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How is light interception efficiency related to shoot structure in tall canopy species?
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Journal Article
How is light interception efficiency related to shoot structure in tall canopy species?
2017
Overview
Coexistence of multiple species is a fundamental aspect of plant and forest ecology. Although spatial arrangement of leaves within crowns is an important determinant of light interception and productivity, shoot structure varies considerably among coexisting canopy species. We investigated the relative importance of structural traits in determining the light availability of leaves (I) and light interception efficiency at the current-year shoot level (LIECS; the total light interception of leaves divided by shoot biomass) at the top of crowns of 11 canopy species in a cool-temperate forest in Japan. In accordance with Corner’s rules, the total mass, stem mass, total mass of leaf laminae, individual leaf area, and stem cross-sectional area of current-year shoot were positively correlated with each other, and branching intensity (the number of current-year shoots per branch unit of 1-m length) was inversely correlated with these traits across species. In contrast, I was correlated not with these traits, but with leaf elevation angle (a
L). Moreover, variation in LIECS across species was caused by variation in I (thus in a
L). Thus, a
L is a key parameter for the leaf light interception of canopy shoots in this cool-temperate forest. Differences in a
L across species might be related to different physiological strategies that developed in the high light and water-limited environment of forest canopies. Small variation in the length of current-year shoots among species implies that variations in I and LIECS would be important for the coexistence of these canopy species.
