Resumo em Inglês:

Abstract The aimed to evaluate the properties of MDP and HDP panels, produced with pure Populus deltoides or in a mixture with Pinus taeda, together with urea-formaldehyde resin. The density and chemical properties of this wood with 8 and 12 years of age were determined, which were used for the production of panels with nominal density of 0.65 and 0.90 g.cm-3. Water absorption and thickness swelling tests were performed after 2 and 24 hours of immersion, as well as static bending and perpendicular tensile. Populus deltoides wood was classified as low-density in both ages and presented chemical properties similar to Pinus taeda. Mechanical properties obtained for the panels produced reached the minimum requirements values established by the standards NBR 14810-2 and ANSI A208.1, demonstrating the potential use of wood species for the production of MDP and HDP panels, at both ages studied and used pure or mixed with Pinus taeda wood.

Resumo em Inglês:

Abstract The objective of this study was to evaluate the capacity as bioindicators of litter arthropodofauna in pasture restoration in the Atlantic Forest Biome. Areas of native forest under natural regeneration, and pastures treated with different ecological restoration techniques were evaluated, with pitfall traps. The sampling period was from April/2017 to October/2018, bimonthly. Families Ptiliidae, Staphylinidae, and Leiodidae, species Pheidole cf. sarcina (Formicidae) and Mastigoceras sp. 1 and Szeptyckitheca sp. 1 (Collembola) were indicators of well-conserved areas, whereas families Cicadellidae and Delphacidae, Formicidae species Wasmannia auropunctata (Roger, 1863) and Camponotus melanoticus Emery, 1894 were indicators of degraded areas. From the springtail community, species richness is a metric that can be used as a bioindicator. It was observed that all taxonomic identification levels allowed for the differentiation of the environmental conditions of the sampling areas, with less specific identification levels, such as family, possibly indicating changes in areas under the restoration process.

Resumo em Inglês:

Abstract The objective of this study was to evaluate the effect of the inoculation with nitrogen-fixing bacteria (NFB) and arbuscular mycorrhizal fungi (AMF) and substrates in the production of Samanea saman (rain tree) seedlings. Three substrates and three inoculation treatments were combined in a randomized block design with six repetitions. The Sewage Sludge substrate favored symbiosis with AMF (promoting twelve times more sporulation), while the Commercial substrate favored symbiosis with NFB (promoting 70% more nodulation). The Sewage Sludge substrate provided the best development of S. saman seedlings, as it promoted higher biomass compared to the Commercial and Standard substrates (14% and 150% respectively). The most significant response to inoculation occurred in the seedlings produced in the Standard substrate, in which the inoculated seedlings had higher biomass than those that received fertilization and those that received neither inoculation nor fertilization (20% and 50% respectively).

Resumo em Inglês:

Abstract This study aimed to evaluate the influence of nutrient omission on the growth and phytomass production of three tree species native to the Caatinga biome cultivated in degraded Chromic Luvisol samples, under greenhouse conditions. The experiments were conducted from april to june 2015. Three experiments were set up corresponding to three tree species [Myracrodruon urundeuva (Allemão), Caesalpinia ferrea (Mart. ex Tul.), and Amburana cearensis (AC Smith)], in a completely randomized design with eight treatments referring to the addition or not of nutrients to the soil and four replications. The results revealed that Fe and Zn supply was essential for the initial establishment of M. urundeuva and A. cearensis in Chromic Luvisols. For C. ferrea, which has a higher growth rate, fertilization with N, P, and S sources is necessary in addition to Fe and Zn in order to increase its establishment potential in these areas.

