Resumen

RIOS CARRASCO, E. de los; DE HOOGH, R.  y  NAVAR CHAIDEZ, J. J.. Reforestation trials with pinyon pine species in the northeastern of Mexico. Rev. Chapingo ser. cienc. for. ambient [online]. 2008, vol.14, n.2, pp.97-104. ISSN 2007-4018.

There are numerous degraded areas by overgrazing practices in the interior valleys of the eastern Sierra Madre mountain range of Nuevo Leon, Mexico. Reforestation and plant restoration practices can incorporate tree species adapted to these conditions of degradation as well as to consistent regional drought spells and that they had been previously and successfully tested in other places and above all if these species are listed in any of the red books of the biological conservation. This research work set as objective to test the adaptation of three pinyon pine species (P. cembroides Zucc., P. nelsonii Shaw. y P. pinceana Gord.) 19 years after planted in the slopes of the eastern Sierra Madre mountain range of the state of Nuevo Leon, Mexico. The experimental design employed was a randomized block, with three species, with three replicates, and two locations, characterized by altitude above sea level (1,250 and 1,680 masl). In each quadrat we planted 49 seedlings with a space of 1 x 1 m, with a total for each species and block of 147 seedlings. Basal diameter, top height, and survival were measured every six months during the first three years and a last observation conducted during 2002. The results indicated that P. pinceana developed better in top height and survived better at both sites and performed better when growing in basal diameter at site with the highest altitude. P. cembroides performed better in basal diameter at the site with the lowest altitude. Survival was in general above 50 % at the end of measurements and there are indications that tree mortality by intraspecific competence was already taking place. These results indicate that both P. pinceana and P. cembroides can be widely reforested in the slopes of the eastern Sierra Madre mountain range of the state of Nuevo Leon, Mexico.

Palabras llave : P. pinceana; P. cembroides; P. nelsonii; reforestation; land degradation; northeastern México.

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