Two adjoining stands were selected, with altitude intervals between 2 4000 and 2 555 masl and differing mainly in their predominant topoforms: intermountain valleys, lowlands and hillsides with mild and medium slopes in stand 1, and mountainsides with medium to steep slopes in stand 2 Figure 1.
Se seleccionaron dos rodales contiguos, con intervalos de altitud entre 2 400 y 2 500 m, que difieren, principalmente, en las topoformas predominantes: valles intermontanos, bajíos y laderas con pendientes suaves a medias en el rodal 1, y laderas con pendientes medias a fuertes en el rodal 2 Figura 1.