Suelen Carpenedo Aimi

ANÁLISE DE AGRUPAMENTOS EM REMANESCENTE DE FLORESTA ESTACIONAL DECIDUAL

This study intended to analyze the presence of clusters in the vegetation of Seasonal Deciduous Forest

REUTILIZATION OF RESIDUES AS COMPONENTS OF SUBSTRATE FOR THE PRODUCTION OF Eucalyptus grandis SEEDLINGS

Increased production of agro-industrial waste is a global concern, requiring proper disposal. In this sense, they can represent alternative sources for substrate production, adding value to the materials and reducing the cost of seedlings in the nursery. However, their proportions in the mixture should be adequate for better use of water and nutrients, ensuring better seedling quality. The objective of this study was to identify the potential of rice husk and peach kernel residue, as a secondary substrate component, for the production of Eucalyptus grandis seedlings. The carbonated (CRH), hydrolyzed (HRH) rice husk and crushed peach kernel (CPK) were added at 0, 10, 20 and 30% to an organic substrate. The results were submitted to analysis of variance and correlation analysis between the variables of the substrates and the morphological and physiological attributes. The results indicated that the HRH and CPK can add value to the agro-industrial residue when mixed to the organic compound in proportions of 20 and 10%, respectively, being adequate and compatible with the use of CRH in the proportion of up to 30%. Eucalyptus grandis seedlings, after 90 days of cultivation, presented quality to be hardened and dispatched when grown on organic compound substrates with up to 30% CRH, 20% HRH and 10% CPK. v.24 n.2 2018

Intensidad de sombra como condición para la plantación de especies forestales: estudio con Apuleia leiocarpa

This study aimed at identifying the most appropriate level of shading for initial growth of Apuleia leiocarpa seedlings, through their survival, morphological and physiological/biochemical parameters. The following treatments were evaluated: 0 (full sun), 18, 50 and 70 % of shading. Survival was assessed at 30 and 360 days after planting and morphological parameters such as height (H), stem diameter (SD) and H/SD ratio were measured bimonthly for a year. Physiological parameters as contents of chlorophyll a, chlorophyll b, chlorophyll a/b ratio, carotenoids, lipid peroxidation, acid phosphatase enzyme activity, initial fluorescence, maximum fluorescence, maximum quantum yield of photosystem II and electron transport rate were estimated at 180 and 360 days after planting. At 30 days after planting (d.a.p) there was no mortality of Apuleia leiocarpa seedlings influence of different levels of shading. In the assessments performed at 180 and 360 d.a.p., there was no significant difference among levels of shading for H and SD. However, high mortality rates were observed at 360 d.a.p., especially in full sun. Morphological and physiological parameters of Apuleia leiocarpa plants showed this species requires shading (18 and 50 %) in their early stages of growth.

Regímenes de riego y dosis de polímero hidroretenedor sobre características morfológicas y fisiológicas de plantas de Cordia trichotoma

The objective of this research was to define which irrigation regime, whether or not combined with water retaining polymer doses added to the substrate, is recommended in the production of Cordia trichotoma seedlings. The substrate was used with different dosages of water retaining polymers (0, 1.5, 3.0 and 4.5 g L-1). After emergence the seedlings were subjected to different irrigation regimes (4-4-4, 4-8-8, 4-8-12, 8-8-8, 8-12-12 and 12-12-12 mm day-1, alternating them every 60 days). The experiment was conducted in a completely randomized design in a split plot scheme, where the main plot was formed by the different irrigation regimes and subplots by doses of a hidroretentor polymer. After 180 days of applying the irrigation blades, the following morphological and physiological variables were obtained. Seedlings are intolerant to water stress after 180 days under blade 4 or 12 mm constant irrigation. The permanent use of the 4 mm day-1 blade is possible, since associated with an addition of approximately 2.4 g L-1 dose of a water retaining polymer to the substrate. A suitable growth of seedlings was obtained with blades of 4-8-8 mm day-1, alternating every 60 days with the possibility of using a smaller blade at the start of growth, thereby reducing water consumption.

