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El clima de la selva baja caducifolia en México

ABSTRACT In this paper it is analyzed the main climatic characteristics of mexican seasonally dry tropical forest. In order to know the corresponding climatic environment for this type of vegetation, elements such as precipitation, temperature, days with appreciable rain, dry months and climate type, are evaluated with data from 390 climatological stations. Although the most suitable climate for this forest is the subhumid warm (Awo); it shows a wide distribution including dry and humide climates, due to the combined effect of environmental factors. The environmental variation of most dry forest locatlonship has a strong influence on their phlslonomic and structural characteristics.

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    ABSTRACT: The effects of nitrogen (N) and phosphorus (P) fertilization on seedling survival, recruitment, species richness and diversity in two abandoned tropical dry forests (10-yr old, young forest, and c. 60-yr old, old forest) in Yucatán, Mexico, were studied over two years. The seedling dynamics in the control plots were found to be highly seasonal with highest recruitment and lowest death rates during the rainy season. A low percentage of seedlings were resprouts; this important mechanism for forest regeneration had a higher-than-expected survival when compared to seedlings regenerated from seeds. Nutrient addition had significant effects on seedling dynamics in both of the forest regeneration stages. In the young forest, N fertilization facilitated the increase of seedling density. In the old forest, the addition of P decreased seedling diversity, while it increased the recruitment of only a few species. In both forests, P fertilization increased the survival time of seedlings when interacting with light availability and bulk density on the topsoil layer. Results suggest that low nutrient availability combined with low light availability constrain forest succession in Yucatán, Mexico.
    Plant Ecology 01/2004; 170(2):277-285. · 1.53 Impact Factor
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    ABSTRACT: Seedling dynamics were studied in a set of dominant tree species in regenerating secondary tropical dry forests (TDF) growing on limestone in the Yucatán Peninsula. The objective of the study was to assess how variation in nutrient availability affects the recruitment and survival of individual species considering natural variations in light and bulk density in the topsoil. Our study included an area of young forest (10 years old), with phosphorus-poor soils, and an area of old forest (≅60 years old). We used 16 plots ( m) per forest, in which we fertilized four plot replicates per treatment with nitrogen (N), phosphorus (P) and nitrogen plus phosphorus (NP). Another four replicates were kept as control. In four m sub-plots set of each experimental plot, tree seedling dynamics were studied over 2 years. The species with the highest recruitment were Acacia gaumeri and Leucaena leucocephala in the young forest, and Bursera simaruba and Phyllostyllon brasiliense in the old forest. Recruitment of A. gaumeri was affected more by light availability than fertilization, but its survival increased with N or with NP additions. Leucaena leucocephala benefited by fertilization (N, P, or NP) and the species regenerated on sites with lower light availability, but required high light conditions and N addition to increase its survival. The recruitment and survival of B. simaruba required low light availability, and the fertilization with P or with NP increased its regeneration. Phyllostyllon brasiliense was recruited only in the old forest. The addition of P resulted in the highest recruitment and the lowest survival among fertilization treatments, leading to a negative final seedling density. Canonical analysis revealed that in the young forest, the most important variables that influenced species recruitment were bulk density in the topsoil, fertilization with P, fertilization with N, and light availability. In the old forest, the P and N fertilizations and bulk density in the topsoil appeared to be the most important variables; only light was not significant. Light requirement differences between forests suggest that a large number of opportunistic species in the young forest could exist there. Overall, our results suggest that the dynamic of understory vegetation in Yucatán Peninsula is strongly influenced by nutrient availability, especially P. The responses of seedling dominant species to nutrient addition will vary, depending on the details of the site’s light availability and soil bulk density, and the identity of species.
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