Chuva de sementes e regeneração natural sob três espécies arbóreas em uma floresta em processo de restauração

Abstract

-(Seed rain and natural regeneration under three woody species in a forest in process of restoration). The present study describes the composition of the natural regeneration and seed rain under three early successional tree species -Centrolobium tomentosum Guill. ex Benth. (Fabaceae), Cordia myxa L. (Boraginaceae) and Melia azedarach L. (Meliaceae) in a 15 year-old mixed plantation. Fifteen individuals of each species were selected, and under each crown two seed traps (1 m 2 each; total of 90 seed traps) were set, they were sampled monthly for one year. The natural regeneration was evaluated in circular plots (17.6 m 2 ) established under the projection of the crowns, where all individuals of woody species between 0.3 m and 2.0 m in height were counted and identified. The seed rain had higher mean density under M. azedarach and higher richness under C. myxa. Species diversity of natural regeneration was higher under M. azedarach and individuals were taller under C. myxa. Most of the individuals and species sampled were from early successional species, mainly exotic species. It is discussed the development of microsites and their influence on the community structure and composition.Key words -canopy, forest restoration, natural regeneration, seed rain RESUMO -(Chuva de sementes e regeneração natural sob três espécies arbóreas em uma floresta em processo de restauração). O presente estudo teve como objetivos caracterizar a composição da regeneração natural e da chuva de sementes presentes sob a copa de três espécies de início de sucessão -Centrolobium tomentosum Guill. ex Benth. ) sob as copas das árvores, onde foram amostrados os indivíduos arbustivo-arbóreos de 0,3 a 2,0 m de altura. A chuva de sementes sob M. azedarach apresentou maior densidade média e sob C. myxa maior riqueza. Quanto à regeneração natural, as comunidades diferenciaram-se em relação à diversidade de espécies (maior sob M. azedarach) e à estrutura (indivíduos maiores sob C. myxa) entre as espécies do dossel. A maioria dos indivíduos e espécies amostradas pertence aos estádios iniciais da sucessão e muitas, dentre as mais abundantes, são exóticas. Discute-se a formação de nichos de regeneração sob elas e a influência dessas na estrutura e composição dessas comunidades.Palavras-chave -chuva de sementes, dossel florestal, regeneração natural, restauração florestal

Evaluation of the Potential of Seed Rain as an Alternative for Forest Restoration in Permanent Preservation Areas1

“…Values are similar to other studies also carried out in riparian areas, ranging from 288 to 1,804.2 seeds/m² (MARIMON; FELFILI, 2006;PENHALBER;MANTOVANI, 1997). The total number of collected propagules resembles other previous seed rain researches already made in gallery forests (LAGOS; MARIMON, 2012;GANDOLFI, 2006), which shows a pattern in seedling numbers from seed rain in these areas, which is responsible for saving about a third of botanical diversity only inthe Brazilian Cerrado (SANO et al, 2008).…”

Chuva de sementes em remanescentes florestais de Campo Verde, MT

“…A maior produção de sementes foi obtida no final do período seco e início da fase chuvosa, resultados também reportados em outras formações florestais (PENHALBER; MANTOVANI, 1997;GROMBRONE-GUARATINI;RODRIGUES, 2002;ARAUJO et al, 2004;VIEIRA;GANDOLFI, 2006;LAGOS;MARIMON, 2012).…”

Seed germination and seedling emergence of the invasive exotic species, Clausena excavata

“…Medicinal properties of its leaves, bark and roots are known (Wu et al, 1998). In Brazil, its natural regeneration was related as predominant in a recovered forest (Vieira and Gandolfi, 2006), indicating its invasive potential. This species is known in Australia as a weed that is common in Christmas Island vegetation (Green et al, 2004) and as an invasive species in Hawaii (Space and Imada, 2004).…”