Koval I. M.

Purpose of the work is to study the response of the radial growth of pine in the young to the effects of fires. Methods. Comparative ecological methods, taxation, standard dendrochronological methods, statistical, correlation and regression analyzes were used. Results. The study was conducted in a clean, young pine stand, which was damaged by wildfire in 2011. The wildfire occurred in favorable weather conditions (the vegetation season was warm and humid), which led to mitigating the effects of fire on the plantings. It was revealed that the radial increment of damaged trees in the year of wildfire (2011) was less than the tree rings at the control by 20%. During 2012-2017 increase of the radial growth of damaged trees was revealed because about 30% of trees were drying and living trees got extra light and reveal. Radial growth of survived trees reached the level as before the wildfire. Late wood responded faster to fire damage. Conclusions. The wildfire led to the death of weakened trees, significantly speeding up the process of natural thinning of the stand. The recovery of the radial growth of surviving trees occurred in 2014. Restoration of the radial growth of trees, survivors, occurred in 2014. It is advisable to use the proportion of late wood to assess the state of plantations after a wildfire.

Purpose of this research was to detect influence of climatic change on pine radial increment in stand in the Left-bank Forest-steppe of Ukraine as example 100-years-old stand at State Enterprise 'Kharkiv forest scientific research station’. Methods. Dendrochronological. Method of correlation function and multiple regressions (re-sponse function) were used to analyze the influence of climatic factors on tree radial increment. For this purpose computer program RESPO was used. Results. Tree ring series were built and were used for correlation analysis between climatic factors and pine radial increment for two periods: 1960-1988 and 1988-2016.Years of mini-mum (1933, 1942, 1956, 1972, 1976, 1976, 1987, 1992, 2002, 2006 та 2012) and maximum (1933, 1942, 1956, 1972, 1975, 1976, 1979, 1979, 1979, 1987, 1992, 2002 та 2012) of radial increment were detected. Depressions of pine radial increment were as a result of negative weather conditions: low and high winter and early-spring temperature, droughts during vegetation period. Maximums of radial increments were depended on favorable weather conditions for pine radial growth. Correlation and Response analysis for two periods showed that increase of temperature and precipitation, excluding winter precipitation, changed response of forest ecosystems to climatic change: if in first period (1960-1988) radial increment limited by April temperature and together July temperature positively influenced on radial growth, in second period (1988-2016) June temperature negatively infuenced on radial increment. Slight increase precipitation during vegetation period could not soften impact if high temperature during vegetatation period on tree radial increment. Conclusions. At comparison 1960-1988 and 1988-2016 it was detected that during first period positive influence of summer temperature on radial growth was distinctive and for second period one started to limit increment (negative influence) were detected. Slight increase of precipitation for vegetation period in second period significantly didn’t influence on pine radial growth. In second period increase of winter temperature and number of thaws negatively influenced on soil moisture, decreased of tree ring widths.