Resumo em Inglês:

Abstract Thus, the objective of the research was to evaluate the initial growth and development of seedlings under Platymiscium floribundum at different levels of luminosity. The experimental design was completely randomized in a 4 x 10 factorial scheme (four levels of shade: full sun, 50%, 65% and 80% with ten replications per treatment. The height, number of leaves was evaluated monthly. At the end of the experiment at 180 days, leaf dry matter, stems, roots, and dry matter. In addition, measurements were made of the variables related to gas exchange and plant anatomy of leaves. The results obtained were observed higher growth and developed satisfactorily at full sun), without presenting morphological changes. For the gas exchange did not differ statistically. It is concluded that the initial growth of P. floribundum seedlings was superior in the light level in full sun, providing favorable conditions for their development.

Resumo em Inglês:

Abstract This study was conducted to assess the physicochemical characteristics of urban forest soil contaminated by copper and the dynamics of macro- and micronutrients uptake by Schinus terebinthifolia and Eugenia uniflora seedlings. The seedlings received 0 (control), 60, 120, 180 or 240 mg Cu kg-1 soil applied to urban forest soil within São Paulo City, Brazil. Our results showed that K was reduced in Cu-contaminated soil used for S. terebinthifolia cultivation and that organic matter was higher in Cu- contaminated soil used for E. uniflora cultivation. Other physicochemical properties of soil remained unaltered. S. terebinthifolia presented nutritional imbalances in N, K and Mg on leaves, while E. uniflora presented nutritional imbalances in K on leaves and in S on roots. It can be concluded that copper contamination can negatively affect chemical and nutritional characteristics of urban forest soil, as well as the nutritional dynamics of S. terebinthifolia and E. uniflora.

Resumo em Inglês:

Abstract Fertilization in the seedling production phase is essential to form quality seedlings. Thus, the aim of this study was to evaluate the appropriate doses of two slow-release fertilizers (SRF1 and SRF2) and their nutrient leaching behavior. For this, five different doses of fertilizers were tested. 0, 2, 4, 6, and 8 kg m-³. The height, stem diameter, leaf area, shoot dry mass, root system dry mass, total dry mass, and the Dickson Quality Index were measured, and for each variable the maximum dose of technical efficiency was determined. In addition, was evaluated the electrical conductivity, over time, for determinate the leaching of the nutrients. All the variables had satisfactory growth for field planting. However, the SRF2 resulted in greater seedling growth and also experienced less nutrient loss by leaching, when compared with the SRF1. The both fertilizers could be utilized to seedlings production, at doses of 4.00 kg m-³.

Resumo em Inglês:

Abstract This study aimed to evaluate the phytochemical features of medicinal species of the Asteraceae family, their mineral elements, antioxidants, vitamins, and amino acids. The species studied included common yarrow (Achillea millefolium L.), common chicory (Cichorium intybus L.), and German chamomile (Chamomilla recutita (L.) Rauschert) collected in the Ile Alatau Mountain (Trans-Ili Alatau), Kazakhstan. The plants were harvested in July 2019-July 2020 during their flowering. The article’s scientific novelty lies in the conceptual research of phytochemical and morphological features of medicinal species with a maximum content of biologically active substances and high antioxidant activity, which can be a basis for creating innovative functional food products enriched with natural antioxidants. The article describes a new idea to display a very high concentration and diversity of vitamins (8 types), mineral elements (8 types), antioxidants, and amino acids (13 types) in the flowers of C. intybus L., Ch. recutita L., A. millefolium L.

Resumo em Inglês:

Abstract This work aimed to evaluate the monthly growth rate of 100 trees spread in different diametric classes and ecological groups of a secondary forest in the municipality of Igarapé-Açu, Pará, Brazil. These were selected randomly from 30 permanent plots and classified into 5 diametrical classes and separated into two ecological groups: Pioneers and Non-Pioneers. The monthly periodic increment (MPI) in diameter was measured for 11 months by means of diametric bands using digital calipers. The MPI means were evaluated by an analysis of variance (ANOVA) and Tukey’s mean comparison test. Individuals from both ecological groups had similar increments in the DBH IV diameter class and different in the others. There were mean increments in the diametric classes that did not differ within the ecological groups. The trees analyzed differed in the diametric growth rate according to the diametric classes, ecological groups and the month of analysis.

