Florística e zonação de espécies vegetais em veredas no Triângulo Mineiro, Brasil

Abstract

RESUMO(Florística e zonação de espécies vegetais em veredas no Triângulo Mineiro, Brasil) A riqueza e a distribuição das espécies vegetais, a profundidade do lençol freático e a textura do solo nas zonas de borda, meio e fundo foram determinadas em cinco veredas em Uberlândia e Uberaba, Minas Gerais. A amostragem florística foi desenvolvida, mensalmente de janeiro de 2002 a janeiro de 2003 em cada vereda. As coletas de solo e as medidas do lençol freático foram feitas na parte central de cada zona das veredas. Na amostragem florística foram encontradas 436 espécies pertencentes a 59 famílias e 206 gêneros. O número de espécies encontrado nas seis veredas variou de 146 a 219. Na zona de borda, foram coletadas entre 26 e 87 espécies enquanto na zona de meio, em geral, com maior riqueza específica foram registradas entre 78 e 111 espécies. A ordenação florística mostrou variabilidade entre as veredas situadas em solo argiloso e arenoso e entre as zonas com maior e menor umidade do solo. A maior retenção de água no solo argiloso pode ter interferido na variação da flora entre as veredas em solo argiloso e arenoso. Palavras-chave: região do cerrado, lençol freático, textura do solo. ABSTRACT(Floristic and zonation of plant species in palm marshes in the Triângulo Mineiro region, Brazil) This study was performed to determine the richness and distribution of plant species, the depth of the water table and the soil texture of the border, middle and lower zones of five palm marshes in Uberlândia and Uberaba, Minas Gerais. The floristic sampling was carried out monthly from January 2002 to January 2003. The soil sampling and water table measuring were made in the central area of each sampled zone. Sampled species totaled 436 and belonged to 59 families and 206 genera. The number of species found in six marshes ranged from 146 to 219. On the border area 26 to 87 species were collected, whereas in the middle area a greater richness (78 to 111 species) was obtained. The floristic ordination showed variability between marshes located in clayey and sandy soils and between areas with high and low soil humidity. The highest water storage in the clayey soil may have interfered with discrimination of floras between the marshes on clayey and sandy soils.

Structure of Natural Regeneration in Relation to Soil Properties and Disturbance in Two Swamp Forests

“…There are few studies on vereda vegetation GUIMARÃES et al, 2002;MEIRELES et al, 2004;OLIVEIRA et al, 2009), specially about the swamp forests in veredas (BAHIA et al, 2009) and no studies about natural regeneration The aim of this study was to characterize the floristic structure of regenerating tree communities in two swamp forests with different environmental impacts histories. The following questions drove this study: (i) is there variation in the composition and structure of naturally regenerating plant communities between the two study sites?…”

Kavalactones and Benzoic Acid Derivatives from Leaves of Piper fuligineum Kunth (Piperaceae)

“…[27][28][29][30] This species was previously found to contain the kavalactone demethoxy-yagonin ((E)-4-methoxy-6-styryl-2H-pyran-2-one (1)), which showed inhibitory activity towards hepatitis C virus replication. 31 In addition to 1, we also report the isolation of two kavalactones from P. fuligineum leaves, 4-methoxy-6-(3-phenyloxiran-2-yl)-2H-pyran-2-one (2) and 6-(1,2-dihydroxy-2-phenylethyl)-4-methoxy-2H-pyran-2-one (3), as well as three benzoic acid derivatives, methyl-4-methoxy-3-(3'-methyl-2'-butenyl) benzoate (4), methyl 2,2-dimethyl-4-oxochroman-6-carboxylate (5), and methyl 4-methoxy-3-(3-methylbut-2-enoyl)benzoate (6).…”

Regeneração natural, relações ambientais e invasão biológica em duas veredas do Triângulo Mineiro

“…Therefore we could notice the sites hold distinct floristic compositions even showing similar ecological zonation features. The low similarity between the two sites might be related to distinct disturbance levels and soil humidity conditions, since variations in soil humidity can result in differences in plant community composition either between zones in a vereda area or between veredas areas [5]. Although the formation of distinct floristic zones between edge, middle and backwards plots is not clear we observed a lower similarity between edge and backwards plots when compared to all the other categories -comparison made amongst distinct categories and the same categories.…”

“…Distinct flood levels and edaphic characteristics can generate distinct plant species gradients which vary as much as their coverage and soil conditions tolerance [1] [5]. Thus veredas can show three distinct floristic areas: edge, middle and backwards [1].…”

“…Although they are not directly affected, the veredas are highly sensible to environmental disturbances in their surroundings [5]. The edge areas can show significant changes in their floristic composition, according to the characteristics and disturbance levels of the surrounding areas [12].…”