EVALUACIÓN DE LA REGENERACIÓN EN BOSQUE DE PINO MEDIANTE EL METODO "PARCELA CERO"

Abstract

Forest composition, quality, and continuity depend on its regeneration. Early stages of pine were assessed on 315 sample plots, within 74 forest stands yielded from 1991 to 1996 under the parental trees treatment. This study was carried out from 1999 to 2001 in Tapalpa, state of Jalisco, based upon the distance method known as "zero plot". This  method  requires classifying  density into the following classes: overstocked, excessive, suggested, sufficient, and understocked, considering also the distance among trees (< 1, 1 to 2, 2 to 3, 3 to 4, > 4 m) corresponds to the classed density expressed as number  of trees per  m2 (> 1.0, 0.2501 to 1.0, 0.1111 to 0.2500, 0.0625 to 0.111O, < 0.0625). In each sample plot the number of trees is counted and classified by their  health and vigor, 54 per cent showed good density and 46 per cent, understocked density. The spatial distribution was evaluated with use of a "zero plot" diagram and classed Cox index (> 1.18, 0.88 to 1.17, 0.15 to 0.87, < 0.15), in this way its dispersion was clustered (68 per cent), regular (8 per cent), sparse (11 per cent) and rejected (13 per cent). Forest regeneration tends to be abundant in sorne sample plots and rare in others, but is necessary to use a respective index to each natural and artificial (square in this case) distribution form.