University Of Tehran Press Pollution 2383-451X 10 4 2024 09 01 Deciphering Environmental History through Alder Rings: Dendroclimatological Exploration 1162 1175 98327 10.22059/poll.2024.374564.2316 EN Alejandro Félix Taquire Arroyo Escuela Profesional de Ingenieria Ambiental y Forestal, Universidad Nacional de Juliaca, Av. Nueva Zelandia N° 631 Urb. La Capilla –Juliaca, Peru 0000-0001-6552-5228 Nora Haydee Quispe Bellido Escuela Profesional de Ingenieria Ambiental y Forestal, Universidad Nacional de Juliaca, Av. Nueva Zelandia N° 631 Urb. La Capilla –Juliaca, Peru 0000-0001-5833-161X Ebed David Paredes Rodríguez Escuela Profesional de Ingeniería Ambiental y Forestal, Universidad Nacional de Juliaca, Av. Nueva Zelandia N° 631 Urb. La Capilla –Juliaca, Perú 0000-0002-3119-6486 Katia Elizabeth Andrade Linarez Escuela Profesional de Ingenieria Ambiental y Forestal, Universidad Nacional de Juliaca, Av. Nueva Zelandia N° 631 Urb. La Capilla –Juliaca, Peru 0000-0002-6301-4528 Eusebio German Peralta Julliri Universidad Nacional de San Agustín de Arequipa 0000-0002-8444-4949 Jesus Esteban Castillo Machaca Escuela Profesional de Ingeniería Sanitaria y Ambiental, Universidad Andina Nestor Caceres Velázquez de Juliaca, Urbanización Taparachi Km 4.5 salida, Juliaca, Peru 0000-0003-4595-7589 Yesica Magnolia Mamani Arpasi Escuela Profesional de Ingenieria Ambiental y Forestal, Universidad Nacional de Juliaca, Av. Nueva Zelandia N° 631 Urb. La Capilla –Juliaca, Peru Journal Article 2024 04 01 Tree rings in high mountain forests represent a valuable natural archive for climate reconstructions and understanding the impact of climate change on forest ecosystems. In this context, the dendroclimatic potential of Alnus acuminata (alder) was evaluated by selecting 25 trees from seven localities in the Mantaro Valley. Computational programs such as Image-Pro Plus, COFECHA, ARSTAN, Sigma Plot, and the IAWA Standard List were utilized. Densitometry, performed with the QTRS-01X equipment using X-ray technology, provided ring width and apparent density diagrams. Seven chronological periods were identified, covering a span of 37.5 years, with the years 1960-1966, 1972-1978, and 2004-2010 showing the greatest growth, and the years 1966-1970, 1980-1986, and 1999-2005 showing the least growth. Furthermore, the alder exhibited particular sensitivity to low winter temperatures in the higher altitude sampling areas. Samples from Colpar 12-A* and Paca 10-A* showed wall thicknesses of 4.39 and 4.60 µm, respectively, attributable to low temperatures. Additionally, a significant negative correlation was observed between minimum temperature and ring width index (r= -0.38, p<0.005) from 1972 to 2008. In terms of precipitation and ring width index, a positive correlation (r= 0.26, p<0.005) was evidenced from 1949 to 2009, positively influencing its development. These findings underscore the dendroclimatic potential of the species, contributing to the understanding of climatic history and the prediction of future conditions in development areas. https://jpoll.ut.ac.ir/article_98327_ba8d9dd35268014c09031a8c587cf84e.pdf