Resumo em Inglês:

Abstract Wood quality is related to the characteristics and properties of this material. Understanding the factors that can impact the wood formation is fundamental in the indications for use. The aim of this study was to evaluate the influence of different planting densities on the wood quality and the radial profile on some physical and anatomical characteristics of young trees of Tectona grandis. Nine trees were evaluated in three planting densities: 6 x 2 m; 5 x 2 m; and 4 x 2 m. All trees were subjected to analysis of acoustic tomography, X-ray densitometry, and fiber characterization. Multivariate associations between the variables of interest were evaluated according to the planting spacing and the radial profile by principal component analysis. The results indicated that the wood characteristics of young teak trees are influenced, mainly, by the radial variation (pith-bark).

Resumo em Inglês:

Abstract The correlation between biological and ecological parameters is essential for the sustainable use of species. This study aimed to assess the relationship between phenological intensity and tannin production in Sideroxylon obtusifolium (Roem. & Schult.) T.D.Penn. in environments with different precipitation regimes. The tannin production and phenological characterization were assessed through the intensity and synchrony of leaves, flower buds, flowers, and fruits in specimens from two microregions of Paraíba, northeastern Brazil. The specimens in the municipality of Sumé were not synchronous and fruiting is the least synchronous phenophase, with an index of only 0.17. The specimens in São João do Cariri had synchronization of 0.77, 0.82, and 0.92 for flower bud, flowering, and fruiting phenophases, respectively. The correlation and factorial clustering showed that fruiting has a correlation of -0.75 with the production of tannins, suggesting that low intensity of annual fruiting is necessary for higher tannin production.

Resumo em Inglês:

Abstract The payment value for the ecosystem service of carbon sequestration and storage in forests and agroforestry systems with cacao (AFS-cacao) from the sub-basin of river Munguidó, Quibdó, Colombia was estimated. The productive activities of highest economic importance (cane, pineapple, plantain, cassava, AFS-cacao, and timber harvesting) were selected, and their financial profit was assessed: net present value (NPV), cost-benefit ratio (B/C), and the internal rate of return (IRR). The payment value for the service was estimated considering the profitability of productive activities and carbon sequestration rate. Minimum and maximum values to pay for reduction of carbon emissions in primary forests, and for carbon sequestration in secondary forests and AFS-cacao are between 4 and 27; 5 and 37; and 9 and 63 U$/Mg CO2e, respectively.

Resumo em Inglês:

Abstract This study aimed to evaluate decomposition and release of C and of N from the litter of forest Caatinga species in the humification phase, as well as to estimate the residence time of C and N. Litter decomposition of the species was evaluated in 2014/2015 in the municipality of Floresta, Pernambuco, Brazil, using a method of the litter bags at 270; 300; 330; and 360 day. Litter from species of the Fabaceae family presented different decomposition groups, suggesting that decomposition was more influenced by the C/N ratio than N concentration only. The N release was 6.25% greater than the release of C. C will remain in the litter for more time, while N will be almost totally released in approximately 1.14 years. The species litter decomposition were shared, suggesting that the nutrients cycling is fundamental in the preservation of the Caatinga, mainly due to the longer residence time of C.

Resumo em Inglês:

Abstract We present a case study focusing on the influence of inflorescence position on the relationships between foliar and reproductive phases, focusing on three Leguminoseae tree species in the Chapada Diamantina, Brazil. Both Senna multijuga and Copaifera langsdorffii produce terminal panicles and showed vegetative and reproductive phenophases that were correlated but segregated in time, with the marked concentration of reproductive data. The presence of axillary inflorescences on Inga cayennensis enables the simultaneous production of both flowers and leaves, without the segregation or the correlation of those phases, with a uniform distribution of reproductive data. This study encourages further investigations regarding the effects of inflorescence position on plant phenology.