POST-FIRE RESPONSE ANALYSIS BASED ON LANDSAT TIME SERIES IN ARAUCARIA-LENGA FORESTS IN SOUTH-CENTRAL CHILE.

Phenological processes such as the appearance or abscission of leaves depend on the environmental conditions in which a plant or plant community develops. Anthropic disturbances such as forest fires can modify these conditions, affecting phenology. Free access satellite information allows the monitoring of vegetation over time. In this work, the phenology of Andean forests of Araucaria araucana (araucaria) associated with Nothofagus pumilio (lenga) from south central Chile was analyzed using NDVI time series with the objective of identifying seasonal changes, trends or abrupt changes related to forest fires that occurred between 1998 and 2021. The results show that the start (SOS) and end of the growing season (EOS) could be related to the fire events. In addition, abrupt changes in the trend component coincident with the fire events were detected. These preliminary results lay a foundation to continue studying the phenological behavior of these forests under different environmental conditions.