock static breaking energy intensity was obtained, which includes both the volumetric specific energy of potential deformation and the specific surface energy","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"78 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73278087","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}

{"title":"Results of the 9th Research and Practice Conference of the Ural Shotfirers","authors":"","doi":"10.21440/0536-1028-2023-3-127-133","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-3-127-133","url":null,"abstract":"The article presents the results of the research and practice conference on mining and blasting in the Urals which was organized by the Institute of Mining and the Ural Association of Shotfirers (Vzryvniki Urala) within the framework of the 10th Ural Mining Forum at the IEC EkaterinburgEXPO with a field meeting at NAO NIPIGORMASH and tours to the OOO Protol production site, Nevyansky Tsementnik JSC, OOO Nevyanskoe karieroupravlenie, Demidov Museum, and the Leaning Tower of Nevyansk. Scientific reports and presentation on safe subsoil use and blasting were heard at the conference; special blasting work of explosion welding and building collapse in construction were addressed; the latest developments of domestically produced charging and drilling equipment and emulsion explosives were presented; reports were given on the studies of seismic safety of open pit secure facilities and benches in the course of open-pit mining","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"46 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79390587","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}

{"title":"Developing a unit testing framework for control system software implementation of a degassing vacuum pumping station","authors":"Marat I. Abdrakhmanov","doi":"10.21440/0536-1028-2023-3-113-126","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-3-113-126","url":null,"abstract":"Research objective is to develop a test automation system for the process algorithm software implementation of the degassing vacuum pumping station control system operation at a coal mine. Relevance. The vacuum pumping station is an essential component of a mine degassing system. Degassing system operation depends on its correct functioning. A programmable logic controller with appropriate software is a key component of the vacuum pumping station automation system. Correct software implementation of the system operation process algorithm is of primary importance. To verify the compliance of the implementation with the requirements, manual testing is commonly used according to a pre-compiled test-plan, which is formed based on the requirements imposed on the system. Manual testing has a number of disadvantages. It is a long process where human errors are likely to occur, and the use of a test bench and/or an assembled control system sample is inevitable. Requirements for the algorithm can be changed in the course of program development, debugging, and initiation, which greatly complicates the testing process. Results. To solve the problem of process algorithm software implementation testing automation, the process control algorithm should be isolated from the software components responsible for the hardware. Access to the process control algorithm should be provided through standard interfaces (for example, OPC UA). Additional process equipment (valves, etc.) used in the automation system should be implemented in the form of emulators with an opportunity to assign their modes of operation. By creating an additional software layer of interaction with a process algorithm and emulator in a programming language with advanced test tools (for example, Python), it is possible to implement test scenarios from a test plan in this language. It will allow testing in automatic mode rather than manually. Conclusions. The proposed approach to process algorithm software implementation testing automation will greatly simplify software development for this type of automation and control systems","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91278796","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}

{"title":"Increasing the operating time of electrical submersible pumps by using self-cleaning filters","authors":"Iurii Korotkov","doi":"10.21440/0536-1028-2023-3-9-16","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-3-9-16","url":null,"abstract":"Introduction. The article considers issues relating to electrical submersible pumps (ESP) work under complicated operating conditions caused by a high content of solids in the pumped borehole fluid. Factors that cause or exacerbate these complications are also studied. The article justifies the urgency of increasing the operating time of submersible equipment under complicated operating conditions. Methods of research includes analyzing engineering and process approaches to ESP protection from a detrimental effect of solid particles. Within these approaches, specific ways of protecting borehole equipment from hydroabrasive wear are considered. It is concluded that today, in terms of economic indicators and efficiency, borehole and intake filters, mainly slotted, are preferable for ESP protection. The main advantages and disadvantages of known mass-produced slotted filter designs are considered. Results. The process of production tubing deformation in the course of pumping with ESP is considered and mathematically described. An engineering solution is proposed for a selfcleaning borehole slotted filter which makes it possible to eliminate the main disadvantages of slotted filters, specifically low dirt capacity and the need for tripping operations aimed at restoring the filter’s permeability. The method is given for calculating the deformation of the filter element within the slotted filter as part of the ESP below ground. Conclusions. The use of the described self-cleaning filter will increase the ESP operating time in wells characterized by solids circulation. Reducing trippings, and therefore the downtime of wells, during the operation of ESP with slotted filters will significantly reduce the costs of oil producing enterprises and increase oil production profitability.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"32 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82651228","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}

