Journal of Siberian Federal University. Biology / Seasonal Sap Flow Dynamics in Larix sibirica Trees Growing in the Krasnoyarsk Forest-Steppe

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Issue
Journal of Siberian Federal University. Biology. 2019 12 (1)
Authors
Benkova, Anna V.; Rubtsov, Alexey V.; Benkova, Vera E.; Shashkin, Alexander V.
Contact information
Benkova, Anna V.: V.N. Sukachev Institute of Forest SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/28 Akademgorogok, Krasnoyarsk, 660036, Russia; ; Rubtsov, Alexey V.: V.N. Sukachev Institute of Forest SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/28 Akademgorogok, Krasnoyarsk, 660036, Russia; Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; Benkova,Vera E.: V.N. Sukachev Institute of Forest SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/28 Akademgorogok, Krasnoyarsk, 660036, Russia; ; Shashkin, Alexander V.: V.N. Sukachev Institute of Forest SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/28 Akademgorogok, Krasnoyarsk, 660036, Russia; Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia
Keywords
sap flow; transpiration; crown conductivity; weather conditions; BS-model
Abstract

Seasonal dynamics of sap flow in the stems of two Siberian larch trees (Larix sibirica Ledeb.) with different radial growth rates were analyzed. The trees grew nearby Pogorelsky Bor research station of Institute of Forest, SB RAS (Krasnoyarsk forest-steppe, 56.36°N, 92.95°E). Intensity of stem sap flow was measured continuously during the vegetation seasons of 2014 and 2015 using the tissue heat balance (THB) method on two individual trees of the same age and height that grew three meters apart and differed in stem diameter (DBH) only. Seasonal dynamics of sap flow intensity of these trees were synchronous (R = 0.77-0.94) within the common vegetation period while the absolute diurnal values differed considerably. The eco-physiological BS-model verified by the data of sap flow measurements allowed to calculate daily and seasonal transpiration dynamics. Seasonal dynamics of sap flow intensity per tree and transpiration per day, and vapor pressure deficit (VPD) as well as seasonal precipitation during the vegetation period were all synchronous. Soil moisture, however, did not show clear correlation with these parameters, thus it may be concluded that it is VPD, but not soil moisture that is the main factor responsible for sap flow intensity in the observed vegetation conditions. The data obtained from the seasons of 2014 and 2015 suggest that continuous automatic measurements of sap flow intensity allow to study phenocycles in trees with various growth rates as well as to determine very precisely the start and the end of their vegetation season

Pages
32-47
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/107074

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