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A comparison of fine-scale distribution patterns of four plant groups in an Amazonian rainforest

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We carried out a comparison among the floristic patterns of four different plant groups (palms, trees, melastomes and pteridophytes) in a lowland rainforest site in Peruvian Amazonia. The study site consisted of a mosaic of edaphic patches reflecting the different geological formations that can be found on the surface. We collected the data along a linear transect (500 m long, divided into 20×20 m or 5×20 m subplots), and recorded of the four plant groups all individuals that exceeded a minimum size limit predefined for each plant group. We also recorded the drainage conditions and soil type classes in each subplot of the transect. The results indicated that different plant groups can produce similar floristic patterns in local spatial scales, and that these patterns reflect similarities in edaphic conditions. All matrix correlations calculated between pairs of the four plant groups were positive and statistically significant. Floristic composition in all plant groups correlated with soil class, and to a somewhat lesser degree with drainage. These results imply that any one of the four plant groups could serve as a rough indicator of more general floristic patterns, and that even the inventory of a limited part of the flora can shed light on the floristic variation found in Amazonian forests.
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Document Type: Original Article

Publication date: June 1, 2000

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