-(Structure and aspects of natural regeneration of a Mixed Ombrophyllous Forest at Parque Estadual de Campos do Jordão, São Paulo State, Brazil). The objective of this study was to evaluate the floristics and structural differences between adult and regenerating components of a stretch of Mixed Ombrophyllous Forest at Parque Estadual de Campos do Jordão, within the scope of raising hypotheses on its successional trajectory. In order to sample the adult component (CBH ≥ 15 cm), 50 permanent plots of 10 × 20 m were allotted while five sub-plots of 1 × 1 m of the regenerating component (h ≥ 30 cm and CBH < 15 cm) were allotted in each plot. In the adult component, 1,770 individuals were sampled, distributed in 58 species, 38 genus and 26 families (H' = 3.08 and J = 0.73). In the regenerating component, 576 individuals, 55 species, 39 genus and 23 families (H' = 3.41 and J = 0.84) were sampled. We have concluded that procedures for conservation of the coniferous are needed. Key words: Araucaria angustifolia, phytogeography, phytosociology, regeneration, understorey RESUMO -(Estrutura e aspectos da regeneração natural de Floresta Ombrófila Mista no Parque Estadual de Campos do Jordão, SP, Brasil). O estudo buscou avaliar diferenças florísticas e estruturais entre os componentes adulto e regenerante de trecho de Floresta Ombrófila Mista em Campos do Jordão, a fim de levantar hipóteses sobre sua trajetória sucessional. Para amostragem do componente adulto (CAP ≥ 15 cm) foram instaladas 50 parcelas permanentes de 10 × 20 m e, em cada uma dessas, cinco subparcelas de 1 × 1 m para amostragem do componente regenerante (h ≥ 30 cm e CAP < 15 cm). No componente adulto foram amostrados 1.770 indivíduos, distribuídos em 58 espécies, 38 gêneros e 26 famílias (H' = 3,08 e J = 0,73). Já entre os regenerantes foram observados 576 indivíduos, 55 espécies, 39 gêneros e 23 famílias (H' = 3,41 e J = 0,84). Constatou-se que são necessárias ações de manejo para a conservação in situ das coníferas locais.
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