Abstract
The complex interactions among environmental factors as incident light, temperature and soil water content create the need for used physiology-based models which describe plants performance under current and changing climatic conditions. In the present work the net photosynthetic rate of Pinus pallasiana D. Don, Juniperus excelsa M.Bieb. and Arbutus andrachne L. was modeled as a function of light irradiance using the modified rectangular hyperbola model, which is capable of describing the photoinhibition by the non-rectangular hyperbola function. A comparative assessment of the adaptive response of the photosynthetic apparatus plants on the effect of abiotic factors and their strategies in maintaining an optimal water balance in accordance with environmental conditions has been performed. The parameters of light curves of photosynthesis under conditions of full sunlight, moderate shading and drought are determined. In relation to light, Pinus pallasiana is characterized by wider ecological amplitude compared to Juniperus excelsa and Arbutus andrachne. Inefficient use of low-intensity of photosynthetically active radiation by immature plants Pinus pallasiana and Juniperus excelsa indicates poor shade tolerance and inability to resume in shade-type forests. Due to the low plasticity to changes in the light regime, Arbutus andrachne L. may experience a significant lack of light in strong shading. Arbutus andrachne has the highest ability to actively rearrange water regime in accordance with its external moisture supply, which causes the highest drought resistance, and Juniperus excelsa has a slightly lower capacity. Tolerance to hydrothermal stress in Pinus pallasiana is significantly lower than in Arbutus andrachne and Juniperus excelsa.
Highlights
Plants in the ecosystems of the southern Russia in areas of insufficient moisture in summer are often subjected to the stress of severe and prolonged drought [1]
The intensity of net photosynthetic rate in this species is on average 11-15% higher than the needles of Pinus pallasiana and Arbutus andrachne leaves
Analysis of the results showed that the optimum environmental conditions, providing higher net assimilation of CO2 of young plants Pinus pallasiana are the needles temperature from 14 to 23°C when the soil moisture at 60-80% Field Capacity (FC) under sunlight treatment at 600-400 μmol photons m-2 s-1 photosynthetically active radiation (PAR)
Summary
Plants in the ecosystems of the southern Russia in areas of insufficient moisture in summer are often subjected to the stress of severe and prolonged drought [1]. The optimal ecological conditions of plant growth are partially determined by their species-specific physiological response to the complex impact of environmental factors [2]. This reaction manifests itself in a coordinated adaptation between hydrothermal stress and lighting, that is, optimization of the processes of life and productivity [7]. Understanding these characteristics gives you the ability to simulate plant response to different climatic conditions
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