Abstract

ROBLES VILLANUEVA, Fernando; RODRIGUEZ TREJO, Dante Arturo  and  VILLANUEVA MORALES, Antonio. Plant quality and survival in Pinus montezumae Lamb. reforestation. Rev. mex. de cienc. forestales [online]. 2017, vol.8, n.42, pp.55-76. ISSN 2007-1132.

Plant quality of Pinus montezumae was evaluated in a nursery, laboratory and plantation experiment. The trees were produced in a forest nursery in Tetela del Volcán, Morelos state. Plant quality indicators were measured in a sample. The plantation was made in the foothills of the Popocatépetl volcano. Plots were established at 3 260 masl and 3 170 masl of the reforested ridges, on northern and southern exposures, with three replicates for each factor combination, with a total of 12. Each plot had a planting frame of 7 × 7, to evaluate the central part (25 specimens) and avoid the border effect. Planting density was 1 200 ha-1. At 22 months after established, height, diameter, apparent state and their condition of live or dead plant were registered. An analysis of variance was applied to the response variables measured in the field. The results indicate differences in survival by exposure (P = 0.0222), with the north (88.6 %) surpassing the south (83.3 %). The quality indicators obtained are predictors of survival. The mean and minimum values (maximum in the case of the dry aerial weight / root dry weight ratio and the slenderness coefficient) were 13.6 and 5 mm for the diameter; 3.0 and 5.2 for the dry aerial weight / root dry weight ratio; 1.2 and 3.9 for the coefficient of slenderness; 4.7 and 1.5 for the Dickson index and 55 and 29 for new roots in the root potential growth test

Keywords : Plant quality; exposure; Pinus montezumae Lamb.; plantation; restoration; Tetela del Volcán.