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Original Manuscript

Seed seedlings development of different Eucalyptus and Corymbia species purposing forestry advancements in the Cerrado

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Abstract


The production of quality seedlings has a direct impact on the productivity of a forestry establishment. Knowing the specifics of each specie and its adaptation to the edaphoclimatic conditions of a given region is essential for the success of a forest plantation. The production of seedlings of Eucalyptus spp. and Corymbia spp. presented in this work comes from the sexual propagation, by seeds. The study carried out the comparison between 13 species of Eucalyptus spp. and Corymbia spp., verifying the quality of the seed lots, via in vitro germination test and by sowing in tubes. The biometric measurements applied in this study were total seedling height, neck diameter and seedling vigor, three measurements of seedlings were carried out in plastic bags and the data were transferred to the R software to be analyzed, applying split-plot analysis of variance (ANOVA) and means of variables. The germination percentage was higher in tubes than the results obtained in vitro, with emphasis on the results of the species Eucalyptus dunnii, Corymbia citriodora, Eucalyptus longirostrata and Corymbia maculata, which reached 100% germination in tubes and these are also the species that stood out in biometric measurements, with emphasis on the results of the species Eucalyptus dunnii, Corymbia citriodora and Eucalyptus longirostrata. The study aimed to generate viable, healthy and vigorous seedlings from seminal propagules of Eucalyptus spp. and Corymbia spp., to compose, at the end of the experiment, which has the potential to extend, beyond this study, the Eucalyptus Garden at Escola de Agronomia - EA/UFG), Goiânia, GO, Brazil, collaborating with the practical classes that will be able to use the space to present to the students the features inherent to the species.

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Review Manuscript

Improve for better use: exploitation potential, advances and gaps in the conservation and breeding of Hancornia speciosa – A review

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Abstract


Amidst the flora richness of the Brazilian Cerrado, a group of fruit species widely consumed by local communities stands out. Hancornia speciosa Gomes (mangaba tree or mangabeira), a native fruit tree, arouses the interest of the agro-industrial sector, but has been suffering from the advances of anthropogenic activities in its areas of natural occurrence. This review aims to present the main aspects related to the biology, ecology and exploitation potential of H. speciosa, as well as the advances and gaps in efforts for its conservation and breeding. The mangaba tree is found with greater incidence in areas covered by the Cerrado biome, in addition to the coastal plateaus and coastal lowlands of the Northeast of Brazil. Older botanical classifications suggest the existence of six botanical varieties for the species, with the exchange of pollen grains between any of them potentially viable. In 2020, Brazil produced the equivalent of 1933 tons of mangaba, which can be consumed fresh or processed and has a high nutritional value and important pharmacological properties. Accessions of H. speciosa are safeguarded ex situ, in vivo, by research institutions and public universities in the North, Northeast and Midwest regions. Although there are no commercial cultivars so far, some germplasm collections have already managed to select candidates for parents with emphasis on productivity and fruit quality. The food and pharmacological potential of H. speciosa here described and the continuous exploration and degradation of its natural habitats make efforts related to its conservation and breeding pertinent. Such activities will allow the maintenance of its genetic resources, as well as the expansion of its production and consumption chains beyond the local scale.

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Original Manuscript

Forest structural analysis of a seasonal semideciduous area in the northeast Brazil

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Abstract


As a prominent aspect of forest fragmentation, arboreal individuals’ diameter and height structure are impaired. The forest structure allows identifying each population’s behavior and habit and collects information on growth and survival that assists in establishing and managing conservation strategies. This work aimed to perform the diametric and height distribution of an adult tree community and the five highlighted species of the area located in the Northeast Brazil. We implanted 20 permanent plots with 250 m² and measured all arboreal individuals sampled with a circumference at breast height (CBH) ≥ 15 cm in addition to heights. The tree community presented a graph of the negative exponential type in the diametric distribution and a higher concentration in the 6-8 m in height median class, a typical pattern found in remnants of Atlantic Forest. Guapira nitida, Manilkara sp., Byrsonima crassifolia, and Sloanea obtusifolia presented the same pattern as the community due to their ecological attributes as succession group and dispersion syndrome. These data are compatible with the ecological succession process of Brazilian’s northeast Seasonal Semideciduous Forest. Moreover, the species Buchenavia tetraphylla diverged because of its ecological characteristics that do not allow new individuals to develop in the study area. The fragment was classified according to CONAMA Resolution n°. 31 as secondary vegetation in the medium regeneration stage. The analyzed remnant is still in the regeneration process, resulting from the disturbances caused. The most important species of the fragment still present young individuals, representing young communities with potential for establishment.

