Features of drying out Norway spruce stands in Novgorod-Seversky Polissya and distribution of Ips typographus in them
Journal Title: Лісівництво і агролісомеліорація - Year 2012, Vol 121, Issue
Abstract
In spruce stands of Novgorod-Seversky Polissya weakening and dying trees have been registered recently due to dry periods. Prolonged drought at the beginning of the growing season, from April to June, was critical for Norway spruce. Mass drying of spruce occurred 1–2 years later after the end of the dry periods. Spruce stands having middle-age and approaching maturity, with a part of spruce over 60%, dry out in the main. Drying has the group nature, but it becomes continuous during the growing season. Focuses of drying out in stands are spread mainly from forest border in the north-east for a distance of 15–20 meters per month. In the drought-weakened spruce stands there is growth in the number of Ips typographus, which deepens the spruce phytocenosis disorder. During sanitation felling of drying out foci adjoining strips of stands of 50 m in width are to be felled.
Authors and Affiliations
I. Porohnyach
Keywords
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