Chile's native forests are of great ecological value on a global scale, because of the high number of endemic species (e.g. Araucaria araucana). Forest fires destroy about 0,1% of the native forests each year, reducing the vegetation diversity, ecosystem stability, and effecting on the quality and quantity of the hydrological parameters of the water drained from these watersheds. The project aims to evaluate the regeneration capacity of the vegetation, to quantify the capacity for N mineralisation - immobilisation, and to obtain information on the quantity and quality of water drained from A. araucana ecosystems, which were and were not affected by fire.