The aim of the present study was to estimate Eichhornia crassipes biomass by a non-destructive method that uses allometric measurements of foliar structures; Methods: Aquatic macrophytes collected at different growth in a wetland were allometrically measured as (a) limbo length and width (b) petiole width and diameter. The same leaves were used to determine biomass, expressed in dry weight, after drying in an oven at 70 °C until constant weight; Results: The correlation between petiole length/ diameter with foliar biomass was r 2 = 0.7705; p < 0.001, and between limbo width/length and foliar biomass was r 2 = 0,8838; p < 0,001. It was shown that limbo width/length and petiole length/diameter are related to biomass. Two estimation models were built to estimate aerial biomass based on allometric and biomass data; Conclusion: Biomass values obtained with the model proposed in this study are similar to those obtained when the material was dried in the oven, as determined by the t test. The biomass determination model proposed in the present study was shown to be efficient, and allows the follow-up of plant growth in time.
A integração da sociedade com o meio ambiente, muitas vezes passa desapercebida no cotidiano de transeuntes que circulam por áreas verdes, por outro lado, o paisagismo urbano busca harmonia entre o ambiente natural e o construído. Buscou-se identificar as espécies nativas e exóticas encontradas nas áreas de uso comum do campus da Univates. Foram coletadas amostras de espécies arbóreas e arborescentes presentes nas áreas comuns do campus e, com auxílio de chaves dicotômicas específicas, realizou-se a identificação das mesmas. Foram encontradas 465 espécimes de 59 espécies, distribuídas em 26 famílias. As espécies exóticas tiveram uma maior ocorrência do que as nativas, sendo que foram encontradas 35 (50,3%) espécies exóticas e 27 (49,7%) nativas. As espécies encontradas com maior frequência foram Dypsis lutescens (65 indivíduos), Syagrus romanzoffiana (52 indivíduos), Inga marginata (77 indivíduos), Peltophorum dubium (21 indivíduos) e Bauhinia sp. (27 indivíduos). As espécies Butia capitata, Ficus cestrifolia e Ficus luschnathiana são destaque por sua importância ecológica. Visando proporcionar a maior interação entre os estudantes e o meio ambiente, foram implantadas placas com informações sobre ocorrência, nomenclatura científica e popular das espécies, contribuindo para conhecimento monitorado ou autoguiado bem como para a valorização e auxílio na manutenção dos ambientes verdes da Univates. Palavras-chave: Áreas verdes; identificação arbórea; interação; conhecimento autoguiado. ABSTRACTThe integration of society with the environment, often goes unnoticed in the daily circulating passersby green areas, on the other hand, urban landscaping seeks harmony between the natural and built environment. We aimed to identify native and exotic species found in the Univates campus common areas. Samples of the arborescent tree species from the common areas of the campus were collected and, with the aid of specific dichotomous keys, held their identification. We found 465 specimens of 59 species in 26 families. Exotic species had a higher incidence than the native, and 35 (50.3%) exotic species and 27 (49.7%) native species were found. The most frequently species found were Dypsis lutescens (65 individuals), Syagrus romanzoffiana (52 individuals), Inga marginata (77 individuals), Peltophorum dubium (21 individuals) and Bauhinia sp. (27 individuals). The species Butia capitata, Ficus luschnathiana and Ficus cestrifolia are highlighted by its ecological significance. Aiming to providing a greater interaction between the students and the environment, informational signs with data about the occurrence, scientific nomenclature and popular for knowledge or self-guided and monitored for recovery were implanted. That also aid to preserve the green environment idea at Univates. ISSN 1980-7694 ON-LINE Soc. Bras. de Arborização Urbana REVSBAU, Piracicaba -SP, v.8, n.4, p 125-132, 2013 132 SOBRAL, M. ; JARENKOW, J. A.; BRACK, P.; IRGANG, B.; LAROCCA, J.; RODRIGUES, R. S. Flora arbórea e arborescente do Rio Grande do Sul, Brasil. 2ª ed....
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