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This study aimed to verify the correlation of abundance with the type of shell phorophytes and DBH on the abundance and richness of epiphytic orchids, the Environmental Protection Area (APA) Combu Island, Belem, Para, Brazil. The study was conducted on 2.85 ha, from the demarcation of 114 transects of 50 m x 5 m was measured every host-trees with DBH ≥ 20 cm and recorded the characteristics of the shell, and epiphytic orchids. The correlation between the type of bark of host-trees and abundance of epiphytic orchids was analyzed using the number of epiphytes by tree species phorophytes in x , and also the reason (epiphytes number/ phorophytes number) to phorophytes rough and non-wrinkled. The diameters were categorized into classes to check the influence of DBH on the abundance and wealth. Thirty-five species of host-trees (73%) had rough skin, especially Hevea brasiliensis and Carapa guianensis which were the most sampled (58 and 42) and more significant in number of epiphytic orchids, the ratio of epiphytes by phorophyte was higher in logs with bark non-rough. Classes of diameter 2 (31.8 ┤ 63.7) and 3 (63.7 ┤ 95.5) recorded the greatest abundance of epiphytic orchids. The abundance of epiphytic orchids is influenced by the roughness of the bark and the largest diameters phorophytes only correlated with abundance. keywords: interation; host; orquidaceae; floodplain forest; Amazon.

Forófitos Preferenciais de Orquídeas Epífitas na APA Ilha do Combu, Belém, Pará, Brasil