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The dynamics of the natural regeneration of pine stands on a recently felled site in the conditions of fresh oak-pine sites in the Kyiv Polissia from the moment of the self-sowing to the formation of forest coenosis is analyzed. The features of growth and current sanitary state of natural regeneration are characterized. It is established that the amount of natural regeneration of pine on a 10-year clear cut is 1.5-2 times higher than the initial density of traditional planted forest under such forest sites and is sufficient to reproduce high-yielding pine trees in the study area. In comparison with planted pine more age and territorial biological diversity of natural regeneration has been observed. This, in turn, will increase the resilience of forest ecosystems in the face of global climate change, leading to forest degradation and widespread pine dieback. The results of the studies indicate a favorable effect on the conservation and growth of the natural regeneration of the pine forest microclimate of the adjacent forest walls, first of all, the mother plantations adjacent to the eastern side. The dynamics of the amount of natural regeneration of pine depends, to a large extent, on the peculiarities of the change of coenosis features on the area. During the first four years, as the non-forest herbaceous formations increase, there is a 20% increase in the loss of self-seeding. A decrease in the intensity of loss of natural regeneration of pine has been found, beginning from the fi􀅌h year, it is mainly caused by the restoration of the area and features of forest coenosis on individual facies with the highest density of undergrowth a􀅌er its closure. A number of conclusions and suggestions have been made regarding the use of natural forest regeneration for the reproduction of biologically stable pine stands in the study area. In particular, it is determined under what factors it is possible to obtain a satisfactory natural regeneration of pine in the conditions of a fresh oak-pine site of the southern part of the Kyiv Polissia. [ABSTRACT FROM AUTHOR]

The current significant deterioration of the sanitary state and the degradation of Ukraine's forests is conditioned by massive dieback of trees and stands of pine and other forest species in conditions of global warming. It is urgent to carry out organizational measures and works to improve the biological stability of future forest ecosystems during the whole process of their cultivation, starting from the moment of their natural or artificial regeneration. Trees and stands dieback was observed earlier in the 19 and 20 centuries, but in most cases it occurred at the regional level. However, since 1970 in many countries dieback has been observed on large areas. In such a case different reasons are called as trees and stands dieback factors: climate change, groundwater reduction, pests and pathogens harmful activity etc. Goal of research - based on literature data and own research results to establish and substantiate etiology and pathogenesis of massive dieback of trees and forest-forming species stands, in particular, pine stands, and to propose strategy and tactics for preventing this negative natural phenomenon. During program tasks implementation a number of scientific papers, where various aspects of massive dieback of trees and stands were highlighted, have been analyzed. Basic theoretical positions and practical recommendations outlined in the article are based on the results of our own research on oak stands dieback in Kyiv green zone in the 1980s and current pine dieback in Polissya. The research has allowed us to offer our own concept on this negative natural phenomenon etiology and pathogenesis. All the highlighted drying factors according to peculiarities, activity sequence and their specific meaning were combined into three groups: 1. Weakening circumstances and risk factors for disease. 2. Etiofactors or dieback origin. 3. Trees and stands dieback catalysts. Generalization and studying all factors take into account global warming. This has allowed proposing measures to improve the biological sustainability of future forests at the stage of their regeneration. Understanding and using the abovementioned statements on etiology and pathogenesis of trees and stands of forest-forming species mass dieback will allow to preventively apply scientifically based silvicultural measures that exclude the above mentioned weakening and risk circumstances and, thereby, to prevent the prime cause of the harmful effects. This will allow minimizing negative consequences of pathogenesis and reduce possible resource, environmental and social losses. [ABSTRACT FROM AUTHOR]

