Abstract
Key message
Outplanted Polylepis australis seedling growth, survival and mycorrhizal response were not influenced by inoculation with soil from different vegetation types. Seedling inoculation would not be essential for reforestation practices.
Abstract
Polylepis forests are one of the most endangered high mountain ecosystems of South America and reforestation with native Polylepis species has been recommended. To determine whether native soil inoculation could help in reforestation success, a field trial was set up to evaluate the response of outplanted P. australis seedlings to the inoculation with soils from three vegetation types (a grassland, a mature forest and a degraded forest) and a sterile soil, used as control. We evaluated seedlings performance: growth and survival for 18 months, root/shoot ratio, phosphorous content and arbuscular mycorrhizal fungal (AMF) colonization. To interpret performance patterns we evaluated the colonization potential of the three inoculum soils and the changes of the AMF community composition of the seedlings rhizosphere in relation to inoculation treatment and season. Our main results showed no significant differences in seedlings survival and growth between treatments. The colonization potential of grassland and degraded forest soils was ~25 times greater than mature forest soil and specific spore density of some morphospecies varied with season. However, AMF spore community of seedlings rhizosphere became homogenized after outplanting and was similar between treatments after 12 months. Therefore, we conclude that soil inoculation is not essential for outplanted P. australis survival and increase in height, and thus all the tested soils could be used as inocula, including grassland soils which in practice are the easiest to collect.
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Acknowledgments
This work was financially supported by Agencia de Promoción Científica y Tecnológica––PICT 438-2008, Consejo Nacional de Investigaciones Científicas y Técnicas––PIP 0269 and Secretaría de Ciencia y Técnica de la Universidad Nacional de Córdoba (SECyT-UNC). F.S. is grateful to CONICET for providing her fellowship. A.B. and D.R. are researchers of CONICET. We thank to the Quebrada del Condorito National Park authorities that generously allowed the use of the lands for the reforestation assay. This research would not have been possible without numerous volunteers (especially Barberá I., Berizzo A., Bernaschini M.L., Domínguez J., Farias G., Flores S., Galli E., Gatica L., Peralta G., Street E., and researchers and PhD students of the Laboratorio de Micología-IMBIV-) who provided exceptional field assistance.
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Soteras, F., Renison, D. & Becerra, A.G. Restoration of high altitude forests in an area affected by a wildfire: Polylepis australis Bitt. seedlings performance after soil inoculation. Trees 28, 173–182 (2014). https://doi.org/10.1007/s00468-013-0940-7
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DOI: https://doi.org/10.1007/s00468-013-0940-7