Estudo florístico do componente herbáceo e relação com solos em áreas de caatinga do embasamento cristalino e bacia sedimentar, Petrolândia, PE, Brasil

Abstract

Palavras-chave: caatinga, florística, formas de vida, herbáceas, solosABSTRACT -(Herbaceous floristic study and relationship with soil of crystalline shield and sedimentary basin caatinga areas at Petrolândia, Pernambuco State, Brazil). Floristic surveys were carried out in two close caatinga areas, one on the crystalline shield and the other on a sedimentary basin, both at Petrolândia, Pernambuco, Brazil, with the objective of identifying differences between the two areas in composition, habit and life form of the herbaceous flora. One hundred 1×1 m plots were established in each area and all the herbaceous species were identified. Soil samples were collected at 0-20 and 20-40 cm depths. In general, the soil in the crystalline shield area was shallower, had greater clay content, with higher water holding capacity, and was more fertile. The number of families, genera and species in the sedimentary basin and crystalline shield areas were 32, 62 and 78 and 31, 53 and 69, respectively. The floristic similarity between the areas was high (75%). The clustering analysis showed that the floristic arrangements between the sampled plots are more similar within the areas than between areas, suggesting the existence of distinct groups. Soil type seems not to be a factor determining the floristic similarity, habit or life forms of the caatinga vegetation herbs when the areas are near, but it may influence the occurrence and the frequency of some species.

Análise da diversidade da vegetação herbácea em reservatório no semiárido brasileiro (açude Itans – RN)

“…Do ponto de vista lorístico e considerando o hábitat (zona de inundação), diversos trabalhos relatam um maior número de espécies herbáceas quando analisadas em relação aos solos em áreas de Caatinga do embasamento cristalino e bacia sedimentar (PINTO, 2008;COSTA et al, 2009;SILVA, et al, 2009). Essa diferenciação da riqueza de espécies por hábitat icou ainda mais evidente no trabalho de Araújo et al (2005), os quais realizam uma análise comparativa da diversidade de herbáceas em micro-hábitats rochoso, plano e ciliar.…”

“…Andrade et al (2009) comentaram sobre a importância das herbáceas na biodiversidade do bioma Caatinga, além destas comporem um dos estratos mais importantes da isionomia da Caatinga. Para o estrato herbáceo na Caatinga as pesquisas são escassas (e. g. ARAÚJO et al, 2005;COSTA et al, 2009;MEIRA DE ANDRADE, 2009;SILVA et al, 2009), e estudos acerca de herbáceas distribuídas em margens de reservatórios ainda se encontram em estágios iniciais de desenvolvimento de pesquisas (ARAÚJO et al, 2005;RODAL, 2010).…”

Interactions Between the Herbaceous and Shrubby-Arboreal Components in a Semiarid Region in the Northeast of Brazil: Competition or Facilitation?

“…were most abundant. In general, the woody flora of the area was characterized by the presence of species such as Amburana cearensis (SILVA et al, 2009;SILVA et al, 2013).…”

Regeneração Herbácea Em Áreas Degradadas De Caatinga Enriquecidas Com Árvores Nativas

“…Herbs represent a significant part of the Caatinga flora ARAÚJO et al, 2005;SILVA et al, 2009). This community is exuberant during the rainy season, when soil moisture allows them to grow and complete their short life cycle and forage is abundant and nutritive.…”