Photosynthetic Pigments in Siberian Pine and Fir under ClimateWarming and Shift of the Timberline
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DOI:
10.3390/f11010063URI (для ссылок/цитирований):
https://www.mdpi.com/1999-4907/11/1/63https://elib.sfu-kras.ru/handle/2311/143163
Автор:
Pakharkova, N. V.
Borisova, I. V.
Sharafutdinov, R. A.
Gavrikov, V. L.
Коллективный автор:
Институт экологии и географии
Кафедра экологии и природопользования
Дата:
2020-01Журнал:
ForestsКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q1Библиографическое описание:
Pakharkova, N. V. Photosynthetic Pigments in Siberian Pine and Fir under ClimateWarming and Shift of the Timberline [Текст] / N. V. Pakharkova, I. V. Borisova, R. A. Sharafutdinov, V. L. Gavrikov // Forests. — 2020. — Т. 11 (№ 1). — С. 63Аннотация:
Research Highlights: For the first time, the Pinus sibirica Du Tour and Abies sibirica L. conifer
forest at theWest Sayan ridge timberline has been explored to reveal which species is likely to react to
climate change and a shift of the timberline. Such a shift may modify the ecological functions of the
forests. Background and Objectives: Long-term climate change has become obvious in the mountains of
southern Siberia. Specifically, a half-century rise in annual mean temperatures has been observed,
while precipitation remains unchanged. Trees growing at the timberline are likely to strongly react
to climate alterations. The objective was to estimate which of the two species sharing the same
habitat would benefit from climate alteration and shifting of the timberline. Materials and Methods: At
several altitudes (from 1413 to 1724 m a.s.l.), samples of P. sibirica and A. sibirica needles have been
collected and contents of chlorophyll a and b as well as carotenoids were measured in June 2019. The
temperature of needles of the two species was measured in both cloudy and sunny weather conditions.
Results: The studied species have been shown to have di erent patterns of pigment variations with
the growth of altitude. The decline of chlorophylls and carotenoids was more pronounced in P. sibirica
(ratio at timberline ca. 2.2) than in A. sibirica (ratio ca. 3.1). Accordingly, the electron transport rate
decreased more strongly in P. sibirica at the timberline (ca. 37.2 mol of electrons/m2 s1) than in
A. sibirica (56.9 mol of electrons/m2 s1). The temperatures of needles in both cloudy and sunny
weather were higher in A. sibirica (10.5 and 43.3 C, respectively) than in P. sibirica (3.8 and 24.2 C,
respectively). Conclusions: The considered physiological and ecological traits show that P. sibirica
is better protected from higher-altitude hazards (excess insolation, rise of temperature etc.) than
A. sibirica. P. sibirica may be therefore a more likely winner than A. sibirica in the movement of the
mountain timberline under climate warming in the area.