Data/hora: 09/06/2024 09:33:00

Provedor de dados: 	Acta Botanica Brasilica	
País: 	Brazil	
Título: 	Floristic diversity of the soil weed seed bank in a rice-growing area of Brazil: in situ and ex situ evaluation	
Autores: 	Mesquita,Mário Luiz Ribeiro; Andrade,Leonaldo Alves de; Pereira,Walter Esfrain.	
Data: 	2013-09-01	
Ano: 	2013	
Palavras-chave: 	Cyperaceae; Competition; Biological invasion; Phytosociology; Smallholder farmers.	
Resumo: 	The objective of this study was to compare the ex situ and in situ floristic diversity of the soil weed seed bank of a rice field in northeastern Brazil. In a rice field in the county of Bacabal, located in the state of Maranhão, thirty 25-m² plots were laid out. From 15 plots, soil samples (6/plot; n = 90) were taken with a soil probe (25 × 16 × 3 cm) and placed in aluminum trays in the greenhouse. From the remaining 15 plots, weed samples (6/plot; n = 90) were taken with the same soil probe. The number of seeds was estimated by germination. We evaluated the numbers of species and individuals, as well as the density, frequency, abundance and importance value (IV) for each species. Diversity was computed by the Shannon index (H'). We recorded 13,892 individuals (among 20 families, 40 genera and 60 species), of which 11,530 (among 50 species) germinated ex situ and 2,362 (among 34 species) germinated in situ. The family Cyperaceae had the highest number of species (16), followed by Poaceae (10). The dominant species, in situ and ex situ, were Schoenoplectus juncoides (IV=47.4%) and Ludwigia octovalvis (IV=34.8%), respectively. Floristic diversity was higher ex situ (H'=2.66). The information obtained here could help determine the infestation potential of these species, which could lead to improved management strategies.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300001	
Editor: 	Sociedade Botânica do Brasil	
Relação: 	10.1590/S0102-33062013000300001	
Formato: 	text/html	
Fonte: 	Acta Botanica Brasilica  v.27 n.3 2013	
Fonte: 	info:eu-repo/semantics/openAccess