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Light-Temperature Characteristics of Betula pubescens (Betulaceae) Seedlings

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S.N. Drozdov, E.S. Kholoptseva, T.A. Sazonova,

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[58.036:581.08.132]:582.739

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Abstract

Representatives of Betula are one of the main tree species within the Russian Federation, occupying more than half of the total area of deciduous tree species. Due to the fact that birch provides high quality raw material for various sectors of the economy, the first half of the 20th century saw targeted studies of its developmental biology. As of today, however, its cultivation ecology has not been adequately investigated. Therefore, we studied the light-temperature characteristics of two-year birch seedlings under controlled environmental conditions in a complex planned experiment with three levels of soil temperature (15, 20 and 25°C). It was shown that the ecophysiological characteristics of intact plants depend on all of the environmental factors under study. The greatest potential maximum of net photosynthesis in birch seedlings was reached at the soil temperature of 15 °C, air temperature 26.3°C and light 57.3 klx. In addition, the seedlings had wide temperature (20.0–32.5°C) and light (41.3–73.2 klx) ranges of optimum providing 90 % net photosynthesis. The soil temperature raised to 20°C and above leads to lower potential level of apparent photosynthesis and narrower light-temperature optimum at natural CO2 levels in the air. With increased air temperature birch seedlings reach the maximum net photosynthesis at a brighter light.

Authors

S.N. Drozdov, Doctor of Biology, Professor
E.S. Kholoptseva,Candidate of Biology, Senior Researcher
T.A. Sazonova, Doctor of Biology, Leading Researcher

1 Institute of Biology, Karelian Research Centre, Russian Academy of Sciences, Pushkinskaya, 11, Petrozavodsk, Russia, 185910, E-mail: holoptseva@krc.karelia.ru 

2 Forest Research Institute, Karelian Research Centre, Russian Academy of Sciences, Pushkinskaya, 11, 185910, Petrozavodsk, Russia, E-mail: alt86@rambler.ru

Affiliation

1Institute of Biology, Karelian Research Centre, Russian Academy of Sciences,     2Forest Research Institute, Karelian Research Centre, Russian Academy of Sciences

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Light-Temperature Characteristics of Betula pubescens (Betulaceae) Seedlings

 

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