INFIVE   05416
INSTITUTO DE FISIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Identifying abiotic stresses during seedling establishment in rainforest restoration
Autor/es:
PINAZO MARTIN A.; MORETTI ANA P.; GRACIANO CORINA; OLGUIN FLAVIA Y.
Lugar:
Bariloche
Reunión:
Conferencia; International Conference ?Adapting forests ecosystems and wood products to biotic and abiotic stress. Integrating tools, methods and disciplines to face global change; 2019
Institución organizadora:
LIA Forestia
Resumen:
The remaining Atlantic Rainforest in Argentina have lost richness and structure by the over extraction of selective valuable trees. Plantation of seedlings can speed up the restoration of degraded rainforests. However, the success of plantations in multistratum forests is frequently low. One reason is the high variability of microenvironments in the understory that expose seedling to different abiotic stresses like deficit or excess of light, together with water deficit. The other reason is that the capacity of the native tree species to acclimate to those environments is unknown. In general, an ecological classification of the species is assumed but there are no evaluations of their tolerance to different stresses. We evaluated the acclimation of two species exposed to full sun and under a dense protecting canopy. We compared a sun demanding (araucaria) with an intermediate succession species (cancharana). Morpho-physiological responses of plants indicate that the main abiotic stress under full sun is water deficit, because plants adjusted mainly hydraulic traits. Plasticity of cancharana was higher than araucaria. Acclimation in leaf area and chlorophyll concentration was in the opposite direction in both species. After that, we assessed the acclimation of the seedlings to different microenvironments, given by different positions within gaps in the rainforest. Under the close canopy stress by deficit of light was severe and halted growth and increased mortality. In the center of the gaps, stresses by water deficit and excess of light were mild and both species grew more in microenvironments with more incident radiation. These results give important tools to underpin restoration strategies in tropical and suptropical rainforests.