Purpose:

To evaluate tree-vigor and the natural regeneration of the sacred fir in the eastern part of the State of Mexico (México) considering topographic and forest variables.

Methodology:

Systematic sampling was applied with sites every 100 m a. s. l. between 2900 and 3600 m a. s. l. Through the SAS program the following were conducted: statistical tests of normality, frequency tables and analysis of variance tests to study the relationship between altitude and the vigor and regeneration of Abies religiosa (Kunth) Schltdl. et Cham.

Results:

There is a relationship between altitude and vigor and tree-density. Regeneration is null in low altitudes and it increases with altitude peaking at 3 400 m a. s. l., without great reduction at higher levels. Tree-density in stratum A (DBH ≥12.5 cm) and B (DBH <12.5 cm and >1 m height) increases with altitude; higher tree-densities were recorded at 3 400 m a. s. l.

Limitations:

Research is required on other factors involved in the distribution of the studied species.

Findings:

Regeneration is more successful in mid and high areas, and tree vigor tends to be better there also. It is evidenced that the sacred fir migrates to higher areas because of global warming.

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