Resilience of Pinus durangensis Martínez in Extreme Drought Periods: Vertical and Horizontal Response of Tree Rings

Extreme drought events reduce the productivity of forest ecosystems. One approach for estimating effects on forests is by assessing their resilience. The objective this study was to estimate resilience rates at different heights along tree stem Pinus durangensis Martínez. radial growth 200 cross sections extracted four stems (0.07–0.15, 1.3, 6.3, and 11.0–12.0 m) analyzed subsequently transformed into ring-width indices (RWI). These were correlated with Standardized Precipitation-Evapotranspiration Index a six-month time scale (accumulated six months in period February–May; SPEI06FM). Seven extreme identified (1890, 1902, 1956, 1974, 1999, 2006, 2011), before, during, after each event determined. Based index values, resistance, recovery, calculated. results indicated significant correlation (p ? 0.05) between annual increment climate (0.56 0.80). Climatic sensitivity higher lower part stem, mean (MS) expressed population signal (EPS) values 0.38 0.97, respectively. Resistance ranged from 0.44 0.76 better stem. Resilience changed over time. Regardless height latest (1999, 2011) have led trees, indicating that recovery capacity has decreased. Therefore, forestry practices area may consider managing density as strategy regulate stress competition increase tolerance trees drought.