Photosynthesis intensity of spruce, pine and oak seedlings under tree canopy and in the open site in different water supply conditions

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Abstract

The studies were conducted in the Serebryany Bor experimental forestry division of the Institute of Forest Science of the Russian Academy of Sciences on 5–7-year-old seedlings of spruce, pine and oak. The average daily dependence of photosynthesis on solar radiation was studied under different water supply conditions. The dependence was aligned using the equation proposed by M. Monsi and T. Saeki and the correlation between photosynthesis intensity and the lack of water supply. The results obtained were as follows: while a spruce under the forest canopy reduces its intensity of photosynthesis to zero at the pre-dawn leaf water potential (PDLP) value of –2.4 MPa, the one in the open will do so at the PDLP value of –1.5 MPa. In case of pine, the decrease of photosynthesis intensity to zero occurs under the forest canopy at the PDLP value of –2.2 MPa, and in the open – at –1.8 MPa. The oak’s water supply requirements under the forest canopy and in the open are practically the same, photosynthesis intensity decreases to zero in both growing conditions at a PVPL equal to –3.5 MPa. However, under the forest canopy, the intensity of oak photosynthesis is three times lower than in the open, while for spruce it is practically the same.

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About the authors

A. G. Molchanov

Institute of Forest Science of the RAS

Author for correspondence.
Email: a.georgievich@gmail.com
Russian Federation, Sovetskaya st. 21, Uspenskoe, Odintsovsky District, Moscow Oblast, 143030

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Supplementary files

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2. Fig. 1. Dependence of the intensity of photosynthesis of pine needles of the current year on solar radiation under the forest canopy under different water supply conditions: A - PVPL = -1.0 MPa; B - PVPL = -1.2 MPa; C - PVPL = -1.5 MPa; D - PVPL = -2.2 MPa. (The circle symbol indicates experimental values; the cross symbol indicates calculated values).

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3. Fig. 2. Diurnal variation in the intensity of photosynthesis (1) and solar radiation (2) of oak in an open place on days with different water supply (PVPL): with variable cloudiness A, D, E, Z and overcast cloudiness B, C, D, G (after: Molchanov, Belyaeva, 2024).

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4. Fig. 3. Diurnal variation in the intensity of photosynthesis (1) and solar radiation (2) of spruce in open areas with different degrees of water supply (PVPL). A, B, D, E – with variable cloudiness, B, D, G – with continuous cloudiness (according to: Molchanov, Belyaeva, 2024).

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5. Fig. 4. Daily course of the intensity of photosynthesis (1) and solar radiation (2) of a pine seedling on days with different water availability (VWSI): A, B, D, G – with variable cloudiness, B, D, E, Z – with continuous cloudiness (according to: Molchanov, Belyaeva, 2024).

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6. Fig. 5. Dependence of the average daily intensity of photosynthesis on water availability (ADIP) for seedlings growing under the canopy of a tree stand: A – spruce, B – pine, D – oak, dependence of the average daily intensity of photosynthesis on water availability (ADIP) for seedlings growing in the open: B – spruce, G – pine, E – oak.

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7. Fig. 6. Daily variation of solar radiation and photosynthesis of pine when watering was performed at 13:00 after a 5-day period with insufficient water supply, ADIP is –1.6 MPa; after watering, ADIP is 0.4 MPa.

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