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Silva Lusitana

versão impressa ISSN 0870-6352

Silva Lus. v.9 n.2 Lisboa dez. 2001

 

Seedlings Performance of Two Conifer Species in Disturbed Alpine Areas in Central Mexico

 

Raúl Salas-González1 * and Miguel Franco**

* Assistant Professor

Escola Superior Agrária de Coimbra, 03040 Bencanta, COIMBRA

** Researcher

Instituto de Ecologia, UNAM, 04510 MÉXICO

 

 

Abstract. Growth performance and survival was evaluated for Pinus ayacahuite and Pinus rudis on three disturbed areas in the volcano Ajusco. The pines species were planted in all three areas, including the fir-pine forest. In 1994 and 1998 measurements of the growth and survival were made in 3 000 seedlings in 50 plots of 400 m2 each. Comparison of growth and survival of Pinus rudis and Pinus ayacahuite indicated that a large proportion of the variation in these traits was accounted for type of locality, which in turn is a function of the microclimate variation provide by the slope exposures. The lowest values of growth and survival were found in pine forest, which, in comparison to pine-fir forest, is located at higher elevations and unprotected from winter dry winds and frost. The results showed that microclimatic variation has a profound effect in the performance of each species. This study shows the importance of carrying out a careful assessment of the revegetation practices in the region.

Key words: artificial regeneration; Pinus ayacahuite; Pinus rudis; disturbed forest regeneration

 

 

Sumário. Foi realizado um estudo para avaliar o sucesso de duas espécies de resinosas (Pinus ayacahuite e Pinus rudis) que foram plantadas em três áreas degradadas do vulcão Ajusco. Em 1994 e 1998 instalaram-se 50 parcelas de amostragem, em cada uma das amostragens 3000 árvores foram avaliadas em termos de crescimento e de sobrevivência. Os resultados do estudo revelam que o tipo de localidade é determinante no comportamento do crescimento e da sobrevivência destas espécies. Assim também foi relevante salientar a necessidade de avaliar as práticas de repovoamento nestas áreas degradadas afim de recomendar os tipos de espécies mais adequadas.

Palavras-chave: regeneração artificial; Pinus ayacahuite; Pinus rudis; regeneração em áreas degradadas

 

 

Résumé. Une étude a été menée afin d'evaluer le succès d'un reboisement en tenant compte de la croissance et de la survie de deux espèces: Pinus ayacahuite et Pinus rudis, plantées dans trois localités perturbées du volcan Ajusco. En 1994 et 1998 ont éte réalisées des mesures de la croissance et de la survie sur 3000 jeunes plantes provenant de 50 placettes de 400 m2. La comparaison des résultats de cette étude permet de voir que la variation de la croissance et de la survie est liée au type de localité. Cette étude révèle aussi l'importance d'évaluer les travaux de reboisement afin de recommender les meilleurs espèces à utiliser dans la région.

Mots clés: régénération artificielle; Pinus ayacahuite; Pinus rudis; regénération de la forêt perturbée

 

 

Texto completo disponível apenas em PDF.

Full text only available in PDF format.

 

 

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Submetido da publicação em Julho de 2001

Aceite para publicação em Outubro de 2001

 

1Corresponding author E-mail: rsalas@mail.esac.pt