科研之友
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摘要
this study aims to check differences in the floristic composition and structure of the woody vegetation of the cerrado (sensu stricto) in two distinct topographic positions, interfluve (i) and valley slope (v) area in the bras赤lia botanic gardens, federal district, brazil. in each area ten 20x50m permanent plots were located to survey individuals, basal diameter bd(30cm) %26gt; 5cm. upgma classification (sˋrensen and morisita similarity indices) was used to assess similarity among plots. phytosociological analysis indicated the most important species in the interfluve site as: ouratea hexasperma (a. st.hil) baill., miconia ferruginata dc. and dalbergia miscolobium benth., while eriotheca pubescens (mart. %26 zucc.) schott %26 endl., ouratea hexasperma (a. st.hil.) baill. and schefflera macrocarpa (seem) d.c. frodin were important in the valley slope area. sˋrensen and morisita indices ranged from 0.26 to 0.81 (sˋrensen) and from 0.06 to 0.92 respectively. upgma classification indicated two main groups in accordance with positions in topography: interfluvic area and valley slope. topography is highlighted as a strong determinant of the woody species population and community distribution, through its effect in the water table levels, which act in the floristic composition, density (i/v = 1,219/956 ind.ha-1) and basal area (i/v = 8.56/5.64m2.ha-1) in the cerrado (sensu stricto) of interfluve (i) and valley slope (v) in the bras赤lia botanic gardens, federal district, brazil.
