Light interception in experimental forests affected by tree diversity and structural complexity of dominant canopy

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http://hdl.handle.net/10138/308557

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Rissanen , K , Martin-Guay , M-O , Riopel-Bouvier , A-S & Paquette , A 2019 , ' Light interception in experimental forests affected by tree diversity and structural complexity of dominant canopy ' , Agricultural and Forest Meteorology , vol. 278 , 107655 . https://doi.org/10.1016/j.agrformet.2019.107655

Title: Light interception in experimental forests affected by tree diversity and structural complexity of dominant canopy
Author: Rissanen, Kaisa; Martin-Guay, Marc-Olivier; Riopel-Bouvier, Anne-Sophie; Paquette, Alain
Contributor: University of Helsinki, Ecosystem processes (INAR Forest Sciences)
Date: 2019-11-15
Language: eng
Number of pages: 9
Belongs to series: Agricultural and Forest Meteorology
ISSN: 0168-1923
URI: http://hdl.handle.net/10138/308557
Abstract: Biodiversity affects ecosystem functioning in forests by, for example, enhancing growth and altering the forest structure towards greater complexity with cascading effects on other processes and trophic levels. Complexity in forest canopy could enhance light interception and form a link between diversity and productivity in polyculture forests, but the effect of canopy structure on light interception is rarely directly measured. We modelled the canopy surface structure of a tree diversity experiment by photographing it using unmanned aerial vehicle (UAV) and combining the photos into a digital elevation model with photogrammetry tools. We analysed the effects of tree diversity and functional diversity on canopy structural complexity and light interception with a structural equation model. Our results show that: a) increased structural complexity of the canopy reduces light interception, whereas b) tree diversity increases the structural complexity of the canopy, and has a dual impact on light interception. Tree diversity decreased light interception through the structural complexity of the canopy but increased it probably through canopy packing and crown complementarity. However, the effects of both tree diversity and structural complexity of canopy were smaller than the effect of the functional identities of the tree species, especially the differences between deciduous and evergreen trees. We conclude that more complexity in canopy structure can be gained through increased tree diversity, but complex canopy structure does not increase light interception in young forests.
Subject: 4112 Forestry
BIODIVERSITY
Biodiversity
CARBON STORAGE
CROWN PLASTICITY
Canopy structure
Ecosystem functioning
FUNCTIONAL DIVERSITY
Functional diversity
HETEROGENEITY
Light interception
PRODUCTIVITY
Photogrammetry
STANDS
UAV
UNDERSTORY LIGHT
UNMANNED AERIAL VEHICLES
VEGETATION
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