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Land use and climate influences on fire regimes within Pinus greggii Engelm. var. greggii forest stands in the Sierra de Zapalinamé, Coahuila, Mexico

A. H. Velazquez-Perez,V. J. Reyes-Hernández,A. Gómez‐Guerrero,J. Villanueva‐Díaz,Jose M. Iniguez

Published 2025 in Botan‪ical Sciences

ABSTRACT

Background: Understanding fire regimes is important for developing conservation strategies for drought-tolerant species with serotine cones; although, no fire-frequency studies have been undertaken in Pinus greggii a serotine species. Hypotheses: Fire occurrence in Pinus greggii stands are related to climatic conditions prior to and during the fire year, but fire regimes have changed in the last two decades induced by anthropogenic disturbances changing the fire regime. Studied species: Pinus greggii Engelm. Descriptive statistics of the fire regime. Superposed Epoch Analysis. Study site and dates: El Penitente, Cañón de las Norias, Cañón del Negro, in the municipalities of Arteaga and Saltillo, Coahuila. Year 2019. Methods: Samples from 99 fire-scarred trees at three sites in the Sierra de Zapalinamé Coahuila were collected and dated using dendrochronological techniques. Results: The fire regime was analyzed from 1840 to 2014. Most fires occurred in spring, except in CNO, where fires occurred in summer. The average fire interval for the three sites was 4-7 years with small fires, more extensive fires were less frequent (8-15 years). The occurrence of fires in TVE was significantly associated with indices of the Southern Oscillation (SOI). Fire frequencies have changed in recent decades, due to land-use changes at CNO and CNE, but not at TVE, the most isolated site with least human disturbance. Conclusions: The fire regime in populations of Pinus greggii was associated with natural climate variability and sites with greater human influence showed no significant association with climate.

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