Drought responsiveness in two Mexican conifer species forming young stands at high elevations

Aim of study: To determine the response high-altitudinal forests to seasonal drought.Area Monte Tláloc, Estado de México and Rancho Joyas del Durazno, Municipality Río Verde, San Luis Potosí, México.Materials methods: In this study, we evaluate drought hydroclimate in two young Mexican conifers sampled at high elevation, correlating records tree-ring growth Normalized Difference Vegetation Index (NDVI).Main results: The results show that Pinus teocote Abies religiosa are vulnerable precipitation regime warm conditions winter-spring. physiological mechanisms seem be differentiated between species, according effects stress. NDVI demonstrated different temporal responses species their inherent hydroclimatic limitations. This differentiation can attributed spatial variation present particular physical geographic each area. dry climates reveal P. A. conditions. However, further evaluation resistance resilience these is necessary, as well disentanglement associated influence predicted processes extinction or migration.Research highlights: These importance given climatic scenarios for elevated ecotones. Tree-ring widths improved radial climate, enhancing our understanding forest dynamics. variability depends on species.Keywords: High elevation; tree-ring; ENSO; NDVI; climate-growth relationship. Abbreviations used: (NDVI); Tree-Ring Width (TRw); (PP); maximum temperature (Tmax); minimum (Tmin); El Niño-Southern Oscillation (ENSO); Climatic Research Unit Time-series data version 4.04 (CRU TS v. 4.04); Standardized Precipitation-Evapotranspiration (SPEI); 4.03 4.03); first-order autocorrelation (AC); mean sensitivity (MS); correlation trees (Rbt); expressed population signal (EPS); Ring (RWI).