Co-Filtering of the Tree-Ring Series Pinus Sylvestris L. from Sites with Optimal Growth Conditions

Abstract

Using the algorithm of co-filtering which is based on the essential properties of the series we obtained the common signal from tree-ring records and analyzed it. We propose to use the sign of the coefficients of the basic functions in Fourier transform as the essential properties of the series under study. We analyzed tree-ring records of 263 trees (518 radii) from the southern subzone of taiga, where the tree growth conditions are optimal and obtained the results: (1) age of trees and competitive interactions between them influenced on 60.2% variability of tree-ring widths; (2) the common signal influenced on 36.3% variability of tree-ring widths; (3) temperature and precipitation were able to influence on the synchronous growth of trees in the summer and in the winter. In the second part of XX century (1956-2005) the highest values of common signals were in the years with warm and dry autumn, warm and snowy winter, warm and dry spring and the late summer, cool and wet summer. Mean temperature and precipitation from autumn to spring made valuable contribution in variability of tree-ring width because they can influence on the conditions of early growth season.

Keywords

• synchronism
• algorithm of co-filtering
• optimal conditions of tree growth
• Scotch pine
• West-Siberian plain