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NATURAL REGENERATION OF PINUS SYLVESTRIS L. FROM SEED TREES IN POOR MINERAL SOILS
Abstract
In economic forests, the productivity of forest stands should be increased as much as possible, because the global demand for timber is growing every year. Planted forest trees can be realized using the advantages of selection, naturally regenerated - faster growth can be achieved by improving the growing conditions and limiting factors that reduce or delay the formation of growth. Data were collected in 6-year-old P.sylvestris forest stands Cladinoso-callunosa and Vacciniosa. The plots were established in an area of 17.2 ha (R=7.98 m; S=200 m2), each with a seed tree in the center. The aim of the study is to evaluate the effects of left seed trees and soil preparation in furrows on the natural regeneration of Pinus sylvestris in poor mineral soils Cladinoso-callunosa and Vacciniosa. Pine trees that reached a height of 10 cm were measured for height and annual growth, diameter at the root neck, and a specific location in the plot (in the furrow or in unprepared soil and under or outside the canopy of seed trees). The diameter, height, number of seed trees, as well as the importance of the effect of the crown of seed trees and soil preparation on the natural regeneration of pine were calculated The dendrometric indicators of seed trees were calculated, the significance of the influence of the crown of seed trees and soil preparation on the natural regeneration of pine was determined. It has been established that when restoring a forest stand from left seeds of seed trees, soil preparation is necessary for both Cladinoso-callunosa and Vacciniosa, because the number of trees in the furrows is significantly higher, as well as the annual and average growth of tree height both under the crown of the seed tree and outside it ( p less than0.05) than in untreated soil. Compared to under the crown of the seed trees, the annual height increases of the Scots pine are significantly lower, therefore the seed trees should be cut down sooner up to the age of 6 than in the current practice, so as not to interfere with natural regeneration.
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