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Foram efetuados estudos fenológicos de 10 espécies arbóreas de valor econômico, ocorrentes em uma área de caatinga (Alagoinha-PE). Durante 6 anos (1982 a 1988) observações fenológicas foram realizadas, porém o ano de 1986 foi considerado como ponto de referência para a análise, com registro de observações fenológicas, mensalmente. Analisaram-se as fenofases de queda foliar, formação de novas folhas, floração e frutificação, utilizando-se 3 indivíduos de cada espécie selecionada. As espécies estudadas apresentaram quanto aos aspectos fenológicos 2 grupos de comportamento: perenes, com substituição de novas folhas do início para o final do período seco e floração apenas no período chuvoso, exceto Ziziphus joazeiro Mart, que floresceu no final do período seco (dezembro). Decíduas, queda foliar, no intervalo de 1 a 3 meses, no final do período seco; 2 espécies floresceram no período seco (folhas novas e floração quase simultâneas); 2 espécies floresceram no período chuvoso (folhas novas e floração em etapas distintas) e 2 espécies (Aspidosperma pyrifolium Mart, e Caesalpinia pyramidalis Tul.) obtiveram 2 picos de floração em cada período, com formação de novas folhas de imediato. Quanto à frutificação 7 das 10 espécies, frutificaram no final do período seco para o início das chuvas, as demais no período chuvoso. Phenological studies were carried out on 10 tree species of economical value occurring in a caatinga area (Alagoinha-PE). The observations were made over a period of 6 years (1982 to 1988), but 1986 was considered as the reference point for the analysis, when monthly phenological records were made. The phenophases of leaf fall, new leaf formation, flowering and fruiting were analyzed using 3 individuals per selected species. The species studied were divided into two groups in terms of phenological behavior: evergreens with leaf replacement from the begirining to the end of the dry season and flowering only during the rainy season, except for Ziziphus joazeiro Mart, which flowered at the end of the dry season (December). Deciduos trees casting leaves over a period of 1 to 3 months ot the end of the dry season; 2 species flowered during the dry season (new leaves and flowering occurring almost simultaneously); 2 species flowered during the rainy season (new leaves and flowering occurring at different times), and 2 species (Aspidosperma pyrifolium Mart, and Caesalpinia pyramidalis Tul.) showed two flowering peaks during each season, with immediate formation of new leaves. Seven of the 10 species studied produced fruits from the end of the dry season to the beginning of the rainy season, and the remaining ones produced fruit during the rainy season

Dados fenológicos de 10 espécies arbóreas de uma área de caatinga (Alagoinha-PE)