Scots pine provenance trial have been established in the Republic Buryatia (West Transbaikalie). The provenance trial was established in a forest-steppe site near southern Scots pine distribution border (Lat. N52º, Long. E110º). One involved progenies of 50 climatypes representing a considerable part of Scots pine distribution including 27 climatypes from the European Russia, 28 – from Siberia, 1 – from Kazakhstan, and 3 – from the Russian Far East.
The analysis of height increment indices in separate contrasting on hydrothermal regime vegetal seasons allowed as to estimate the tempo of Scots pine climatypes growth in connection with fluctuation of weather factors and reaction to stress caused by deficit of moisture.
To study the problems of adaptation the analysis of survival of Scots pine climatypes in connection with one of the enumerated above features - annual height increment – is of a special interest. Correlation coefficients reflect positive connection of climatypes survival with increment indices (R=0.55 and R=0.58 for subspecies of Pinus sylvestris L. – ssp. sibirica Ldb. and ssp. lapponica Fries. correspondingly). Climatypes of these subspecies are also characterized by positive connection of average closeness (R=0.62 and R=0.71 correspondingly) of continentality indices of climatypes origin region with increment indices. This dependence is caused by hereditary adaptive reaction of ssp. sibirica to stressful climatic factors, which are peculiar to extreme continental climate. Similar reaction of ssp. lapponica climatypes along with the continentality of climatypes’ origin regions is also conditioned by the other climatic factors – redundant humidification and low warmth supply. A negative connection between these indices is characteristic for the ssp. sylvestris climatypes , which grow in optimal and close to optimal conditions. Hence, average closeness of positive connection in general is peculiar to the series of climatypes, whose origin regions differ sufficiently by hydrothermal regime or continentality of climate.
The analysis results showed that decrease of mass of stems share in relation to common phytomass is an adaptive reaction of Scots pine stabilizing its survival and testifying to the highest ability of single climatypes to resist the impact of unfavorable natural and climatic factors including the area of the experiment (West Transbikalie).
The given regularity is not typical of marginal populations growing in pessimal conditions of rigid limit of natural and climatic resources. To such climatypes the following ones bear a relation: Yakutsk (Yakutiya), Kandalaksha (Murmansk territory), Turukhansk (Krasnoyarsk territory)m Urumkai (Kokchetav territory) and Kamyshin (Volgograd territory). Mist of them are weakly resistant in new conditions (survival is 21-40%).
Analyzing the data obtained in the years of observation one can note that closeness of positive connection between average values of annual increment of 57 investigated climatypes and duration of vegetation periods in their origin places increases with improvement of humid provision.
The annual correlation coefficients obtained for 5 years of observations (1979-1990): R=0.37, R=0.08, R= 0.22, R=0.61, R=0.53 showed that maximal closeness of positive connection of those indices (R=0.61) is observed in the most humid provided 1985.
Note. Abstracts are published in author's edition