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1 April 2005 Canopy vs. soil effects of shrubs facilitating tree seedlings in Mediterranean montane ecosystems
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Question: Is the facilitative effect of nurse shrubs on early recruitment of trees mediated by a ‘canopy effect’ (microclimate amelioration and protection from herbivores), a ‘soil effect’ (modification of soil properties), or both?

Location: Two successional montane shrublands at the Sierra Nevada Protected Area, SE Spain.

Method: Seedlings of Quercus and Pinus species were planted in four experimental treatments: (1) under shrubs; (2) in open interspaces without vegetation; (3) under shrubs where the canopies were removed; (4) in open interspaces but covering seedlings with branches, mimicking a shrub canopy.

Results: Both effects benefited seedling performance. However, microclimatic amelioration due to canopy shading had the strongest effect, which was particularly pronounced in the drier site. Below-ground, shrubs did not modify soil physical characteristics, organic matter, total N and P, or water content, but significantly increased available K, which has been shown to improve seedling water-use efficiency under drought conditions.

Conclusions: We propose that in Mediterranean montane ecosystems, characterised by a severe summer drought, pioneer shrubs represent a major safe site for tree early recruitment during secondary succession, improving seedling survival during summer by the modification of both the above- and below-ground environment.

Nomenclature: Castroviejo et al. (1986–2001) for Quercus and Pinus species, and Molero-Mesa et al. (1992) for shrub species.

Lorena Gómez-Aparicio, Jose M. Gómez, Regino Zamora, and Janis L. Boettinger "Canopy vs. soil effects of shrubs facilitating tree seedlings in Mediterranean montane ecosystems," Journal of Vegetation Science 16(2), 191-198, (1 April 2005).[0191:CVSEOS]2.0.CO;2
Received: 17 September 2004; Accepted: 7 February 2005; Published: 1 April 2005

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