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Objetivou-se analisar o crescimento inicial de seis especies de ocorrencia na caatinga Prosopis juliflora (Sw.) DC.; Anadenanthera macrocarpa (Benth.) Brenan; Poincianella pyramidalis Tul.; Piptadenia stipulacea (Benth) Ducke; Erythrina velutina Willd.; e, Enterolobium contortisiliquum (Vell.) Morong. Assim, foi conduzido um experimento em viveiro, no municipio de Serra Talhada-PE. As sementes foram submetidas a tratamentos pre-germinativos. Cada especie constituiu um tratamento, dispostas em delineamento inteiramente casualizado. A reposicao de agua foi feita com base na evapotranspiracao prevista para o periodo experimental. Aos 23, 37, 51, 65, 92 e 120 dias apos a semeadura foram feitas amostragens para se determinar a biomassa seca das plantas, bem como de suas partes, folhas, caule e raizes e parâmetros biometricos. Com os valores de biomassa seca e indice de area foliar foram determinados os seguintes indices morfofisiologicos: taxa de crescimento absoluto, taxa de crescimento relativo, area foliar especifica, razao de area foliar, razao de massa foliar. Tamboril e Algaroba foram aquelas que apresentaram melhores respostas biometricas e de acumulo de biomassa, em decorrencia dos seus desempenhos morfofisiologicos. Por sua vez, Angico Vermelho apresentou o menor crescimento inicial quando comparado com as demais especies.    A B S T R A C T The aimed to analyze the initial growth of six species of occurrence in the ‘caatinga’ vegetation, Prosopis juliflora (Sw.) DC.; Anadenanthera macrocarpa (Benth.) Brenan; Poincianella pyramidalis Tul.; Piptadenia stipulacea (Benth) Ducke; Erythrina velutina Willd.; e, Enterolobium contortisiliquum (Vell.) Morong.. Thus, an experiment was carried out in the nursery, in the municipality of Serra Talhada, PE. The seeds were subjected to germination treatment. Each species was a treatment, arranged in completely randomized design. The water replenishment was made on the basis of evapotranspiration for the experimental period. At the age of 23, 37, 51, 65, 92 and 120 days after sowing were done samples to determine the dry biomass of plants and their parts, leaves, stems and roots and biometric parameters. With the values of dry biomass and leaf area index were determined the following morphophysiologics indexes, absolute growth rate, relative growth rate, specific leaf area, leaf area ratio, leaf mass ratio. ‘Tamboril’ and ‘Algaroba’ were those which presented the best biometric responses and biomass accumulation, as a result of their performance morphophysiological. In turn, ‘Angico Vermelho’ presented the lowest initial growth when compared with the other species.  Keywords: growth analysis, morphophysiologics indexes, caatinga plants, increment rate.

Crescimento Inicial de Espécies Ocorrentes no Semiárido Brasileiro: Biomassa, Biometria e Análise Morfogênica (Initial growth of species occurring in the Brazilian semi-arid region: biomass, biometrics and Morfogenical Analysis)