Abstract Schizolobium parahyba, a fast-growing tree species from South America, was introduced to Indonesia as a potential timber source. This study aimed to evaluate the effects of heat-treatment at 150-200 ºC (4h) on the physical and mechanical properties of S. parahyba wood. The results show that weight loss (WL) increased from 2.62 ± 0.29% at 150 ºC to 9.22 ± 0.86% at 190 ºC, while anti-swelling efficiency (ASE) increased from 3.44 ± 0.78% at 150 ºC to 29.84 ± 5.40 % at 180 ºC. Compressive strength parallel to grain (CP) increased from 37.99 ± 6.49 MPa (control) to 46.50 ± 5.52 MPa at 170 ºC but declined at higher temperatures. Meanwhile, static bending strength and compressive strength perpendicular to grain (CT) decreased at ≥180 ºC. Overall, moderate heat-treatment at 170 and 180 ºC enhanced dimensional stability and improved CP, whereas higher temperatures (≥180 ºC) caused substantial weight and strength losses.

Abstract Given the strategic importance of commercial forest plantations of native species, this study aimed to select a tapering model to estimate the multiple products of Schizolobium parahyba var. amazonicum planting in integrated livestock-forestry systems in the Amazon and to identify the management regime with the highest production. The research was conducted in the state of Pará, comparing production as a function of variations in spacing and planting age. The Hradetzky, Schöepfer, and Max & Burkhart tapering models were evaluated, considering goodness-of-fit statistics and scatter plots. The Schöepfer model provided the most accurate estimate of tree cross-sectional volume. The management regime with 3.5 × 3.5 m spacing and 60 months promoted the highest assortment production (164 m3) and the lowest amount of residue (60 m3), indicating the largest spacing with the highest plant utilization.

Abstract The object of this research was to determine the sensitivity and bioindicator potential of the plant species Peltophorum dubium to glyphosate drift contamination by monitoring the effects of this herbicide in forests adjoining agricultural areas where it was applied. Sub dose glyphosate concentrations of 2%, 4%, 8%, 16%, and 32% of the recommended commercial dose of 1440 g ha-1 in simulated drift exposure tests revealed P. dubium intoxication to be very low (<4%) at doses lower than 115.2 g ha-1 and reached 40% when exposed to 460.8 g ha-1. In plants exposed to a dose of 460.8 g ha-1 there was a reduction in photosynthetic rate, transpiration, and stomatal conductance of 22.7%, 18.1%, and 33%, respectively, contrasted to the control dose. The morphophysiological responses of P. dubium indicate low sensitivity to glyphosate drift at lower exposure doses as well as the species’ survival capacity in areas contaminated by this herbicide.

Abstract The study proposes a sampling method, termed the probability proportional to the average geometric area of occupation, method in which a set of trees along a row is selected as the sampling unit with a probability proportional to the geometrical average area per tree - PPGA. An experiment was conducted inPinus taedastands under three management regimes to compare estimates of density, basal area, and wood volume per hectare obtained from the proposed method and those from a conventional forest inventory. Additionally, the results were evaluated through sampling simulations using census data fromEucalyptus sp.stands. Sample estimators were developed based on PPGA within the sampling unit. Since the mean geometrical average area per tree varies among randomly distributed sampling units, the method is classified as probability proportional to size sampling and referred to as probability proportional to the average geometric area of occupation. The probability proportional to the average geometric area of occupation method proved effective across various ages and management conditions in both pine and eucalyptus stands.

Abstract Human activities in the tropics, particularly large-scale deforestation, significantly contribute to rising greenhouse gas emissions. The carbon storage capacity of the Atlantic Forest, specifically in seasonal forests, needs to be better understood. Therefore, we analyzed the aboveground carbon stock (AGC) in a semideciduous seasonal forest (SSF) remnant in southeastern Minas Gerais through comprehensive vegetation inventory and wood density sampling. The 20 species that counted for half of the total basal area corresponded to a surprising AGC of 58.05 Mg.ha-1. The AGC found is similar to other studies in second-growth SSF, especially the ones with no recent record of human disturbance. However, besides the natural process of increasing AGC in forests over the years, long-term decreasing trends in other forest ecosystems in Brazil have already been reported. Future long-term studies are crucial to understanding how the forest carbon stock will respond to the ongoing environmental and climate change scenario.

Abstract The study evaluated the use of the nucleation method to plant native species on the Cagarras Islands (RJ), affected by invasive grasses such as crabgrass. Four native species (two pioneers and two late-successional species) were tested together with Muellera virgilioides (Vogel) M.J.Silva & A.M.G.Azevedo, which had been previously planted. After 18 months of monitoring, Schinus terebinthifolia Raddi was the most resistant species, with the highest survival and growth rates. Monteverdia obtusifolia Mart. (Biral) and Allopyllus puberullus (Cambess.) Radlk., on the other hand, showed poor performance. The study concludes that the method is viable, but in demanding environments it is better to use species with more vigorous growth to ensure restoration success.

RESUMO Neste artigo objetiva-se apresentar contribuições do paradigma indiciário para a análise de narrativas em pesquisas do campo da Educação. O paradigma indiciário, estudado e utilizado pelo historiador italiano Carlo Ginzburg, possibilita interpretar a realidade, algumas vezes opaca, em busca de características menos vistosas, de indícios que permitam decifrá-la e compreendê-la. Porém, constatou-se que há uma utilização restrita do paradigma indiciário no Brasil, e por esse motivo surgiram perguntas: que contribuições o paradigma indiciário traz para a análise de narrativas? E que elementos considerar, à procura de indícios? Esta pesquisa é de cunho teórico e constitui-se como um recorte da tese de doutorado do primeiro autor.

Abstract This study aimed to evaluate the physiological changes in pindo palm (Butia capitata) seeds, a native fruit species of the Brazilian Cerrado, over time under different storage conditions. Pyrenes (endocarp+seed) were stored on the sand under shade and refrigeration conditions. The physiological quality of seeds and embryos (via in vitro culture) was evaluated over time. Moisture content decreased during storage until stabilization, while germination, germination speed index (GSI), and operculum resistance remained stable up to 90 days, with a significant decline at 120 and 150 days. Conversely, lipid peroxidation, measured by malondialdehyde (MDA) content, and electrical conductivity (EC) increased over time, especially after 90 days. Refrigeration promoted greater embryo elongation, but sheath and root emergence were reduced. Storage reduces seed dormancy in B. capitata but also decreases viability and vigor.