The article focuses on the problem of structure degradation and ecosystem functioning – the urgency that identifies the relevance of operations at a strategic level aimed at providing the integrated assessment of ecological stability of water. Determination of water quality indicators were divided into blocks according to the criteria of salt composition, according to chemical saprobological indicators and the content of specific substances of toxic and radiation action. According to the results of block analysis, the integrated ecological index of water quality was determined by the dependence of water quality on the indicators of ecological stabilization of the landscape and the structure of biotechnical elements. The article determines the relationships between worsening quality of surface waters and stabilization or destabilization of the landscape structure. The research was conducted on medium and large streamflows on the Right Bank of Polesie region of the Dnieper-River cascade within which the tracts of land were identified and the landscape ecological stability (CESL1) and landscape biotechnical elements coefficients (CESL2) were determined. The retrospective analysis was performed of the surface water features on the Right Bank of Polesie region of the Dnieper-River cascade and the main trends in salt block indicators, trophic and saprobiological block indicators, and in the content of toxic and radioactive substances at observation sites were estimated. Based on obtained data, the integrated assessment in trends of surface water quality on the Right Bank of Polesie region of the Dnieper-River cascade was made and the main parameters and scale of stabilization and destabilization of landscape impact on the water quality formation were defined.

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The article presents results of the research and mathematical modelling of the rainfall erosivity factors. Erosion, whether water, wind or resulting from soil cultivation, includes three processes -soil descaling, movement and sedimentation. Spatial characteristics of precipitation during two researched periods are similar, having certain quantitative peculiar features. A common feature is maximum precipitation in the southwest and to a lesser extent in the eastern part of the region. Minimum precipitation is typical for the western part of the region. Peculiar feature of the second period of research is increase of contrasting effect of precipitation regime, when minimum values of precipitation decrease and maximum ones increase. Enhancement of contrasting effect of precipitation in space or time may cause increased intensity of erosion processes to the extent where the intensity of precipitation increases due to such contrasting effect. Thus, doubtless interest lies in the research of greater spatial or time contrasting effect of precipitation regime to activate water erosion. Thus, spatial peculiarities of distribution of precipitation within territory under study and time patterns correlate, but have their own special features. Clearly, total amount of precipitation as well as time distribution as a marker of correlation of intensification factor of erosion processes and defence mechanisms of vegetative cover are dominant for total losses of soil due to erosion. Coincidence of time of intense precipitation in summer and availability of vegetative cover reduces erosion. Nevertheless, continuance of intense precipitation when harvesting is started may cause intensification of water erosion of soil. Use of spatial variables and regression equations for spatial data calibration helped to estimate the spatial variation of precipitation on the territory under study. Comparison of two periods of research showed that in 2010-2016 significant reduction of rainfall erosivity factor has taken place in comparison with the previous period 9.6-65.4 MJ mm ha -1 h -1 per year. In Turiyskyi and Kovelskyi district changes in rainfall erosivity factor were minimal (9.6 and 16.7 MJ mm ha -1 h -1 per year respectively). Conversely, in Ivanytskyi and Gorokhivskyi districts changes were the most significant -58.1 and 65.4 MJ mm ha -1 h -1 per year respectively.

The sanitary condition of pine plantations in the conditions of Polissia of Ukraine was assessed. Derevostan grows in different types of forest vegetation conditions B2GDS, B3GDS, C2GDS, C3GDS. According to the data of 27 circular trial plots, which were established during 2018–2020 in the territory of the State Enterprise Zhytomyr LH Berezivske Forestry, the State Enterprise Korostyshivsk LH Ivnitske Forestry, the State Enterprise Korostensky LH APC Melenivske Forestry, which covered the typical growing conditions of pine plantations of Zhytomyr Oblast. The index of sanitary condition showed that the pine forest belonged to strongly weakened stands. Analyzing the sanitary condition during the research period, it is worth noting that in 2018, the tree stand of the plantations in the Ivnytsia Forestry was weakened, and the average index was 2.42. In Berezivsk and Melenivsk forests, the sanitary condition index was 2.58 and 2.67, which indicates that the degree of damage is average, and the plantations are strongly weakened. Based on the results of the research, it was established that in 2019 the sanitary condition in the Bereziv forestry improved and amounted to 2.12. By state category, the largest number of I category is 2019 – 40.0 %, 2019 II – 27.6 %. In the Ivnytsia forestry, the sanitary condition index was 2.52, the plantations were greatly weakened. In the Meleniv Forestry, the average sanitary condition index of 2.44 indicates that the tree stand is weakened. It is proven that in 2020 the sanitary condition improved compared to other years of research and amounted to 2.11. In Ivnytsia Forestry, the sa-nitary condition remains very weak. In the Meleniv Forestry, the average sanitary condition index was 2.29, which indicates that the tree stand is weakened. It has been established that pests, diseases and forest fires are the biggest deterioration of the sanitary condition in the territory of Zhytomyr Oblast. To prevent the development of these negative factors, it is necessary to create mixed pine plantations, to carry out timely felling of forest care. Key words: condition categories, sanitary condition index, type of fo-rest vegetation conditions, completeness, Scots pine.

Objective. To research the influence of bioorganic composition Bioekofunge-1 and cerium dioxide nanoparticles on growth and development of planting material of Scots pine (Pinus sylvestris L.). Methods. Biotechnological, environmental, virological and microbiological methods. Results. The stimulating effect of Bioekofunge-1 and cerium dioxide nanoparticles on planting material of Scots pine, namely acceleration of growth and development of both aboveground and underground organs of pine plants, has been demonstrated. Specifically, we have found that treatment of Scots pine seedlings with 0.5 % Bioekofunge-1 solution results in average increase of height by 39.05 % and average increase in weight of roots by 51.85 % compared to the control group treated with water. Also, we have shown that treatment of Scots pine seedlings with 0.5 % Bioekofunge-1 solution and 0.001 % solution of cerium dioxide nanoparticles results in increase of height by 31.25 % and average increase in weight of roots by 23.49 % compared to the control group treated with water. Our research has brought to light antipathogenic and healing effect of integrated treatment with cerium dioxide nanoparticles and bioorganic composition Bioekofunge-1, namely 3-7 % of Scots pine seedlings in the control group had ring rotting near the root collar, which was absent in the seedlings, which were treated with 0.5 % Bioekofunge-1 solution and 0.001 % solution of cerium dioxide nanoparticles. At the same time, soil environment in which the plants of the control group were grown, was contaminated with pathogens of different taxa, while soil environment where plants treated with both Bioekofunge-1 and Bioekofunge-1 in combination with cerium dioxide nanoparticles were grown, did not contain pathogens. Conclusion. Applying both Bioekofunge-1 and Bioekofunge-1 in combination with cerium dioxide nanoparticles is an effective way to obtain healthy planting material of Scots pine. It was established that these agents stimulate the growth and development of Scots pine plants.