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RESUMOA massa específi ca básica (ME b

This study aimed to estimate biomass and organic carbon in stands of Pinus taeda L. at different ages (14, 16, 19, 21, 22, 23 and 32 years) and located in the municipality of General Carneiro (PR). In order to estimate biomass and organic carbon in different tree components (needles, live branches, dead branches, bark and stem wood), the destructive quantification method was used in which seven trees from each age category were randomly sampled across the stand. Stocks of biomass and organic carbon were found to vary between the different age categories, mainly as a result of existing dissimilarities between ages in association with forest management practices such as thinning, pruning and tree density per hectare.Key words: Nonnative forests, sustainability, forest stand. (14, 16, 19, 21, 22, 23 BIOMASSA E CARBONO ORGÂNICO ACIMA DO SOLO EM PLANTIOS DE Pinus taeda L. RESUMO: Objetivou-se estimar a biomassa e carbono orgânico em plantios de Pinus taeda L. com diferentes idades

Este trabalho tem como objetivo avaliar o efeito do manejo florestal em regime sustentado sobre a estrutura diamétrica da comunidade florestal e sobre as quatro espécies com maior frequência, em um fragmento florestal caracterizado como ecótono das florestas Ombrófila Mista e Estacional Decidual. O estudo foi realizado em uma área de 50 ha, localizada no noroeste do estado do Rio Grande do Sul - BR, centrada nas seguintes coordenadas 27° 36' 49,60" Sul e 53° 29' 23,05" Oeste. Dois inventários foram realizados, (i) em 1993, no qual foram alocadas 25 parcelas (20 m x 50 m) aleatoriamente, e (ii) em 2013, no qual foram instaladas 31 parcelas (20 m x 50 m) sistematicamente. Todos as árvores acima de 10 cm de diâmetro à altura do peito foram mensuradas e identificadas a nível de espécie. Os resultados demonstraram que apenas a função Exponencial 2P apresentou aderência nos dois anos de mensuração para a comunidade florestal. Para as espécies Cedrela fissilis Vell. e Campomanesia xanthocarpa O. Berg a distribuição SB Johnson apresentou a melhor aderência, já para a Araucaria angustifolia (Bertol.) Kuntze foi a distribuição Beta e para a Sebastiania commersoniana (Baill.) L.B. Sm. e Downs a distribuição LogNormal 3P, considerando os dois inventários. O manejo florestal em regime sustentado apresentou benefícios para algumas espécies como a Campomanesia xanthocarpa e Sebastiania commersoniana, que retomaram suas regenerações em fluxo contínuo, já as espécies Araucaria angustifolia e Cedrela fissilis não apresentaram tal retomada.

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Knowledge of aboveground biomass stock in Seasonal Deciduous Forests is imperative for the implementation of mechanisms to reduce emissions from deforestation, forest degradation and land reclamation. The present study analyzed the vertical distribution of aboveground biomasses in a Seasonal Deciduous Forest in Rio Grande do Sul state, Brazil. Seven 12 x 12 m plots were established, and all trees inside the plots were weighed directly in the field. Subplots of 5 x 5 m and 1 x 1 m were marked within the main plots to quantify the remaining vegetation. Average dry aboveground biomass was 316.5 Mg ha -1 , trees with diameter at breast height (DBH) greater than 10 cm accounting for over 89% of this biomass. Therefore, biomass determination of large trees deserves special attention, since they represent a large part of the biomass of this forest ecosystem. Biomass of plants taller than 1.3 m and with diameter at breast height < 5 cm was 6.9 Mg ha -1 , and that of plants lower than 1.3 m was 1.5 Mg ha -1 . Average litter mass was 15.6 Mg ha -1 . Trees of large diameters must be analyzed very carefully for quantify the biomass and carbon in the forests, because few individuals might represent a large part of the biomass of a forest ecosystem. , árvores com o diâmetro à altura do peito (DAP) maior 10 cm representando mais de 89% dessa biomassa. Portanto, a determinação da biomassa das árvores grandes merece atenção especial, já que elas representam uma grande parte da biomassa deste ecossistema florestal. A biomassa das plantas com altura superior a 1,3 m e DAP < 5 cm foi de 6,9 Mg ha . A biomassa média da serapilheira foi de 15,6 Mg ha -1 . Árvores de grandes diâmetros devem ser analisadas com muito cuidado para quantificar a biomassa e o carbono nas florestas, pois poucos indivíduos podem representar grande parte da biomassa de um ecossistema florestal.

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6 RESUMO ABSTRACTA Cordia americana (Linnaeus) Cordia americana (Linnaeus) Gottshling & J.E. Mill is used in forest restoration to recover degraded areas and riparian forest, therefore, it is important to know the quality of seedlings produced in nurseries. Thus, the present study aims to predict the Dickson quality index in Cordia americana seedlings under different arrangement conditions. The design was conducted in a protected environment in a randomized block design, in which two sizes (90 and 170 cm³) of the tube and two densities were tested, totaling four combinations. The following morphological parameters were evaluated: plant height, stem diameter, leaf phytomass, stem and root, leaf area, and Dickson quality index. Plant growth was influenced significantly by the volume of the tube and density of plants throughout the evaluation period of the experiment. The container with 170 cm³ volume and 50% density was the highest IQD produced plants with best quality.GottshlingPALAVRAS-CHAVE: Adensamento de plantas, Área foliar, Guajuvira, Índice de Dickson.