Dependency between photosynthetic intensity of pinus nigra subsp.”Pallasiana”and environmental factors and their change during vegetation under conditions of the southern coast of the Crimea

DOI

10.2991/ispc-19.2019.46How to use a DOI?

Keywords

Pinus nigra subsp. pallasiana, net photosynthetic rate, temperature and light optima, ecological and physiological characteristics

Abstract

The dependence of the net photosynthetic rate of Pinus nigra subsp. pallasiana on environmental factors, leaf temperature, transpiration and their change during the growing season were investigated under the conditions of the Southern Coast of the Crimea. The mapping of the response function of photosynthesis to environmental factors allowed for Pinus nigra subsp. pallasiana to obtain the numerical coefficients of nonlinear regression equations (models) of the relationship of the magnitude of net photosynthetic rate with the main environmental factors. The data obtained make it possible to interpret the rate of photosynthesis as a potential ecological and physiological characteristic of this species, which allows us to compare different types of plants growing under similar conditions, according to indicators measured using the same technique. Pinus nigra subsp. pallasiana has a high potential for photosynthesis to acclimatize to high temperatures. When the air temperature is above the optimum, the intensity of photosynthesis drops sharply. The critical temperature for the leaf is 38 degrees Celsius. After the termination of the period of active growth for June – October, the maximum value of net photosynthetic rate decreased by 15.4 percent, transpiration intensity – by 44.5 percent, leaf temperature – by 6.7 percent. At the same time, in comparison with June in October, the temperature-light optima shifted downward: air temperature by 21.5 percent, vapor pressure deficit by 40 percent and PAR by 23.1 percent.

Copyright

© 2019, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Oleg Ilnitsky
AU  - Andrey Pashtetsky
AU  - Yuri Plugatar
PY  - 2019/06
DA  - 2019/06
TI  - Dependency between photosynthetic intensity of pinus nigra subsp.”Pallasiana”and environmental factors and their change during vegetation under conditions of the southern coast of the Crimea
BT  - Proceedings of the International Scientific and Practical Conference “Digital agriculture - development strategy” (ISPC 2019)
PB  - Atlantis Press
SP  - 205
EP  - 209
SN  - 1951-6851
UR  - https://doi.org/10.2991/ispc-19.2019.46
DO  - 10.2991/ispc-19.2019.46
ID  - Ilnitsky2019/06
ER  -