Composição florística e estrutura de um fragmento de vegetação savânica sobre os tabuleiros pré-litorâneos na zona urbana de Fortaleza, Ceará

Abstract

/ha e a altura e diâmetro médios foram, respectivamente, 2,53 ± 1,29 m e 6,68 ± 5,67 cm, o que enquadra a área estudada dentro da amplitude de variações encontradas em áreas de cerrado sensu stricto e campo cerrado. Os resultados alcançados incrementam as poucas informações sobre as savanas costeiras do nordeste. Palavras-chave: Cerrado, fitossociologia, florística, savanas pré-litorâneas, zona costeira. AbstractUrban growth promotes reduction in the vegetation cover, introduction of exotic species and has serious implications for biological conservation. In the urban area of Fortaleza, Ceará state, a vegetation fragment with savannic physiognomy (24 ha -3º47'55"S and 38º29'10"W) was sampled for a floristic survey and had 1 ha subjected to a phytosociological inventory. The floristic list of the fragment, considered a priority area for municipal conservation, is showed here. Phytosociological data have also been sampled, providing more information about the savannas from the Brazilian's Northeast coast. For the floristic list, species from all growth forms present in the fragment were collected. For the description of the structure of the vegetation, we assigned randomly eight transects with 5 × 250 m (1ha in total) in which the perimeters at ground level (PNS) and the total height of individual plants were measured for all woody plants with PNS greater than or equal to 9 cm. In the floristic survey we collected 151 species (138 indigenous and 13 exotic) and in the phytosociological study, 37 species (35 native). The density and basal coverage of the community were 1218 ind/ha and 7.34 m 2 /ha, respectively. The average height and average diameter were respectively 2.53 ± 1.29 m and 6.68 ± 5.67 cm. Although our study site is geographically out of the Cerrado domain, it has structural variables compatible with the ones observed within the range of variations found in other Cerrado areas.

O Complexo Vegetacional da Zona Litorânea no Ceará: Pecém, São Gonçalo do Amarante

“…As matas de tabuleiro são estrutural e fi sionomicamente muito distintas do cerrado costeiro estudado por Moro et al (2011), pois formam um dossel e a densidade e área basal são bem superiores mas ambas as formações possuem elementos fl orísticos em comum (e.g. Anacardium occidentale; Mouriri cearensis; Himatanthus drasticus; Byrsonima crassifolia etc.…”

“…1). Devido à proximidade geográfi ca do LSN com o domínio das Caatingas, do Cerrado e da Mata Atlântica, o LSN permite a formação de um ecótono muito peculiar: um complexo fl orístico-vegetacional que inclui espécies de caatinga, de cerrado, atlânticas e até amazônicas, além de outras espécies próprias das restingas (Fernandes 1990;1998;Figueiredo 1997;Matias & Nunes 2001;Moro et al 2011).…”

Accumulation of dry mass and macronutrients by sourgrass plants

“…Hairy woodrose was also observed requiring great amounts of macronutrients for plant growing (Martins et al, 2010), but it was not verified for ivyleaf morningglory plants (Guzzo et al, 2010). Apart from interfering indirectly with crop productivity due to block the reel of the combine in mechanical harvesting (Moro et al, 2011), climbing plants, such as hairy woodrose and ivyleaf morningglory, can also interfere directly with crop productivity by competition for environmental resources.…”

Thrips species (Insecta: Thysanoptera) associated with flowers in a restinga fragment in northeastern Brazil

“…Plants were identified by comparison with herbarium specimens and using specialized literature (Bridson and Forman, 1998;Esteves and Lacerda, 2000;Brito et al, 2006;Moro et al, 2011). Vouchers of the thrips are deposited in the collection of the Laboratory of Insect-Plant Interaction (UECE).…”