Tesis Maestría en Ciencias en Recursos Naturales y Desarrollo Rural El Colegio de la Frontera Sur 2001

Bibliografía: hojas 11-13

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We studied succession during five years in 12 permanent plots in a tropical forest in southeastem Mexico in relation to three different types of disturbance (slash and bum, slash and bulldozer removal). Before the treatments were applied to the plots, original vegetation was characterized using the following parameters: composition, dominance, diversity and ordination. The study began in 1996, in 1997 a second survey was made in order to caracterize the early secondary vegetation and a third survey was made in 2001. The 1996 pre-treatment vegetation presented no significant differences in measured parameters, hi 1997, the vegetation showed differences in dominance and diversity, with a clear separation o f the slash treatment compared with the other treatments, hi 2001, the differences decreased considerably. The comparison between serai stages indicated that early secondary vegetation is clearly different from the original vegetation, while the five-year-old vegetation presented conditions similar to the original in relation diversity, floristic composition and dominance. Our results indicate that the effect o f disturbance is important only in the early stage of succession, but tends to dissappear as time passes. Furthermore, we found that the presence of nearby undisturbed patches were an essential component in the regeneration o f disturbed areas, regardless the type of disturbance. Inglés

Manejo y Conservación de Recursos Naturales

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