Morphophysiological features of Pinus sylvestris L. in artificial plants on dredge dump after gold mining

The results of studying the morphophysiological features of Pinus sylvestris L. in artificial plantations on the dredge dump of the Uvalnoye alluvial gold deposit are presented. It is shown that under the conditions of the dump there was a decrease in morphological parameters, such as tree height, annual growth, trunk diameter and needle length. The forest stand of P. sylvestris L. that forms on the dump belongs to the Va class of bonitet. The main anatomical reactions of needles in the conditions of the dump are presented: a decrease in the number of resin canals with an increase in their diameter, a decrease in the diameter of the central cylinder and the area of the mesoderm. It was revealed that a significant decrease in the content of total nitrogen and green pigments in the needles of P. sylvestris L. was observed on the dredge dump compared to the control habitat. It is noted that the main limiting factors in the conditions of the dump are the low water-holding capacity of the substrate, the lack of calcium, magnesium and organic carbon.