FITOSSOCIOLOGIA E AUTOECOLOGIA SUBSIDIANDO A RESTAURAÇÃO DE MATA CILIAR, EM REGIÃO DE TRANSIÇÃO CAMPO-FLORESTA

The objective of this study was to identify potential areas for collecting seeds and to list promising native species for testing the recovery of riparian forests in the field-forest zone, Sao Francisco de Paula, RS. Four vegetation fragments (F1, F2, F4 and F5) were observed, which were performed at phytosociological and autoecological analysis of the studied species. The results proved that F1 and F2 showed seed collecting potential. In the restoration areas highlights Araucaria angustifolia , Sebastiania commersoniana, Eugenia uruguayensis, Myrciaria delicatula, Drimys brasiliensis, Blepharocalyx salicifolius, Ocotea pulchella, Cinnamomum amoenum, Styrax leprosus, Myrceugenia cucullata, Calyptranthes concinna, Myrcia palustris, Zanthoxylum rhoifolium, Roupala brasiliensis, Casearia decandra and Sebastiana brasiliensis as species with potential for restoration areas in the region with possibility of preserving the fragments where they occur.

TESTE DE SANIDADE E GERMINAÇÃO EM SEMENTES DE Cabralea canjerana (Vell.) Mart.

The current study aimed to identify pathogens, analyzing different seed treatments and substrates for the germination of Cabraleacanjerana and also to indicate instructions testing for laboratory test of the species germination. First, we assessed the moisture content and determined the thousand seed weight. In order to assess the pathogens associated with the seeds, health testing was performed at different seed treatments: T1 - Control; T2-Captan ® ; T3-Maxim ® ; T4-Sodium hypochlorite; andT5-AgrotrichPlus ® . The germination testwas performed based ona factorial designwithfive seed treatmentsand threesubstrates (on blotting paper, vermiculiteand sand). The seeds showedmoisture contentandthousand seed weight of41.2% and457.3g, respectively. The main fungi genera associated with Cabraleacanjerana seeds were: Penicillium spp., Fusarium spp., Cladosporium spp., Pestalotia spp. and Phomopsis spp..Theseed treatment withCaptan ® , Maxim ® andsodium hypochloritewas effectivein reducing the incidenceof Penicillium spp., but onlythe last twoshowedthe greatest potential forseed germination,regardless theused substrate. Treatment with Agrotrich Plus® had the lowest percentage of germination and increased incidence of Fusarium spp. Asepsis with 1% per 2’ sodium hypochlorite and seeding substrate over vermiculite is indicated for the germination tests of Cabraleacanjerana seeds and the first counting can be performed at the 19 th day and the final one at the 30 th day after the test.

Volumen de contenedores y dosis de fertilizante de liberación controlada en el crecimiento de plantas de Cabralea canjerana producidas en vivero

La velocidad con que las especies forestales nativas estan siendo presionadas por la accion antropica es mayor que el conocimiento silvicultural establecido para su conversion. Cabralea canjerana es una especie de alto valor comercial, de amplia distribucion desde America Central hasta America del Sur, pero aun depende de informaciones basicas para su produccion. Asi, el objetivo de este estudio fue evaluar el efecto de diferentes volumenes de contenedores y dosis de fertilizante de liberacion controlada-FLC en la produccion de mudas de Cabralea canjerana, en la fase de vivero. Los factores utilizados fueron volumen de contenedores (110 y 180 cm³) y dosis de FLC (0; 2,5; 5; 7,5; 10 y 12,5 g L-1 de sustrato). A los 210 dias, fueron evaluadas las variables: altura, diametro del cuello, masa seca aerea, radical y total, indice de calidad de Dickson, area foliar y largura del sistema radical. Para la produccion de plantas de Cabralea canjerana, se recomienda el uso de contenedores de 180 cm³ asociado con dosis de 11,5 g L-1 de FLC, combinacion reflejada en parametros morfologicos que pueden asegurar su sobrevivencia en campo. La hipotesis de que la utilizacion de contenedores de mayor volumen afecta positivamente el crecimiento, independiente de la dosis de fertilizacion utilizada, fue aceptada. Ademas, cabe recomendar la realizacion de estudios que comparen otras combinaciones de volumen de contenedores y dosis de FLC diferentes a las utilizadas en este trabajo, para aumentar la eficiencia de la produccion en vivero y garantizar la calidad de plantas de Cabralea canjerana.