Assessment of morphometric indices in the second generation of Scots pine trees in the Chernobyl exclusion zone

A series of morphometric indices was studied in Scots pine trees, which are the second generation of trees that were severely exposed during the Chernobyl accident to doses of 4–5, 10–20, and 80–100 Gy. The variability of the length and weight of the needles, curvature of the sprouts, tree height, and trunk circumference were studied in 2011–2014. Needle gigantism, one of the typical radiomorphoses, was observed in 2012 and 2013 in all groups of trees. Tree height and trunk circumference in groups of 4–5 and 10–20 Gy was significantly higher than in the control group.