S. Dreveck

Inventário florístico florestal de Santa Catarina: espécies da Floresta Ombrófila Mista

Resumo estudo e resultado da amostragem sistematica da flora da floresta ombrofila mista em Santa Catarina, realizada em 155 pontos amostrais em toda a sua extensao e permite atualizar o conhecimento sobre a ocorrencia de especies. Foram registradas 925 especies de espermatofitas, distribuidas em 439 generos e 116 familias botânicas. A familia com a maior riqueza especifica foi Asteraceae (119 especies), seguida por Myrtaceae (88), Fabaceae (58) e Solanaceae (52). Dentre as familias restantes, 34 apresentaram somente uma e outras 27 tiveram duas especies registradas. Os generos com maior numero de especies foram Solanum (31 especies), Baccharis (27), Eugenia (23), Ocotea (21) e Myrcia (19). Araucaria angustifolia (Bertol.) Kuntze, Butia eriospatha (Mart. ex Drude) Becc., Ocotea odorifera (Vell.) Rohwer e O. porosa (Nees & Mart.) Barroso sao as especies ameacadas de extincao registradas. Entre todas as especies do componente arboreo ou arbustivo/subarboreo, 56,5% sao comuns a ambos os componentes e dentre as 194 especies arboreas citadas para o planalto catarinense, 157 foram amostradas pelo IFFSC. O levantamento floristico extra registrou 474 especies de angiospermas a mais do que o levantamento nas unidades amostrais do IFFSC. O IFFSC amostrou um conjunto significativo das especies do Dominio Floresta Atlântica. Estas coletas georreferenciadas e realizadas com uma amostragem sistematica e consistente, representam um importante avanco e atualizacao do conhecimento da flora de Santa Catarina. Inventarios sistematicos desta natureza sao necessarios as demais regioes no Sul do Brasil, para que se possa compor um banco de dados consistente e atualizado e possibilitar a implantacao de politicas de conservacao e manejo. Palavras-chave: coleta botânica, diversidade, Floresta de Araucaria, lista de especies, Mata Atlântica.

Pteridófitas de Santa Catarina: um olhar sobre os dados do Inventário Florístico Florestal de Santa Catarina, Brasil

Santa Catarina is the first Brazilian state to complete its Forest and Floristic Inventory, and is considered one of the states with a well-known flora. This region is covered by evergreen tropical rain forest, Araucaria forest, seasonal deciduous forest and associated ecosystems, and shows high species richness. This paper presents a list of ferns collected in 563 sampling units. Altogether, 324 species were recorded (300 ferns and 24 lycophytes), which belong to 29 families and 94 genera. The most diverse families are Polypodiaceae (49 species), Pteridaceae (42), and Dryopteridaceae (38). Asplenium and Thelypteris are the most diverse genera, with 27 species each, followed by Blechnum (15). Of importance, too, are the 75 species considered endemic to the biome. Eighteen new records for the flora of Santa Catarina were made. The distribution of species according to the vegetation type is the following: 288 species occur in evergreen tropical rainforest (of which 128 are exclusive to this vegetation type); 177 species in Araucaria forest (30 exclusively) and 57 species in seasonal deciduous forest (3 exclusively). In addition, 17 species were recorded for restinga. A collection of Asplenium lacinulatum, from an area of intense development, is first record for Santa Catarina, and another of Alansmia senilis is the first record for the South Region of Brazil.

Inventário de Dicksonia sellowiana Hook. em Santa Catarina

The intense exploitation of Dicksonia sellowiana has led this species to become endangered and to be included on the red list of threatened species. Therefore, this paper presents a study of D. sellowiana populations in Santa Catarina State, and points out the places where it occurs the most, the status of these populations and also evaluates the relationship between density, climatic variables and elevation. Two hundred and twenty-five sample plots, which were 4.000 m2 each, were located within the study area and based on a 10 x 10 km grid according to procedures of the Forest and Floristic Inventory of Santa Catarina. Dicksonia sellowiana was found in 94 of these plots, where it ranged from 1 to 391 individuals. The density of the species at higher elevations (above 1.000 m) seemed to be related to climatic data that directly influences the populations, as pointed out by the corrected Akaike Information Criterion (AICc). This study also found that the species populations exhibit high densities in the lower height and diameter ranges, reaching values up to 977 individuals/ha in some stands. The information obtained during this study makes it possible to suggest conservation measures for this species, such as areas to be conserved in a way that supports small farms.