{"title":"Searching for the relationship between the temperature and humidity of tailings material by processing digital photographs of laboratory experiments and color models","authors":"P. V. Amosov, A. Goriachev, Kirill A. Malodushev, Dmitrii Makarov, V. Masloboev","doi":"10.21440/0536-1028-2023-3-66-85","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-3-66-85","url":null,"abstract":"Relevance. Tailings beach surface dries and deflates, which intensifies the dusting process, results in ecosystems disruption on the adjacent territories, and adversely impacts health of population. The use of digital photographs, including those obtained with the help of unmanned aerial vehicles, seems to be promising in terms of reagents application simplification and dusting minimization. Research objective is to determine the quantitative relationship between the temperature and humidity of tailings materials by analyzing the digital photographs of laboratory experiments using RGB and Lab methods. Methods of research. Standard equipment was used to perform a laboratory experiment to determine the temperature and humidity of tailing dump surface layer samples. Digital photographs were taken in natural light and UV light. At the first stage, the images were processed to obtain the values of the components of two color models, RGB (redness and saturation indices were calculated) and Lab (the color difference index was calculated, two standards of black and white were used). At the second stage, as a “zero” approximation, the simplest (linear) analytical dependence between temperature and humidity was studied. Results and analysis. The coefficients of calculated linear dependences are compared with the corresponding coefficients of direct experimental data processing. It is shown that in natural light: the smallest deviations for the dependence of temperature on humidity correspond to the redness index in the RGB method and the black standard in the Lab method; the smallest deviations for the dependence of humidity on temperature correspond to the saturation index in the RGB method and the black standard in the Lab method. It is shown that in UV light: the smallest deviations for the dependence of temperature on humidity correspond to the saturation index in the RGB method and the black standard in the Lab method; the smallest deviations of the dependence of humidity on temperature correspond to the redness index in the RGB method and the white standard in the Lab method. Conclusions and scope. The mentioned indices and colors of standards can be recommended when processing similar laboratory experiments and natural studies directly on the dusting site.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"34 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90410159","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}

