Luciano Farinha Watzlawick

Análise florística e estrutural de um fragmento de Floresta Ombrófila Mista Montana, situado em Criúva, RS - Brasil.

The aim of this paper was to know and analyze the floristic composition and describe the structure of the arboreous component of a fragment of Montane Mixed Ombrophylous Forest in Criuva – State of Rio Grande do Sul, Brazil. Were inventoried 673 individuous with DBH ³ 5 cm eight 10 x 100 m plots, distributed into 37 species, 32 genera and 22 families. The Shannon diversity index was 2,768. The families which presented the largest number of individuous were: Araucariaceae, Myrsinaceae, Euphorbiaceae, Anacardiaceae and Rutaceae. The forest canopy is dominated by Araucaria angustifolia and the understory, by species of the families Lauraceae and Myrtaceae. The total density found was 841,25 individuous/ha, the mean DBH was 24,01 cm and the highest VI values, in descending order, were: Araucaria angustifolia , Sebastiania commersoniana , Lithraea brasiliensis , Zanthoxylum rhoifolium and Myrcia sp.. The fragment presents a considerable floristic diversity of species, in spite of the suffered disturbances in the past. For the vegetation to reach the floristic and structural characteristics close to the one of the original vegetation it is necessary to avoid the presence of bovine and equine in the area and explorations of the forest.

DENSIDADE BASICA DA MADEIRA DE CONGONHA (ILEX MICRODONTA REISS.), AO LONGO DO FUSTE

The objective of this study was to determine the wood basic densityvariation along the tree trunk of Ilex microdonta. Three trees had been sampledat random in forest located in the South Region of Parana State. The basicdensity was determinated in samples from internal and external wood from diskwithout bark collected at 0%, 25%, 50%, 75%, the 100% from trunk height andat DBH, being that the 100% corresponded to the point of morphologicinversion. The average basic density of the trees was weighed in relation to thetree log volume. The results had shown that the basic density range along thetree trunk did not show large variations, being of approximately 0,52 g.cm-3.