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Plant Biol (Stuttg) 2002; 4(4): 503-507
DOI: 10.1055/s-2002-34126
Original Paper
Georg Thieme Verlag Stuttgart ·New York

Seasonal Direct Light Availability Affects Mean Leaf Orientation in a Herbaceous Multi-Species Canopy

K. Zobel, L. Eek
  • Department of Botany and Ecology, Tartu University, Tartu, Estonia
Further Information

Publication History

Received: January 12, 2001

Accepted: April 29, 2002

Publication Date:
18 September 2002 (online)

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Abstract

Relationship between leaf orientation in natural or semi-natural herbaceous communities and the local abundance of direct light has rarely been investigated. We present evidence from a permanent plot experiment that seasonal direct light availability in 40 × 40 cm plots significantly affects mean leaf orientation in a semi-natural wooded meadow. In sunny years and in well-illuminated conditions, the leaf surface is exposed predominantly to the north, and vice versa. Two groups of species are responsible for such a response: of the variation in leaf orientation, 41 % is explainable through direct light availability for light-demanding species, and 26 % for graminoid species. In shade-tolerant species and in forbs there is no sign of a regression between leaf orientation and direct light abundance. Ability to plastically react to variation in seasonal and local direct light availability appears to be a trait under considerable selective pressure only in light-demanding plants, and more characteristic of species with graminoid growth form.

Key words

Grassland - direct light availability - leaf orientation - herbaceous canopy

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K. Zobel

Department of Botany and Ecology
Tartu University

40 Lai St.
51005 Tartu
Estonia

Email: kzobel@ut.ee

Section Editor: R. Aerts