Effects of artificial shade on early performance of white spruce seedlings planted on clearcuts |
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| Authors: | Rongzhou Man Ken J Greenway |
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| Institution: | (1) OMNR, Ontario Forest Research Institute, 1235 Queen St. E, Sault Ste. Marie, ON, P6A 2E5, Canada;(2) Alberta Sustainable Resource Development, 9920–108th Street, Edmonton, AB, T5K 2M4, Canada |
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| Abstract: | Chlorophyll fluorescence, chlorophyll content, growth, and mortality of white spruce (Picea glauca Moench] Voss) seedlings were monitored for 2 years after planting under three scenarios of artificial shade: no-shade (control),
shade in summer only, and shade all year. The shade frames allowed 50–60% light transmission, with limited effects on air
temperature, relative humidity, soil temperature, and soil moisture around seedlings. Based on fluorescence yield and chlorophyll
content measurements, summer-only shade reduced photoinhibition and photooxidation, especially in summer and fall; extending
to all year shading did not further reduce either photoinhibition or photooxidation. Shade tended to reduce seedling diameter
and mortality, but after 2 years the cumulative effect on mortality was not statistically significant. Study results support
the establishment of white spruce seedlings under partial forest canopy, especially on sites with harsh environmental conditions. |
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