{"title":"Photosynthetic Pigments in Silver Birch Leaves (Betula pendula Roth.) with Technogenic Load","authors":"V. Stasova, L. N. Skripal’shchikova, N. V. Astrakhantseva, A. Barchenkov","doi":"10.37482/0536-1036-2023-3-35-47","DOIUrl":"https://doi.org/10.37482/0536-1036-2023-3-35-47","url":null,"abstract":"The content of photosynthetic pigments in silver birch leaves (Betula pendula Roth.) is studied in areas with technogenic load and in baseline conditions. The research is performed in a forb type of birch forest in the suburbs of Krasnoyarsk. The wood stands exposed to a high level of technogenic pressure are located to the east of the city in the prevailing direction of air mass movement. The reference stands are under the least technogenic pollution and grow in western and northern areas of the city. The photosynthetic pigments are determined in ethanol extracts, calculated per 1 g of absolute dry mass (a.d.m.) of the leaves. A level of dust deposition on leaf surfaces is evaluated according to the method of J. Detrie (1973). The amounts of zinc, lead, aluminum, and fluorine ions are estimated in the washed leaves. It is found that the content of chlorophyll a inside the birch leaves from a relatively clean environment is slightly lower compared to the concentration in the leaves with the technogenic load. The chlorophyll b concentration is 2.5–3 times less than chlorophyll a and is close to the amount of carotenoids. The total chlorophyll content in birch leaves from different locations ranges from 5.4 to 7.3 mg/g a.d.m., the ratio of chlorophyll forms varies from 2.5 to 3, the proportion of net chlorophyll to carotenoids is between 3.4 and 3.8. As the level of dust increases, the content of the total photosynthetic pigments also rises. The accumulation of zinc ions in the birch leaf cells has a negative effect on pigment content, especially chlorophyll a, but doesn’t correlate with the ratio of the pigments. There has not been any correlation found between the lead and the photosynthetic pigments. It is noted that the rise in the concentration of aluminum significantly affects the contents of the chlorophylls and the carotenoids, while no relationship has been discovered between the concentration of aluminum and the proportion of the pigments. The relationship between fluorine and different forms of chlorophyll is absent as well. The results indicate the adaptive response of the photosynthetic system to the presence of pollutants in concentrations below the threshold values that are indicated in the literature. For citation: Stasova V.V., Skripal’shchikova L.N., Astrakhantseva N.V., Barchenkov A.P. Photosynthetic Pigments in Silver Birch Leaves (Betula pendula Roth.) with Technogenic Load. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 3, pp. 35–47. (In Russ.). https:// doi.org/10.37482/0536-1036-2023-3-35-47","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"41 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73068384","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}

{"title":"Optimization of Structural Parameters by Improvement of Pneumohydraulic Fifth-Wheel Coupling Device at Semitrailer Hauling Rig","authors":"V. Nikonov, Valeryi I. Posmetyev, Andrey Yu. Manukovskii, V.V. Posmetyev, Alexander V. Avdyuhin","doi":"10.37482/0536-1036-2023-3-126-139","DOIUrl":"https://doi.org/10.37482/0536-1036-2023-3-126-139","url":null,"abstract":"In this study, the benefits of logging transportation under modern conditions by semitrailer hauling rig are examined, which consists of a truck tractor connected to a semitrailer. Furthermore, an analysis is made of the operational implications of using log road trains in insufficiently arranged road conditions. The article describes the potential scientific directions that can optimize the efficiency of semitrailer trucks. An improved construction of a regenerative fifth-wheel coupling device is proposed. It provides better reliability, reduces fuel consumption for log trucks, and gives better working conditions for drivers, along with reduced dynamic loads between the links of the units that occur during the movement in unsteady modes. The research methodology includes the application of the mathematical framework of multifactorial optimization. The specified analytical formulas are derived to determine the performance efficiency of the regenerative fifth-wheel coupling. It is revealed the connections between the hydraulic cylinder piston stroke values of the regenerative fifth-wheel coupling device, the weight of the loaded semitrailer, the vehicle acceleration during speeding up and braking, and the modifications of the performance indicators of the latching mechanism. The optimal value of the stroke of the pistons of the hydraulic cylinder is determined, which is 200 mm. It provides a power recovery of 6.5 kW and better longitudinal acceleration of the semitrailer at 0.72 m/s2. Moreover, it is found that the change in acceleration during the increase in velocity and braking from 1 to 3 m/s2 gives the change in recuperated power from 2.2 to 6.8 m/s2. At the same time, the average longitudinal acceleration of the semitrailer varies from 0.27 to 0.75 m/s2. Changing the load of the semitrailer from 5 to 25 tons allows increasing the recuperated power from 1.6 to 7.9 kW and reducing the longitudinal acceleration of the semitrailer from 2.8 to 0.53 m/s2. The influence graphs and optimization cartograms present the diameter and hydraulic cylinder piston stroke values of the regenerative fifth-wheel coupling device on the regenerated power and longitudinal acceleration of the semitrailer. According to the optimization cartograms, the average regenerative power is determined using a graph-analytical method. It is equal to 6.5 kW with the diameter of a regenerative hydraulic cylinder of 110 mm and a hydraulic cylinder piston stroke of 200 mm. For citation: Posmetyev V.I., Nikonov V.O., Manukovskii A.Yu., Posmetyev V.V., Avdyuhin A.V. Optimization of Structural Parameters by Improvement of Pneumohydraulic FifthWheel Coupling Device at Semitrailer Hauling Rig. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 3, pp. 126–139. (In Russ.). https://doi.org/10.37482/0536-1036-2023-3-126-139","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"9 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73054727","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}

