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Spatial variation in the structure and floristic composition of "restinga" vegetation in southeastern Brazil Rev. Bras. Bot.
Pimentel,Marina C.P.; Barros,Marx J.; Cirne,Paulo; Mattos,Eduardo A. de; Oliveira,Rodrigo C.; Pereira,Miriam C.A.; Scarano,Fabio R.; Zaluar,Henrique L.T.; Araujo,Dorothy S.D..
We examined large-scale spatial variation of structural parameters and floristic composition in open Clusia scrub, a vegetation type of the Brazilian "restingas" (sandy coastal plain vegetation). This vegetation is organized in islands separated by sandy stretches with sparse herbaceous vegetation. We located 12 sample areas on three consecutive beach ridges, lying parallel to the coastline and at different distances from the ocean, in close proximity to two lagoons (Cabiúnas and Comprida). Each sample area was divided into three strips. We used the line intercept method to sample all woody plants ³ 50 cm tall. We used nested ANOVA to verify structural variation between different sampling scales. TWINSPAN analysis was performed to examine the variation in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phytosociology; Plant community; Sampling scale; Sandy coastal plain.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000300018
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Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil Braz. J. Plant Physiol.
Cirne,Paulo; Miranda,Heloisa Sinátora.
Effects of prescribed fires on survival and release of seeds of the woody species Kielmeyera coriacea (Clusiaceae) were investigated in two plots of cerrado sensu stricto, a savanna vegetation of Central Brazil. The first plot was burnt in June, at the beginning of the dry season, and the second in August, in the middle of the dry season. Seed survival was measured after fire in both areas and related to internal and external fruit temperatures measured during the June fire. The proportion of open fruits per individual of K. coriacea was also assessed at two-week intervals. Maximum external temperatures during fire (393 to 734ºC) were strongly reduced inside the fruits (61 to 63ºC). Before the June fire, the majority of the fruits were closed in both...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Fire season; Fruit temperature; Germination; Seed release.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300004
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