Repin E.N.
Scientific Life 2018; (9): 60-66
The area of Korean pine Pinus koraiensis (Siebold et Zucc.) 10 climatic types of geographical cultures in Primorsky Territory is located near the arboretum “Gornotaezhnaya” (Mountain-taiga) station of the Far East Branch of the Russian Academy of Sciences. The plants grow here compactly, ordinary plantings in the same conditions. The objective of this work is to compare some parameters of the water regime of the Korean pine different climatic types to determine the characteristics of their adaptation to specific environmental factors. Some parameters of the plants’ water regime were studied: retention of water in the needles (by the thermal gravimetric method), intensity of transpiration (by rapid weighing) and RWC (relative water content in the needles). To control environmental factors, the humidity of the root zone of the soil, temperature and air humidity, and wind speed were simultaneously recorded. According to the results of the research, differences in the magnitude of the parameters of the water regime both between individual climatic types and within each of them during different periods of the research season are noted. The greatest differences between climatic types are observed in the first half of summer (June-July), and by September these differences become minimal. There is no direct relationship between the rate of transpiration and the water content in the needles. This suggests that the maintenance of water balance at the proper level is not determined only by the amount of transpiration from the surface of the needles. For a more complete characterization of the water regime of the studied plants groups and the determination of differences in their adaptation to the growing conditions, additional studies are needed. According to the results of the obtained data analysis, the Terneisky and the Sergeyevsky types of the Korean pine have been classified as more adapted to the conditions of insufficient soil moisture. The plants of the Kirovsky and Shumninsky climatic types are less adapted.
