The condition and productivity of stands Pinus sylvestris and Robinia pseudoacacia of natural reserve “Dniprovsko-Orilskyy”
Keywords: silvicultural-taxational index, forest types, age structure, bonitet, stock stands
AbstractOrilskyy forest district is part of the natural reserve "Dniprovsko-Orilskyy”. Its territory is within the left bank (gorge) Barrens. In Orilskyy natural reserve white acacia (Robinia pseudoacacia L.) forest occupies area of 97,6 ha. Except the white acacia, forest planning is formed with species from coniferae – pine (Pinus sylvestris L.), which occupies area of436,6 ha.According to the basic material of forest Orilskyy natural reserve, the white acacia forest is concentrated in three edaphotops В3, С0-1, D0. Acacia white forms stands in terms of very dry, dry and moist hihrotops. Most of the planting area of analyzing kind is in moist conditions hihrotop (B3) – 59,6 %. Stands of pine concentrated in three trofotop – A, B, C and three hihrotop – 1, 2, 3. The largest part of the stands – 81,0 % – formed in subir.A third area of white acacia is represented by pure stands with coefficient of composition “10”(33,4 %). Predominant stands for the pine also appeared pure stands with ⅔ occupied area.The existing forest site conditions are not enough favorable for the formation of high-productivity white acacia and pine stands, which is evidenced by the area distribution analyzed type for the II and III class of bonitet.Forestdensities are dominated high densities and middle densities as of white acacia stands, well as pine.Result of analysis of the age structure of white acacia and pine in reserve permits to claim about the irregular dispatching areas occupied by age group for these breeds and absence of specific age group. The largest area of acacia is occupied by stands of overmature specimens – 89,9 % of the total area in reserve, the pine – the middle-aged stands (56,1 %).
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