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Contemporary Problems of Ecology

2015 year, number 4

Biotic and Abiotic Factors as Causes of Coniferous Forests Dieback in Siberia and Far East

I. N. PAVLOV1
V. N. Sukachev Institute of Forest SB RAS, 660036, Krasnoyarsk, Akademgorodok, 50/28
Keywords: root rot disease, edaphic anomalies, climate change

Abstract

The study was based on 20 years of research of 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 ( Armillaria mellea s.l., Heterobasidion annosum s.l., Phellinus sulphurascens Pilat ., Porodaedalea niemelaei M. Fischer , Phaeolus schweinitzii (Fr.) Pat.). The disease spread due to 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. 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.