Reconstrucción de precipitación invierno-primavera para el Parque Nacional Pico de Tancítaro, Michoacán

From the water resource perspective, the Tancítaro Peak is the most important hydrologic wealth for the region and a chief element for the economic development. The instrumental records of climate are very short and paleoclimatic studies dealing with rainfall variability are non existent. The objectives of this study were: (1) to reconstruct the variability of precipitation for the Tancítaro Peak based on growth rings of Abies religiosa; (2) to determine important frequencies on climate variability of the region. Using standard dendrochronological techniques 25 samples were accurately dated (p<0.05). Precipitation variability was reconstructed for the last years of XIX century to first decade of XXI century (1884-2010, 127 years). The most severe droughts reconstructed for the western Michoacan state were reconstructed for the periods 1890-1896, 1948-1957, 1968-1971, 1982-1989 and 1998-2010. The period 1960-1966 represents the wettest period of the last 127 years. Severe multi-annual droughts (1891-1896, 1942-1956 y 1998-2010) have recurrence of 42 to 43 years, and are related to a significant frequency (p<0.05) of 42 years.