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.

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

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References

ACKZELL, L., 1993. A comparison of planting, sowing and natural regeneration for Pinus sylvestris (L.) in boreal Sweden. For. Ecol. Manage. 61 : 229-245.        [ Links ]

ASTHON, P.M.S., GAMAGER, S., GUNATILLEKE, I.U.A.N., GUNATILLEKE, C.V.S., 1997. Restoration of a Sri Lanka rainforest: using Caribbean pine Pinus caribaea as a nurse for establishing late successional tree species. J. Appl. Ecol. 34 : 915-925.        [ Links ]

CHAUDRAY, S., SINGH, S.P., SINGH J.S., 1996. Performance of seedlings of various life forms on landslide-damaged forest sites in central Himalaya. J. Appl. Ecol.33 : 109-117.        [ Links ]

DEL RIO, F. (1962) en: MADRIGAL, S.X., 1967. Contribución al conocimiento de los bosques de oyamel (A. religiosa) en el Valle de México. INIF-SARH. Bol. Técn. 18 : 94 pp.        [ Links ]

GARCÍA, E., 1978. Los climas del Valle de México según el sistema de clasificación de Köeppen, modificado por la autora. Colegio de Posgraduados, Chapingo, México., 63 pp.        [ Links ]

GARTOKI, S.C., SINGH, S.P., 1995. Forest floor mass, litterfall and nutrient return in Central Himalayan high altitude forests. Vegetatio 120 : 33-48.        [ Links ]

HAASE, D.L., ROSE, R., 1993. Soil moisture stress induces transplant shock in stored and unstored 2+0 douglas fir seedlings of varying root volumes. For. Sci. 39(2) : 275-294.        [ Links ]

HUANG, S., TITUS, S.J., WIENS, D.G. 1992. Comparison of non-linear height-diameter functions for major Alberta tree species. Can. J. For. Res. 22 : 1297-1304.        [ Links ]

HUSCH, B., MILLER, Ch. I., BEERS, T.W., 1982. Forest mensuration. John Wiley and Sons., 97-113 pp.        [ Links ]

KOZLOWSKI, T.T., PALLARDY, S.G., 1997. The physiological ecology of woody plants. "Academic Press, San Diego".        [ Links ]

KOZLOWSKI, T.T., KRAMER, P.J., PALLARDY, S.G., 1991. The physiological ecology of woody plants. "Academic Press, San Diego".        [ Links ]

LANDA, R., MEAVE, J., CARABIAS, J., 1997. Environmental deterioration in rural Mexico: an examination of the concept. Ecol. Appl. 7(1) : 316-329.        [ Links ]

LARSON, M.M., 1967. Effects of temperature on control, development of Ponderosa pine seedlings from tree sources. For. Sci. 13 : 286-294.        [ Links ]

LINHART, Y.B. 1995. Restoration, revegetation and the importance of genetic and evolutionary perspectives. Proceedings: wildland shrub and arid land restoration symposiums; 1993 October 19-21; Las Vegas, NV. Gen. Tech. Rep. INT-GTR-315 U.S. Department of Agriculture, Forest Service, Intermountain Research Station.        [ Links ]

MADRIGALl, S.X. 1967. Contribución al conocimiento de los bosques de oyamel (A. religiosa) en el Valle de México. Inst, Nal,  Invest. Forest., S.A.R.H., Bol. Téc.18 : 94 pp.        [ Links ]

MARGOLIS, H.A., BRAND, D.G., 1990. An ecophysiological basis for understanding plantation establishment. Can. J. For. Res. 20 : 375-390.        [ Links ]

MARTÍNEZ, M., 1948. Los pinos de México. 2ª. Edición, Editorial Botas, México, 361 pp.        [ Links ]

MESSIER, Ch., 1993. Factors limiting early growth of western redcedar, western hemlock and Sitcka spruce seedlings on ericaceous-dominated clear-cut sites in coastal British Columbia. For. Ecol. Manage. 60 : 181-206.        [ Links ]

MICHELSEN, A., LISANEWORK, N., FRIIS, I., HOLST, N., 1996. Comparison of understorey vegetation and soil fertility in plantations and adjacent natural forests in the Ethiopian highlands. J. Appl. Ecol. 33 : 627-642.        [ Links ]

MIRANDA, F. 1941. Estudios sobre la vegetación de México. La vegetación de los cerros al sur de la Meseta del Anáhuac. An. Inst. Biol. Mex. 12 : 569-614.        [ Links ]

MIROV, N.T., 1967. The genus Pinus. Ronald Press Co. New York., 602 pp.        [ Links ]

PRONARE, 2001. Programa nacional de reforestación.        [ Links ]

REHFELDT, G.E., 1985. Ecological genetics of Pinus contorta in the Wasatch and Uinta Mountains of Utah. Can. J. For. Res. 15 : 524-530.        [ Links ]

RITCHIE, G.A., YASOUMI, T., MEADE, R., DUKE, S.D., 1993. Field survival and early growth of Douglas-fir rooting cuttings: relationship to stem diameter and root system quality. For. Ecol. Manage. 60 : 237-256.        [ Links ]

ROJAS, R.F., KEYES, M.R., MARTÍNEZ, G.A., 1988. Susceptibilidad al substrato edáfico y a la sequía de 10 especies de pinos. Agrociencia. 72 : 183-196.        [ Links ]

SALAS-GONZALEZ R., HOULLIER F., LEMOINE B., PIERRAT J.C., Représentativité locale des placettes d'inventaire en vue de l'estimation des caractéristiques dendrométriques de peuplement. Ann. Sci. For. 50(1993) : 469-485.        [ Links ]

RZEDOWSKI, J., 1954. Vegetación del pedregal de San Angel.An. Esc. Nal. Cienc. Biól. 8(1-2) : 59-129.        [ Links ]

SAS Institute Inc. 1988. SAS/ETS user's guide, version 6, 1^st edition, SAS Institute Inc.        [ Links ]

SEMARNAP, 1988. Ley Forestal. Secretaria del medio ambiente, recursos naturales y pesca. México.        [ Links ]

TABATABAI, A.M., BREMNER, M.J. 1990. Automated instruments for determination of total carbon, nitrogen and sulfur in soils by combustion techniquesModern Instrumental Techniques. Zeith A. Smith. ed. Marcel Decker Inc., New York.        [ Links ]

WALKLEY, A. 1946. A critical examination of rapid method for determining carbon in soils-effect variations in digestion conditions and inorganic soil constituents. Soil. Sci. 63 : 251-263.        [ Links ]

Submetido da publicação em Julho de 2001

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