NDLI: How Wind Affects the Photosynthetic Performance of Trees: Quantified with Chlorophyll a Fluorescence and Open-Top Chambers

Content Provider	Springer Nature Link
Author	Clark, A.J. Landolt, W. Bucher, J.B. Strasser, R.J.
Copyright Year	2001
Abstract	Meteorological parameters inside and outside an open-top chamber (OTC) fumigation facility were recorded and the primary photosynthetic response of four tree species measured with chlorophyll (Chl) a fluorescence emission. Parameters extracted from the Chl a fluorescence transient were used to calculate photosynthetic activity of the leaves using a performance index. Measurements were made during the night throughout a single growing season. The seasonal primary photosynthetic performance in all species was significantly altered by growth in the OTCs, and the degree of response was dependent upon the species. Wind was an important effectual component of the altered environment. The average temperature was consistently 1.94±0.70 °C higher within the OTCs, whereas wind speed fluctuated substantially more between inside and outside the OTCs (0 to 8 m $^{−1}$). There was a correlation between the photosynthetic performance index and wind speed in Fagus sylvatica, Fraxinus excelsior, and Prunus serotina. The response to wind was also particular to each species; the photosynthetic performance of F. sylvatica increased with wind speed (1 to 7 m s$^{−1}$), decreased with F. excelsior (0 to 6.5 m s$^{−1}$) and P. serotina (0 to 5.5 m s$^{−1}$). Abies alba, in contrast, was almost insensitive to wind. A model was proposed and tested for the conversion of the photosynthetic performance values collected in OTCs to predict the photosynthetic performance outside OTCs. The wide variety of responses to wind and temperature of the four species conformed to linear functions that describe the relationship of the wind speed and temperature responses with the difference in photosynthetic performance between the OTC and open environments. Specific coefficients for wind and temperature were proposed. The photosynthetic response to wind of each species depends on its ecophysiological specialisation.
Starting Page	349
Ending Page	360
Page Count	12
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	38
Issue Number	3
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2000-04-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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