Recurrence of Severe Droughts and Long-Term Dynamics of Radial increment of the Scots Pine in the Usman and Khrenovoe Forests in the Voronezh Region

• Main Authors: Sergey M. Matveev, Svetlana V Matveeva, Yuriy N. Shurygin
• Format: Article
• Language: English
• Published: Siberian Federal University 2012-03-01
• Series: Журнал Сибирского федерального университета: Серия Биология
• Subjects: Voronezh region; droughts; precipitation; air temperature; hydrothermal coefficient; solar activity; cyclicity; Pinus sylvestris; dendroclimatic analysis
• Online Access: http://elib.sfu-kras.ru/bitstream/2311/3006/1/03_Matveev.pdf

Studied the cyclic dynamics of limiting growth trees climatic factors (using a series of observations of weather station Voronezh) and the growth of Scots pine stands in the Usman and Khrenovoe pine forests of the Voronezh region. The conditions of severe drought and weather conditions of the fire in 2010 in Voronezh have been analyzed. In the secular dynamics of droughts (and radial increment of Scots pine) in the Сentral forest-steppe region easily traced cycles: the 11-year (solar or Schwabe- Wolf), magnetic (Hales), Brikners with important prognostic value. Since the mid-1970-s variations in climatic factors (precipitation during the warm period, the moisture conditions presented by hydrothermal coefficient) in the Central forest-steppe are in phase with the 11-year cycle of solar activity. The main meteorological factor affecting the growth of pine trees forming a precipitation of the warm period (April-October). Radial increment of Scots pine response to drought conditions simultaneously or with a delay of one year. Severe drought in the forest-steppe zone (1939, 1972, 2010 years) observed only after two or three or more years with a significant lack of rainfall and necessarily accompanied by increased relative to the norm air temperatures. The drought in 2010 resulted from the decrease in precipitation from 2007 to 2009 (509, 485, and 428 mm, respectively, at the normal 570 mm) and abnormally high temperatures of summer 2010. One of the reasons for the temperature anomalies of summer 2010 likely is the overlay of minimum of 11 years and centuries-old cycles of solar activity (2008).