Within this research we substantiate the importance and relevance of plantation forestry in the context of the forest restoration process and effective use of land resources, intensification of forestry production. The attention was paid to the historical aspects of plantation forestry, when repeated attempts were made to create plantations of fast-growing species, including poplars, both in sparsely forested and industrially developed regions. The main purpose of the research is a preliminary expert assessment of the suitability of the tested poplar cultivars for plantation forestry in conditions of fairly infertile oak site type of the northern part of the Right-Bank Forest-Steppe zone based on features of rooting and growth of cultivars' planted cuttings in test plantations, starting with the phase of engraftment. We indicate that the program tasks research was carried out using the techniques commonly used in forestry and general scientific methods: analysis, synthesis, comparison and generalization of the collected scientific materials. The suitability of some poplar cultivars for cultivation in fairly infertile oak site type is evaluated by means of phytoindication method. We have characterized the features of lignified cuttings' rooting and growth of one year-old planted cuttings of different poplar clones in test forest plantation in conditions of a wet fairly infertile oak site type of the Kyiv Forest-Steppe zone. We have carried out the preliminary expert scientifically based assessment of suitability of certain poplar cultivars of domestic and foreign breeding for the wet fairly infertile oak site type. We have determined that among the experimentally tested poplar cultivars in the conditions of the research region in the phase of engraftment, a better cuttings' rooting process and a more intensive growth of planted cuttings were demonstrated by clones 'Ijzer-5' and 'Ghoy'. Worse rooting was inherent to the clones 'I-214' and 'I- 45/51', and slower growth of one year-old poplar planted cuttings was registered for clones Toropohritski, 'San Giorgio' and 'Blanc de Poitou'. A logical explanation of the revealed features is the specific regards of the mentioned cultivars to the soil fertility and moisture content, which shall be considered on the stage of plants selection for poplar plantations. [ABSTRACT FROM AUTHOR]

The peculiarities of rooting of wooded cuttings and preservation of planted cuttings of different poplars clones of plantations are characterized in the conditions of Chernihiv Polissia. It has been carried out preliminary expert scientifically sound assessment of the suitability of using certain cultivars of poplar among clones of domestic and foreign breeding tested in test cultures for plantations establishment in conditions of wet fairly infertile pine site type and fairly infertile oak site type. It is determined that for establishing of forest plantations in the conditions of wet fairly infertile pine site type it is more efficient to use poplar cuttings of Toropohrytskii clone, and in the conditions of the wet and fairly infertile oak site type besides the mentioned cultivar, the clones 'Blanc de Poitou', 'Serotina' and 'San Giorgio' are better. [ABSTRACT FROM AUTHOR]

The results of the appearance, growth and state of natural regeneration of Scotch pine on the former low-quality hayfields, which are located on the eroded lands of the ravine-gully systems of the Dnieper. [ABSTRACT FROM AUTHOR]

The growth of cuttings seedlings, tested cultivars S. Viminalis L. in wet trophotopes on test plantations, laid down in the northern regions of the Right Bank Forest-steppe of Ukraine [13; 14; 15]. It is concluded that the cultivars differ in the best growth: S. Viminalis L., Inger, Panfilska, Ternopil, S. Viminalis of Belgian origin [11]. [ABSTRACT FROM AUTHOR]

Productivity and shoots output of 17 poplar cultivars in plantations with “stump” type of management are characterized. The expediency of their use for biomass production and planting material (cuttings) output were evaluated. The optimum height of mother plant’s stump to ensure the greatest productivity of most cultivars is range of 1.0 to 0.5 m. Cultivars ‘Ghoy’ and ‘I -214’ are appropriate for wood biomass production in the examined region. Cultivars ‘Ghoy’, ‘Marilandika’ and ‘Ijzer-5’ are the most productive for planting material (cuttings) store. [ABSTRACT FROM AUTHOR]

He aim of those research work istesting and selection of the best quick-growing plants Salix L. family for plantation forest growing at the conditions of Kiev and Vinnitsa regions. For the purposes of those experiment 10 trials runs of the fast growing willow have been selected from four different countries: Ukraine, Poland, Belgium and Sweden. After check measurements on13.05.2016 and 06.08.2016 we have abstained three trial runs of willow which in growth surpassed by fat other experimental samples. The findings of the best three trial runs are 57% higher in height growth and 29,5% in cingulum growth. [ABSTRACT FROM AUTHOR]

The effect of different doses and methods of fertilization while nutrition in subors conditions of Volyn Polissya on annual poplar growth and changes in the studied parameters during the vegetation season were studied. [ABSTRACT FROM AUTHOR]

The results of testing the effectiveness of different modifications of the composition of substrate for rearing («recuperation») standard pine seedlings with open root system with a view to extending the planting crops and raising the survival rate of plants planted in late-spring and summer-early hour time. [ABSTRACT FROM AUTHOR]