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Original Manuscript

Efficiency and productivity of skidder dragging full-trees of Eucalyptus sp.

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Abstract


The development of activities in the forestry sector is constantly evolving. The constant search for improvements in the production system in order to increase production and reduce costs are, therefore, necessary to maintain the growth of forestry. The forest harvesting stage corresponds to a large part of the financial amount spent on the activity and, therefore, it becomes the target of constant studies aiming at its improvement and evolution. The objective of this study is to carry out a technical analysis of the operation of a forest machine skidder operating in the drag of a eucalypts stand in the whole tree system. The technical analysis encompasses factors such as the study of times and movements, operational efficiency and productivity, evaluating the performance of the machinery for three different drag branch distances. In the study of times and movements, the operations “travel without load” and “travel with load” were the operations that demanded the longest total cycle time. The operational efficiency of the machinery approached 90% and the productivity of the skidder decreased according to the increase in the distance from the skidding branch, being in the order of 19.36 m³. hˉ¹ for the 100-meter skid road, 14.01 m³. hˉ¹ for the 200-meter skid road and 8.35 m³. hˉ¹ for the 300-meter skid road.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International (CC-BY). Which permits: share, copy and redistribute the material in any medium or format; and adapt, remix, transform, and create from the material for any purpose, even commercial. Once you give proper credit, provide a link to the license and/or indicate if changes have been made. You may do it under any reasonable circumstance, but in no way that suggests that the licensor supports you or your use.

Original Manuscript

Hypsometric equation adjustments for multi species clonal plantations of Eucalyptus in the Cerrado Goiano

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Abstract


Eucalyptus forests has an important role in the national economy since the wood generated by this activity supplies most of the forest-based industries and, also, by its contribution to reducing the pressure of exploitation in native forests. In recent years, commercial eucalyptus plantations have expanded to new areas, such as the central regions of Braziland, as a result, there is a lack of multidisciplinary studies on clones adapted to these environments. This way this study aimed to adjust 18 traditional hypsometric models and 2 proposed for a six-year-old eucalyptus multispecies clonal test in the municipality of Catalão, Goiás. For the execution of this work, a total of 80 representative trees were randomly selected to adjusted 20 hypsometric models (arithmetic and logarithmic). To select the best models, the regression significance, the coefficient of determination (R²), the correlation coefficient (r), the standard error of percent estimate (Syx%), and the bias through the root-mean-square error were verified (RMSE) and the graphical analysis of the residuals. Most of the evaluated models presented high values of r and R² and low error and bias rates (RMSE). The adjusted models Hyperbolic (a), Naslund (b) and Prodan (c), DBH²/H =1.8142+0.0997*DBH+0.0261*DBH²; and DBH²/(H − 1.3)=2.2342+0.0870*DBH+0.0274*DBH², were the most appropriate for the estimation of the total height from the diametric data of multispecies clonal plantations in the Cerrado of Goiás, in regions with Cerradão phytophysionomy.

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Original Manuscript

Influence of mechanical scarification and single angle germination in seeds of Schizolobium parahyba

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Abstract


The seeds of Guapuruvu inated tegumentary dormancy prevented the entrance of water, consequently, not occurring their germination, next to the aforementioned situation, to the work as having been listed different dormancy techniques in the formation phase of Guapuruvu in the experimental nursery of the Faculty of Social Sciences and Agrárias de Itapeva - FAIT. The new treatments were the scarification techniques for the influence of the seed sowing direction, which can be recognized as the best planting direction and the horizontal water gain as the highest emergence rates, the best treatment for T2 - mechanical scarification Opposite side of the horizontal sowing and sowing with 90% germination. The experimental work was in a completely randomized design (DIC), each day containing 15 seeds with 3 replicates each, the results were submitted to a statistical analysis by the Tukey test at 5% of the probability of error.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International (CC-BY). Which permits: share, copy and redistribute the material in any medium or format; and adapt, remix, transform, and create from the material for any purpose, even commercial. Once you give proper credit, provide a link to the license and/or indicate if changes have been made. You may do it under any reasonable circumstance, but in no way that suggests that the licensor supports you or your use.