Plant Ecology

, Volume 187, Issue 2, pp 179–187 | Cite as

Contrasted Responses of Two Understorey Species to Direct and Indirect Effects of a Canopy Gap

Article

Abstract

Positive associations between adult trees and understorey species have been explained either by direct or indirect facilitation. We tested both models by comparing the performance of two understorey species with contrasted stress-tolerance abilities Galium odoratum and Deschampsia flexuosa. Individuals of both species were transplanted in the four combinations of two treatments (gap and removal of an herbaceous competitor, Molinia caerulea). Our experiment demonstrated that direct facilitation of adult trees may explain the restricted occurrence of the shade-demanding Galium within closed forest communities. In contrast, the shade-tolerant Deschampsia was subjected to additional competition within the forest, likely because adult trees had a higher negative effect on light availability and a similar negative effect on nitrogen availability within the forest than did Molinia in the gaps.

Keywords

Competition intensity Forest communities Indirect effects Light Molinia caerulea Nitrogen 

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Copyright information

© Springer 2006

Authors and Affiliations

  1. 1.CemagrefCampus universitaire Grenoble 1, UR Ecosystémes et Paysages MontagnardsSaint Martin d’HéresFrance
  2. 2.Laboratoire d’Ecologie des CommunautésUMR 1202 BIOGECO INRA-Université Bordeaux 1TalenceFrance

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