The survival and establishment potential of spores of Cyathea delgadii Sternb. in soils from Itirapina and Moji Guaçu (SP), Brazil

نویسندگان

  • THAIS DE BEAUCLAIR
  • GIL M. FELIPPE
چکیده

(The survival and establishment potential of spores of Cyathea delgadii Sternb. in soils from Itirapina and Moji Guaçu (SP), Brazil). Germination of spores of Cyathea delgadii was carried out in soils collected in March 1997 (rainy season) at three depths (0-5, 5-10 and 10-15 cm) from the cerrado, open-cerrado, gallery forest and marsh at Moji Guaçu and cerradão, cerrado and gallery forest at Pedregulho, in Itirapina, both in the state of São Paulo, Brazil. Viability of spores mixed with soil and buried in the cerrado at the Reserva in Moji Guaçu were conducted for up to 10 months. The spores germinated in all soils. Germination in the soils was significantly lower than in distilled water. Germination was higher in soils from the gallery forest and cerrado than from open cerrado, cerradão and marsh. The germination was the same in the soil samples from the three depths of gallery forest, cerrado and cerradão. Spores of C. delgadii maintained viability longer when buried in cerrado soil than when dry stored at 4°C. After 10 months germination was 50.5% in buried spores against 3.8% in spores of the same age and harvest, stored at 4°C. RESUMO (Sobrevivência e estabelecimento potencial de esporos de Cyathea delgadii Sternb. em solos de Itirapina e Moji Guaçu (SP), Brasil). Foi estudada a germinação de esporos de Cyathea delgadii em solos, coletados em março de 1997 (estação chuvosa) em três profundidades (0-5, 5-10 e 10-15cm), no cerrado, cerrado aberto, mata ciliar e brejo na Reserva Biológica e Estação Experimental de Moji Guaçu, em Moji Guaçu e no cerradão, cerrado e mata ciliar no Pedregulho, Estação Experimental de Itirapina, em Itirapina, estado de São Paulo, Brasil. A viabilidade foi estudada em esporos de C. delgadii armazenados, misturados com solo, no cerrado da Reserva em Moji Guaçu por 10 meses. Os esporos germinaram em todos os solos. A germinação em solos foi significativamente menor do que em água destilada, mas foi mais alta em solos da mata ciliar e cerrado do que nos solos de cerradão, cerrado aberto e brejo. A germinação foi semelhante para as três camadas de solo no caso da mata ciliar, cerrado e cerradão. A viabilidade foi mantida por mais tempo quando os esporos de C. delgadii foram armazenados em solo. Depois de 10 meses de armazenamento, a germinação foi de 50,5% em solo e de 3,8% para esporos, da mesma idade e coleta, armazenados a 4°C.

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تاریخ انتشار 2000