{"title":"Force Analysis of a Single Grain Cutting Process in Wood Grinding Using Spherical Corundum","authors":"S. Voinash, A. Sergeevichev, Аnna Е. Mikhailova, Еvgeniya О. Ovcharova, V. Sokolova","doi":"10.37482/0536-1036-2023-3-140-154","DOIUrl":"https://doi.org/10.37482/0536-1036-2023-3-140-154","url":null,"abstract":"The productivity of the wood grinding process can be increased by using abrasive wheels with spherical corundum grains. They also expand the area of application of rigid abrasive instruments by reducing soiling and eliminating burns on the treated surface. The studies revealed several advantages of the abrasive wheels over sanding paper: very precise processing, achievement of the desired grade of the treated surface, high durability of the instrument, and low cost. A force analysis of a grinding surface with micro-cuttings made of spherical corundum grains was performed depending on the degree of its wear. The results revealed that chip removal by the spherical corundum grains was possible only under certain conditions when the cutting edges of the grains were exposed. Besides, the theoretical dependencies of forces in micro-cutting were obtained from every principal condition for the process of grinding wood and wooden materials: properties of the spheres, treatment modes, and material-related factors. The special properties were analyzed by the chip formation process and self-sharpening conditions of the spherical corundum wheels. The grain size had the greatest influence on the thickness of chips which were cut by one grain. The grain content and bonding, like other properties of the internal volumetric structure, had a less substantial impact. The abrasive tool characteristics must complement the processed material, such as grain size, hardness, and structure. On the other hand, spherical corundum has optimal physical and mechanical properties for grinding, particularly the thickness of the grain’s edges, which primarily determine the material’s tensile strength. The grinding depth and feed rate mostly define the parameters of the grinding performance of wood and wood-based materials. An increase in those leads to a rise in cutting forces, roughness of the ground surface, a reduction in the grinding length over the period of the wheel’s durability, and the grinding coefficient. If the grinding depth and feed rate are constant, the performance can be improved by increasing the cutting rate. For citation: Sergeevichev A.V., Sokolova V.A., Mikhailova A.E., Ovcharova E.O., Voinash S.A. Force Analysis of a Single Grain Cutting Process in Wood Grinding Using Spherical Corundum. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 3, pp. 140–154. (In Russ.). https://doi.org/10.37482/0536-1036-2023-3-140-154","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"66 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83159266","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}

