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Environmental changes during secondary succession in a tropical dry forest in Mexico

Published online by Cambridge University Press:  02 August 2011

Edwin Lebrija-Trejos*
Affiliation:
Wageningen University, Forest Ecology and Forest Management Group, Centre for Ecosystem Studies, P.O. Box 47, 6700 AA, Wageningen, the Netherlands
Eduardo A. Pérez-García
Affiliation:
Universidad Nacional Autónoma de México, Facultad de Ciencias, Departamento de Ecología y Recursos Naturales, Ciudad Universitaria, México 04510, D.F., México
Jorge A. Meave
Affiliation:
Universidad Nacional Autónoma de México, Facultad de Ciencias, Departamento de Ecología y Recursos Naturales, Ciudad Universitaria, México 04510, D.F., México
Lourens Poorter
Affiliation:
Wageningen University, Forest Ecology and Forest Management Group, Centre for Ecosystem Studies, P.O. Box 47, 6700 AA, Wageningen, the Netherlands
Frans Bongers
Affiliation:
Wageningen University, Forest Ecology and Forest Management Group, Centre for Ecosystem Studies, P.O. Box 47, 6700 AA, Wageningen, the Netherlands
*
1Corresponding author. Present address: Tel Aviv University, Faculty of Life Sciences, Department of Plant Sciences, Tel Aviv 69978, Israel. Email: elebrija@post.tau.ac.il

Abstract:

Vegetation and environment change mutually during secondary succession, yet the idiosyncrasies of the vegetation effect on the understorey environment are poorly understood. To test whether the successional understorey environment changes predictably and is shaped by the structure and seasonality of tropical dry forests, we estimated basal area and vegetation cover, and measured understorey temperature, light and moisture conditions, in 17 plots forming a 60-y chronosequence and a mature forest. Light and air and soil temperature decreased with time (75−15% of open-sky radiation, 31.7−29.3 °C, and +2.5 °C to −0.5 °C relative to ambient, respectively), whereas relative humidity increased (67−74%). Soil water availability increased with early-successional development (−45 to −1 kPa) but decreased afterwards (to −18 kPa). The first axis of a PCA of the rainy-season environment explained 60% of the variation and was strongly related to air temperature and relative humidity. During tropical dry-forest succession, such factors may be more important than light, the reduction in which is not extreme compared with taller and more vertically stratified wet forests. Seasonality significantly affected the successional environmental gradients, which were marked mainly during the wet season. Environmental heterogeneity was higher in the wet than in the dry season, and larger for resources (light and water) than for conditions (temperature and humidity). The wet-season increase in environmental heterogeneity potentially creates differential growing scenarios; the environmental harshness of the dry season would mostly challenge seedling survival.

Information

Type
Research Article
Copyright
Copyright © Cambridge University Press 2011

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