PAGÈS, J.P.; MICHALET, R.

doi:10.1007/s11258-005-0976-x

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PAGÈS, J.P.
Ecosystèmes montagnards [UR EMGR]

MICHALET, R.
Biodiversité, Gènes et Ecosystèmes [BioGeCo]

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Plant Ecology. 2006, vol. 187, n° 2, p. 179-187

Springer Verlag

Resumen en inglés

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.< Leer menos

Palabras clave

NITROGEN

Palabras clave en inglés

COMPETITION INTENSITY

FOREST COMMUNITIES

INDIRECT EFFECTS

LIGHT

Palabras clave en italiano

MOLINIA CAERULEA