Non-timber forest products (NTFPs) are a consolidated source of income and acquisition of inputs from forest environments. Therefore, the objective of this work was to carry out a collection of publications on NTFPs in Brazil, until 2019, available in the Scopus database, presenting a bibliometric review and the state of the art of this theme from the evaluation of these publications, discussing the challenges of Brazilian legislation on NTFPs. After screening the articles of interest, 196 documents were evaluated, in which they were observed institutions and authors, analyzing networks of citations and terms used, areas of forest sciences and sciences that encompass the most explored biomes and the most studied species. The results showed that the concern to research on NTFPs in Brazil began in the 1990s, with an increase in the number of publications over the years. Besides that, the research on NTFPs is multidisciplinary, with emphasis on the areas of Agricultural and Biological Sciences and Environmental Science. For better regulation of the process of exploration and management of NTFPs in Brazil, the need to create specific legislation that takes into account factors such as the phytogeographic domain the explored area, producing species, and the products and co-products obtained was observed.

This research aimed to determine the concentration of tannins in the bark and in the branches of ten species of Caatinga occurrence. The Folin-Denis colorimetric method was used to determine the phenol content and the tannins are precipitated using a protein. The tannin content was obtained by the difference between the supernatant and the non-tannic phenol content. The data were subjected to the Shapiro-Wilk normality’s test and after, to Analysis of Variance using a 2x10 factorial design and Turkey’s test was used to detect differences. For bark sample, the species Parapiptadenia zehntneri, Parapiptadenia rigida and Libidibia ferrea presented the three highest percentages among the studied species, being 10.84%, 10.74% and 10.27%, respectively. For branch sample, Aspidosperma pyrifolium presented the highest percentage of tannins among the ten species, with 9.15% of these substances. It is possible to suggest the use of other parts of the tree to extract the tannins, such as the branches and their bark, offering an alternative for the extraction that is usually made from the main trunk and providing sustainability to the Caatinga.

This study aimed to characterize the wood energetically and evaluate the quality of the charcoal produced from different Eucalyptus sp. clones, identifying the most suitable. The basic density of wood and was determined, then, the proximate chemical analysis and the calorific value were determined from charcoal. The annual energy production was estimated by the relationship between the wood production of these Eucalyptus clones and the information obtained in the previous steps. The experiment was conducted following a completely randomized design. The data were submitted to the homogeneity test of Cochran's variances when they presented significant differences, the means were compared by Tukey (p = 5%). The properties of wood and charcoal were correlated by Pearson's correlation analysis (p = 0.05). According to the results, the genetic material didn't influence the chemical composition of charcoal, however, the clones of the E. urophylla × E. terticornis hybrids -C101 and E. urophylla -C39 showed better results concerning the basic density of the wood. In addition, the C101 hybrid showed the greatest wood production, as well as the mass of charcoal to be produced. Due to these characteristics, this hybrid presented a greater potential for annual energy production.

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