Resumo

VELA-CORREA, Gilberto; VAZQUEZ-MARTINEZ, Blanca E.; RODRIGUEZ-GAMINO, Ma. de Lourdes  e  DOMINGUEZ-RUBIO, Irma V.. Edafic characterization of sites with natural regeneration of Pinus montezumae Lamb., in the La Malinche volcano, México. Agrociencia [online]. 2007, vol.41, n.4, pp.371-383. ISSN 2521-9766.

Natural plant regeneration occurs in sites where the edafoclimatic conditions are adequate for initiating germination and where new seedlings can be established that will occupy the place of the trees when they reach their lifespan limit. The objectives of the present study were to quantify the natural population of seedlings of Pinus montezumae Lamb., and to determine the physical and chemical properties in the soils of five sites in La Malinche, México. Because of their physical and chemical characteristics, the soils of the studied sites are very similar, as they form from the weathering of volcanic ash, thus they present an A/C evolution sequence; they have a subangular polyhedral structure, are weakly developed; with abundant roots; the bulk and particle density permit the adequate exchange of air and nutrient absorption. There is predominance of sandy-lumpy textures in the superficial horizons, which present a very acid pH, they are rich in OM, with a mean CEC and a saturation of bases of over 50%, dominated by Ca2+. The sites between 3000 to 3200 m with orientation to the N had 58% of the seedling population of P. montezumae Lamb., in which there is predominance of those with a size of 1.50 to 2.50 m. In the sites where the altitude is greater than 3200 m, the population of P. montezumae Lamb., decreased notably, reaching 7% of the total, with a height of 8 to 12 m, those of greatest size. Therefore, it is considered that altitude and temperature are the principal factors that determine the presence of seedlings. The parent trees present conditions adequate for releasing seeds and propitiating the continuity of the forest mass, although their number decreases in altitudes of over 3000 m, due to the clandestine felling of trees and forest fires. An understory comprised of Muhlenbergia macroura (HBK)., Stipa ichu (Ruiz & Pav) Kunth., and Lupinus elegans HBK. is also common, which are considered indicators of these activities.

Palavras-chave : Andosol; regeneration of pines; forest soils; Tlaxcala.

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