{"title":"Detritus Inside High Density Pine Stands in the Taiga Forest-Steppe Subzone of Central Siberia","authors":"A. Vais, E. A. Anuev, O. Gerasimova, G. S. Varaksin, S. Mamedova","doi":"10.37482/0536-1036-2023-3-9-20","DOIUrl":"https://doi.org/10.37482/0536-1036-2023-3-9-20","url":null,"abstract":"At the present time, certain harmful effects are observed that affect forest ecosystems. They are forest fires, phytopathogenic activities, and invasive influence, in addition to changes in climatic conditions, in particular an increase in temperature. The study is intended to determine the potential stock of wood and carbon compounds in detritus. The principal categories for it are snags, downed dead wood, and stumps. Additionally, it predicts the amount of wood residues in the conditions of the taiga forest-steppe subzone of Central Siberia. A coarse woody detritus was examined in the structurally pure forests of Scots pine (Pinus sylvestris L.). A circular area of constant radius was used as an accounting unit. The cause woody detritus in snag was 82 %, in downed dead wood was 16 % (1.5–18.3 m3‧ha–1), in stumps was 2 % (0–2.6 m3‧ha–1). The content of detritus was found in only 11 % of the total stock of the stand. The environmental quality at the location of growth had a strong effect on the amount of detritus because of the growth rate of the trees, which is higher in the ideal conditions. Most of the coarse woody detritus (66.4 %) was accumulated in the stands of productivity class I, which was almost double that in the stands of productivity class II (33.6 %). The carbon content in snags, downed dead wood, and stumps was higher in high-density stands (0.81 or more) than in medium-density stands (0.6–0.8). The age and average height of the stand were considerable indicators for predicting stocks of wood and carbon in snags. The amount of wood and carbon in the downed dead wood also depended on the growth density and total stock of wood at the location. The regression equations were generated to predict the volume of the coarse wood detritus. According to the results, it can be concluded that in the investigated stands the destructive processes were identified, which were determined by the concentration of detritus. The production of detritus was activated by both age composition, when a major part of the trees enters the mature or overmature stages, and biogenic factors, which were stimulated by pathogenesis and climatic changes. For citation: Vais A.A., Varaksin G.S., Mamedova S.K., Anuev E.A., Gerasimova O.A. Detritus Inside High Density Pine Stands in the Taiga Forest-Steppe Subzone of Central Siberia. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 3, pp. 9–20. (In Russ.). https:// doi.org/10.37482/0536-1036-2023-3-9-20","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"14 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88597249","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}

{"title":"Influence of Reconstructive Cutting in Deciduous-Spruce Stands on Root Competition of Species","authors":"A. Karpechko, S. Sinkevich","doi":"10.37482/0536-1036-2023-3-99-112","DOIUrl":"https://doi.org/10.37482/0536-1036-2023-3-99-112","url":null,"abstract":"The predominance of mixed forest stands in a productive forest fund, which is located in the middle taiga subzone of Northwest Russia, determines the relevance of an investigation of the growth and development characteristics of the trees. In secondary stands, created by an extensive human consumption of primary spruce stands, spruce trees are generally presented in a minor quantity. The recovery of their dominance is an urgent economic and ecological issue. Despite the unity of approaches concerning the maintenance of deciduous-spruce forests, the research characteristics on the structure of the root systems differ considerably along with age and geographical position. This article investigates a root system competition between spruce and deciduous species in a 70-year-old blueberry-type forest that was 100 thinning by a reconstructive cutting 35 years ago. The mass of fine roots and their distribution in the upper solid layers were examined by the method of soil monoliths in the mixed stands with different proportions of spruce. The numerical characteristics of the stands were determined by the results of a regular complete enumeration on the trail plots. Besides, the tree diameters were measured around the circular plots, which were made for the collection of the monoliths. The records were made on the dynamics of changes in forest floor thickness and vegetation. The relationship between the underground and elevated parts of the stands was explored. It was shown that the roots of spruce can occupy the same ecological niche as the roots of deciduous species. A correlation analysis revealed a statistically significant relationship between the mass of fine spruce roots and the competitive influence of deciduous species, the proportion of spruce in the stand, and its current volume increment. There was a significant difference in spruce root mass under joint growth with birch and aspen. Therefore, it was concluded that this phenomenon has a complex nature. Namely, the mass of the spruce roots has a direct dependency on their closeness to the maternal trees in combination with the spatial heterogeneity of the organic soil layers. The gained findings are important for the regulation of the composition and structure of the mixed deciduous-spruce stands for growing sustainable stands with a high economic value. For citation: Karpechko A.Yu., Sinkevich S.M. Influence of Reconstructive Cutting in Deciduous-Spruce Stands on Root Competition of Species. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 3, pp. 99–112. (In Russ.). https://doi.org/10.37482/0536-1036-2023-3-99-112","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"2 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88556854","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}