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SCOTS PINE (PINUS SYLVESTRIS L.) RESPONSE TO CLIMATE CHANGES AND THINNING ACTIVITIES: A TREE-RING STUDY FROM SOUTH-EAST RILA MOUNTAIN, BULGARIA

Dimitar Dimitrov, Tzvetan Zlatanov, I. Raev, N. Stoyanova, Silvia Miteva

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Abstract

As a result of the study, the Scots pine (Pinus sylvestris L.) local chronology in ‘Vasil Serafimov’ Ecological Station (Southeast Rila Mountains, Bulgaria) was extended with 21 years, till 2008. A significant relationship (α < 0.01) was ascertained between tree-growth indices (ITR) of the Scots pine and precipitation indices (IP), temperature indices (IT) and presence of Norway spruce (Picea abies (L.) Karst) understorey (SU). Initially, pine decreased its radial growth rate as a consequence of the drought started in 1993. Removal of Spruce understorey in the middle of the dry period (1995), however, positively influenced Scots pine radial growth since 1997. The cooler and wetter years from 2001 to the end of the studied period resulted in increased growth rate for the pine.

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What this paper is about

As a result of the study, the Scots pine (Pinus sylvestris L.) local chronology in ‘Vasil Serafimov’ Ecological Station (Southeast Rila Mountains, Bulgaria) was extended with 21 years, till 2008. A significant relationship (α < 0.01) was ascertained between tree-growth indices (ITR) of the Scots pine and precipitation indices (IP), temperature indices (IT) and presence of Norway spruce (Picea abies (L.) Karst) understorey (SU). Initially, pine decreased its radial growth rate as a consequence of the drought started in 1993. Removal of Spruce understorey in the middle of the dry period (1995), however, positively influenced Scots pine radial growth since 1997. The cooler and wetter years from 2001 to the end of the studied period resulted in increased growth rate for the pine.

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Available abstract

As a result of the study, the Scots pine (Pinus sylvestris L.) local chronology in ‘Vasil Serafimov’ Ecological Station (Southeast Rila Mountains, Bulgaria) was extended with 21 years, till 2008. A significant relationship (α < 0.01) was ascertained between tree-growth indices (ITR) of the Scots pine and precipitation indices (IP), temperature indices (IT) and presence of Norway spruce (Picea abies (L.) Karst) understorey (SU). Initially, pine decreased its radial growth rate as a consequence of the drought started in 1993. Removal of Spruce understorey in the middle of the dry period (1995), however, positively influenced Scots pine radial growth since 1997. The cooler and wetter years from 2001 to the end of the studied period resulted in increased growth rate for the pine.

Key concepts: Scots pine, Thinning, Pinus <genus>, Picea abies, Karst, Forestry, Dendrochronology, Environmental science

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SCOTS PINE (PINUS SYLVESTRIS L.) RESPONSE TO CLIMATE CHANGES AND THINNING ACTIVITIES: A TREE-RING STUDY FROM SOUTH-EAST RILA MOUNTAIN, BULGARIA — Research Paper | ScholarLens