Floristic evolution in an agroforestry system cultivation in Southern Brazil.
Bracatinga (Mimosa scabrella Bentham) is an important pioneer tree species in Ombrophylous Mixed Forest of Brazil and is widely used as an energy source. In traditional agroforestry systems, regeneration is induced by fire, then pure and dense stands known as bracatinga stands (bracatingais) are formed. In the first year, annual crops are intercalated with the seedlings. At that time the seedlings are thinned, then the stands remain at a fallow period and cut at seven years old. The species is very important mainly for small landowners. We studied the understory species that occur naturally during the succession over several years in order to manage them rationally in the future and maintain the natural vegetation over time. Three to 20 year-old Bracatinga stands were sampled between 1998 and 2011. All tree species with diameter at breast height (DBH) ≥ 5 cm were measured.The floristic evolution was assessed with respect to Sociability Index, the Shannon Diversity Index and the Pielou Evenness Index. Graphs of rank/abundance over different age groups were evaluated using the Kolmogorov-Smirnov test. We identified 153 species dispersed throughout the understory and tend to become aggregated over time.
Universidade Federal do Paraná/UFPR, CIFLOMA - Engenharia Florestal, Avenida Prefeito Lothário Meissner, 900, 80210-170 Curitiba, PR, Brasil, Universidade Federal do Paraná, Universidade Federal do Paraná, Curitiba PR , Brazil.
Luís C R
LC
Silva
Universidade Federal do Paraná/UFPR, CIFLOMA - Engenharia Florestal, Avenida Prefeito Lothário Meissner, 900, 80210-170 Curitiba, PR, Brasil, Universidade Federal do Paraná, Universidade Federal do Paraná, Curitiba PR , Brazil.
Sebastião A
SA
Machado
Universidade Federal do Paraná/UFPR, CIFLOMA - Engenharia Florestal, Avenida Prefeito Lothário Meissner, 900, 80210-170 Curitiba, PR, Brasil, Universidade Federal do Paraná, Universidade Federal do Paraná, Curitiba PR , Brazil.
Franklin
F
Galvão
Universidade Estadual do Centro-Oeste/UNICENTRO, Departamento de Engenharia Florestal, Rodovia PR-153, Km 7, Caixa Postal 121, 84500-000 Irati, PR, Brasil, Universidade Estadual do Centro-Oeste, Universidade Estadual do Centro-Oeste, Departamento de Engenharia Florestal, Irati PR , Brazil.
Afonso
A
Figueiredo
D001938:Brazil; D017753:Ecosystem; D016468:Forestry / Q000379:methods*; D065928:Forests; D031298:Mimosa / Q000254:growth & development*; D036226:Seedlings; D013997:Time Factors; D014197:Trees / Q000254:growth & development*