Параметри крон дерев експериментальних соснових культур, створених з різною густотою у Житомирському Поліссі

The research has been conducted in Zhytomyr Polissya at stationary experiment № 1. Some parameters of tree crowns such as diameter, projection area and length of the crown and canopy closure of Scots pine (Pinus sylvestris L.) plantations with density 4000, 2000 and 1000 trees·ha-1 were analysed. Tree crown parameters were measured in the experiment according to common forestry and forest taxation methods. We have defined that with the density plantation 4000 trees·ha-1 average crown diameter ranges from 2.4 to 2.7 m, with stand density 2000 trees·ha-1 – 2.9‑3.1 m, and with stand density 1000 trees·ha-1 – 3.6‑4.0 m, the difference between these values ranges from 9 % to 40 %. We have also proved the true difference between the average tree crown diameters by single factor ANOVA at 95 % confidence interval, where Fф = 7.82…126.03 > Fт(0.95) = 3.89. We have demonstrated that with plantation density 4000-2000 trees·ha-1 the form of crowns is oval (compressed in the line and elongated interstitial), where the plantation density 1000 trees·ha-1 – is almost round. There are some exceptions, i.e. plantations with the density 2000 and 1000 trees·ha-1, where crowns are formed one-sided toward the southwest. We have also revealed, that the average crown projection area with plantation density 4000 trees·ha-1 is 5.5‑6.1 m2, but with plantation density 1000 trees·ha-1 – 10.6‑13.1 m2, the difference between given parameters ranges from 42 to 58 %. We confirmed the difference between the values of tree crown projection area ANOVA, where Fф = 8.0…108.7 > Fт(0.95) = 3.89. We have diagnosed that crown length with plantation density 4000 trees·ha-1 is 4.1‑5.1 m, with plantation density 2000 trees·ha-11 it is 5.0‑6.6 m, and with plantation density 1000 trees·ha-1 it is 5.1‑8.1 m, the difference between the given values ranges from 9 to 43 %, in some cases it is small or absent. Therefore, the canopy closure of plantations with various densities is from 0.80 to 0.93, the difference between the given values in the variants ranges from 1 to10 %. We have made the conclusion that the density influences average diameter, projection area and length of tree crowns, whereas the influence of density on the canopy closure of the plantation is not found.