Angela Luciana de Avila

Maturação fisiológica e coleta de sementes de Eugenia uniflora L. (Pitanga), Santa Maria, RS.

This study aimed to accompany the physiologic maturation, their indicative parameters and to identify the moment adapted for the seed harvest of Eugenia uniflora , evaluating also the incidence of fungus in fruits and seeds. The research was carried out from August to October of 2004 in Santa Maria, RS. Samples of fruits and seeds were collected weekly, from three main trees, with beginning to the seven days after the anthesis (DAA) and end to the 77 DAA. The observed variables were: length, diameter, weight and sanity of fruits and seeds and moisture content, dry mass and germination of the seeds. The appropriate time for the seed harvest, in the period and place being studied, occurred between 56 and 63 DAA, when the fruits presented red coloration and the seeds high germination. In that period, the size and the weight of fruits and seeds reached their maximum values and the moisture content and dry mass of the seeds showed tendency to the stabilization. The fungi Cladosporium sp. and Alternaria sp. presented the largest incidence taxes in the fruits and in the seeds and they can influence the storage and the germination Eugenia uniflora seeds.

Caracterização da vegetação e espécies para recuperação de mata ciliar, Ijuí, RS

Riparian forests form ecological corridors and enable the preservation of biodiversity and water resources. The maintenance of these ecological functions often requires the environmental restoration of these ecosystems. Thus, we aimed to characterize the arboreal vegetation and identify species for recovery in areas of riparian forests. The study was conducted in two fragments on the left and right banks of the river Ijui, in the municipality of Ijui, RS. The vegetation was inventoried in 10 systematic strips, of lengths from 15-35 m, perpendicular to the river, with a distance of 50 m, which were subdivided into plots of 10 x 10 m, totaling 21, in which were identified and measured all individuals with girth breast height (GBH) ≥ 15cm. Data from the inventory were used in the floristic and structural characterization of vegetation, in a clustering analysis (TWINSPAN) and supplied a basis for the indication of species for recovery. We identified 38 species distributed in 20 families. The three groups formed showed different succession stages. For the environmental recovery of altered areas, with similar environmental characteristics, it is suggested the use of Ateleia glazioviana , Helietta apiculata , Dalbergia frutescens and Parapiptadenia rigida as these facilitate succession. The planting of Eugenia uniflora and Prunus myrtifolia can help in attracting disperser fauna. Cupania vernalis and Pilocarpus pennatifolius may be used for the enrichment of areas in a more advanced stage of forest succession.

Dimensionamento amostral para avaliação de altura e diâmetro de mudas de Cabralea canjerana

In nurseries, it is important to determine the number of plants to be evaluated so that inferences about seedling growth are reliable. The aim of this research was to estimate the sample size (number of plants) necessary to evaluate plant height, collar diameter and relation plant height/collar diameter of canjerana seedlings (Cabralea canjerana (Vell.) Mart.) and to verify its variability among tubes, substrates and ages evaluation. An experiment was conducted in the nursery, in which nine treatments, organized in randomizes blocks design with four replication, were formed by the combination of three sizes of tubes (100, 180 and 280cm3) and three substrates (100% peat, 80% peat + 20% rice hulls and 60% peat + 40% rice hulls). It was evaluated the following characters, in ten ages: plant height, collar diameter and relation plant height/collar diameter, in ten plants sampled at random in each experimental unit. Analyses of variance, means comparison tests and verification of normality were carried and the sample size was calculated. The sample size to evaluate the plant height, collar diameter and relation plant height/collar diameter of canjerana seedlings is dependent on age evaluation. For the tubes, substrates and ages evaluation studied, 18 plants per experimental unit (pot) are enough to predict the these characters average, with an estimation error equal to 10% of estimated average, with a degree confidence of 95%.

Identificação de substrato adequado para germinação de sementes de Allophylus edulis (A. St.-Hil., A. Juss. & Cambess.) Radlk.

Este trabalho objetivou identificar a melhor metodologia que expressasse a germinacao e a qualidade das sementes de Allophylus edulis, analisando diferentes substratos. Inicialmente, realizou-se a caracterizacao do lote atraves de Peso de Mil Sementes (PMS), Teor de Agua (TA) e Condutividade Eletrica (CE). No Teste de Germinacao foram avaliados os seguintes tratamentos (substratos): sobre papel mata-borao (PMB), sobre papel filtro (SPF), sobre (SA) e entre areia (EA), sobre (SV) e entre vermiculita (EV) e rolo de papel (RP), sendo conduzidos em câmara de germinacao Mangelsdorf (25 °C). Os dados foram expressos em percentagem de plântulas normais, anormais, sementes mortas e firmes e ainda, avaliado o indice de velocidade de germinacao. Foi utilizado o delineamento inteiramente casualizado com quatro repeticoes por tratamento. Os substratos sobre areia (SA) e entre vermiculita (EV) foram os mais adequados para o teste de germinacao, sendo que a primeira contagem de plântulas normais pode ser feita entre 12 e 15 dias e a final aos 24 dias apos a semeadura