FEATURES OF RADIAL GROWTH OF TURANGA IN THE FLOODPLAINS OF THE ILI AND SYRDARYA RIVERS (KAZAKHSTAN)
V. E. Benkova1, R. S. Akhmetov2, A. V. Shashkin1, J. S. Dukenov2, D. V. Ovchinnikov1, A. V. Benkova1, D. A. Dosmanbetov2, M. A. Uashev2, E. A. Shashkin2, Yu. V. Kladko1, D. A. Mashukov1
1Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of Science, V. N. Sukachev Institute of Forest, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
2A.N. Bukeikhan Kazakh Research Institute of Forestry and Agroforestry, Almaty, Kazakhstan
Keywords: climate change, Populus diversifolia Schrenk, tree ring width, air temperature, precipitation, modification of climate response
Abstract
The results of a study of the impact of current climate change on the dynamics of turanga (syn. Euphrates poplar), Populus diversifolia Schrenk) radial growth of trees in tugai forests (a form of riparian forest of semi-arid area) of Kazakhstan are presented. The studies were carried out in the study sites (SS) within the floodplains of the Ili river and the Syrdarya river. It has been revealed that since the beginning of intensive warming and aridization of the climate since the late 1990s, the radial increment of Turanga growing in the SS “Ili” has decreased 4-fold, while in the SS “Syrdarya” - 2.5-fold. Climate correlation response functions revealed that climate change since the late 1990s modified reaction of the trees to climate factors in the SS “Ili”. This was expressed in the appearance of their negative reaction to increased April-July air temperatures and a positive reaction to increased June precipitation. Current climate change has not affected the climatic response of trees in the SS “Syrdarya”. Thus, it is shown by dendrochronological study of Turanga that in some cases the response of woody species to climate warming could be offset by other, factors, for example, deficit of available soil moisture and anthropogenic impact. It is assumed that the radial increment values of Turanga trees can be used in the studies of the influence of various hydrological regimes of rivers on tugai forests productivity.
|
