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    Structural and environmental variations in a continuum of gallery forest/savana stricto sensu in Itumirim, MG

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    Objetivou-se, com este trabalho, verificar as poss?veis correla??es entre as varia??es da estrutura, da diversidade de esp?cies e de varia??es do substrato num compartimento arb?reo em um cont?nuo de Mata de Galeria/Cerrado stricto sensu em Itumirim, sul de Minas Gerais. Os solos das ?reas de Mata de Galeria, transi??o e Cerrado stricto sensu apresentaram textura m?dia, acidez elevada com pH entre 4,5 e 5,0 e altos teores de alum?nio. O levantamento estrutural em todo o fragmento apresentou 1.347 indiv?duos que se distribu?ram em 39 fam?lias, 77 g?neros e 102 esp?cies. A fam?lia Fabaceae destacou-se pela maior riqueza de esp?cies seguida das fam?lias Myrtaceae, Lauraceae e Rubiaceae. As esp?cies Protium spruceanum e Myrsine umbellata foram superiores em todos os par?metros fitossociol?gicos, respectivamente, para as ?reas de Mata de Galeria e Cerrado stricto sensu. Na ?rea de transi??o, a esp?cie Copaifera langsdorffii obteve os maiores valores de ?rea basal e domin?ncia absoluta; j?, com rela??o ? densidade absoluta e valor de cobertura foi a esp?cie Myrsine umbellata. Os ?ndices de diversidade de Shannon (H') e os ?ndices de equabilidade de Pielou (J') para os tr?s ambientes foram de 3,57, 3,51 e 2,58 e 0,79, 0,88 e 0,77, respectivamente, para as ?reas de Mata de Galeria, transi??o e Cerrado stricto sensu. Por meio da an?lise de correspond?ncia retificada (DCA) observaram-se dois agrupamentos no diagrama da DCA: Agrupamento 1, contendo apenas as tr?s parcelas pertencentes ao Cerrado stricto sensu; Agrupamento 2, reunindo as demais parcelas amostradas abrangendo os ambientes de Mata de Galeria e transi??o.Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)Empresa de Pesquisa Agropecu?ria de Minas Gerais (EPAMIG)Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq)Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)This work verified the possible correlations among the variations of the strucuture, species diversity and variations of the substrate in a tree compartment in a continuum of Gallery Forest/Savana stricto sensu in Itumirim, southern of Minas Gerais. The soils of the areas of Gallery Forest, Transition Forest and Savana stricto sensu presented medium structure, high acidity with pH between 4.5 and 5.0 and high aluminum contents. The structural survey all over the patch presented 1,347 individuals distributed into 39 families, 77 genera and 102 species. The family Fabaceae stood out by the greatest richness of species followed by the families Myrtaceae, Lauraceae and Rubiaceae. The species Protium spruceanum and Myrsine umbellata were superior in all the phytosociological parameters, respectively, for all the areas of Gallery Forest and Savana stricto sensu. In the area of transition , the species Copaifera langsdorffii reached the highest values of basal area and absolute dominance; however, as regards to absolute density and cover value was the species Myrsine umbellata. Shannon's diversity indices (H') and Pielou's equatibility index (J') for the three places were of 3,57, 3,51 and 2,58 and 0,79, 0,88 and 0,77, respectively, for the areas of Gallery Forest, transition Forest and Savana stricto sensu. Through the rectified correspondence analysis (DCA), two groupings in the DCA diagram were found: grouping 1 containing only the three plots corresponding to the Savana stricto sensu; and grouping 2 joining together the other plots sampled encompassing the sites of Gallery and transition Forest
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