Abstract
This study is based on 20 years of research into the massive dieback of coniferous forests (Pinus sibirica Du Tour, Picea obovata Ledeb., Abies sibirica Ledeb., Pinus sylvestris L., Larix gmelinii (Rupr.) Kuzen., Abies nephrolepis (Trautv. ex Maxim.) Maxim., Pinus koraiensis Siebold & Zucc.) in Siberia and the Far East. It was found that the dieback had been provoked by the causative agents of root rot disease (Armillaria mellea s.l, Heterobasidion annosum s.l, Phellinus sulphurascens Pilat., Porodaedalea niemelaei M. Fischer, Phaeolus schweinitzii (Fr.) Pat.). The disease spread due to the decreased biological sustainability of coniferous trees. A. borealis Marxm. & Korh. should be considered the most dangerous species affecting a large variety of woody plants in different forest-site conditions. The trigger mechanism of the dieback was a combination of adverse climatic anomalies and certain edaphic conditions and/or a set of factors favorable for pathogenic organisms.
Published Version
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