A Sabiá (Mimosa caesalpiniaefolia Benth.) possui a característica ecológica de se associar simbioticamente a bactérias fixadoras de Nitrogênio e fungos micorrízicos arbusculares. Tais associações são utilizadas como ferramentas biológicas capazes de minimizar o uso de fertilizantes químicos e beneficiar o desenvolvimento da planta em ambientes com déficit nutricional. Este trabalho teve como objetivo avaliar o crescimento da Sabiá em resposta à inoculação com rizóbio e fungos micorrízicos arbusculares, estabelecer curvas de crescimento em altura e diâmetro do colo, determinar os conteúdos de N e P na parte aérea das plantas e avaliar a sobrevivência das plantas em campo. A estirpe de rizóbio utilizada foi a BR3405, os fungos micorrízicos arbusculares utilizados foram Glomus clarum e Gigaspora margarita. A inoculação conjunta de Glomus clarum + Gigaspora margarita + BR3405 e a inoculação com o isolado Gigaspora margarita promoveram os melhores valores para as variáveis estudadas (altura, diâmetro do colo, conteúdo de N e P), sendo este último o tratamento mais indicado para o cultivo da Sabiá nas condições em estudo. As plantas apresentaram 100 % de sobrevivência, independente do tratamento utilizado. Não foi constatada diferença estatística para os conteúdos de N e P na parte aérea da Sabiá, porém, foi observado maior crescimento das plantas com o uso dos simbiontes.

RESUMO.O objetivo deste trabalho, desenvolvido em casa-de-vegetação, foi estudar a eficiência de utilização de fósforo e a eficiência radicular de mudas de jacarandá-da-bahia (Dalbergia nigra (Vell.) Fr. Allem.), a partir de dados de peso de matéria seca e de conteúdo de fósforo obtidos na parte aérea e no sistema radicular, avaliando os efeitos de fertilização do solo com fósforo (P) e de fungos micorrízicos arbusculares (MA) em mudas, cultivadas em substrato constituído pela mistura de solo, areia e vermiculita, na proporção volumétrica de 1:1:1. Os tratamentos consistiram em cinco doses de P (0, 50, 100, 150 e 200 mg dm -3 ) adicionadas ao solo via fonte solúvel, na ausência e presença dos fungos MA, Gigaspora margarita e Glomus fasciculatum. As avaliações foram realizadas aos 45, 90 e 135 dias após inoculação. Concluiu-se que, independente da dose de P adicionada, as mudas de jacarandá-da-bahia, inoculadas com os fungos MA, G. margarita e G. fasciculatum, quando comparadas àquelas não-inoculadas, apresentaram maior peso de matéria seca, maior conteúdo de P e maior eficiência de utilização de P, tanto na parte aérea quanto no sistema radicular, bem como uma maior eficiência radicular, ou seja, uma maior capacidade do sistema radicular para absorver e translocar o P para a parte aérea.Palavras-chave: espécies florestais, adubação, micorriza.ABSTRACT. Mycorrhizal efficiency in seedlings production of jacarandá-da-bahia cropped at different phosphorus levels. The aim of this work, carried out in greenhouse, was to study the phosphorus utilization efficiency and the root efficiency of jacaranda-dabahia (Dalbergia nigra (Vell.) Fr. Allem.) seedlings from data of phosphorus content obtained on shoot and on root system, evaluating the effects of soil fertilization with phosphorus (P) and arbuscular mycorrhizal (AM) fungi. Seedlings were grown on a substratum composed by soil, sand and vermiculite, at the rate of 1:1:1. The treatments consisted in five P doses (0, 50, 100, 150 and 200 mg dm -3 ), applied as a soluble source, on absence and presence of the AM fungi, Gigaspora margarita and Glomus fasciculatum. Evaluations were carried out at 45, 90 and 135 days after inoculation. Results showed that independent of added phosphorus doses, the jacaranda-da-bahia seedlings inoculated with AM fungi, G. margarita and G. fasciculatum, when compared with the non-inoculated seedlings, exhibited higher dry matter weight, P content and P utilization efficiency on the shoot and in the root system as well as higher root efficiency, that is to say, higher capacity of the root system to uptake P and to transfer it to the soot.

The objective of this study was to evaluate the dynamics of natural regeneration in an urban forest fragment in Recife -PE. Ten plots of 5 m x 5 m were installed, the individuals with height (H) ≥ 1 m and the circumference at breast height (CBH) ≤ 15 cm were measured in 2010 and 2017. The floristic composition, diversity, phytosociological parameters and natural regeneration by height and total classes were evaluated. The individuals were distributed in height classes, where: C1 = H ≥ 1.0 up to 2.0 m; C2 = H> 2.1 to 3.0 m; C3 = H> 3.0 m and CAP <15 cm. The families with the highest number of individuals in both years were: Moraceae, Burseraceae, Euphorbiaceae and Fabaceae. Together, these families accounted for 74.57% of the total number of individuals in 2010 and 73.40% in 2017. The predominance of individuals in the first class was observed, followed by the second and third. The species with the highest Total Natural Regeneration (TNR) were: Artocarpus heterophyllus, Helicostylis tomentosa, Protium giganteum, Protium heptaphyllum, Brosimum guianense and Mabea occidentalis, which together corresponded to a TNR of 60.09% in 2010 and Original Research Article

This study aimed to define a methodology that, when combined with temperature, can overcome the dormancy and also to determine the adequate substrate and light conditions for germination of Colubrina glandulosa Perkins, contributing to seed analysis and restoration projects. In the experiment of dormancy and temperature, seeds were immersed in sulfuric acid for 30, 60, 90, 120 and 150 minutes and set to germinate at temperatures of 20-30 °C, 25 °C and 30 °C. The used substrates were sand, vermiculite, Tropstrato ® substrate, coconut powder, blotting paper and paper towel. As for the light supplied, the seeds were subjected to four luminosity regimes: white light, far-red light, red light and light absence. Temperatures of 20-30 °C and 30 °C achieved better results, with exposure in sulfuric acid for 120 and 150 minutes. The substrates sand and vermiculite were the most suitable. The species germinated in all light regimes treatments used.

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Landscape change with the transposition of the São Francisco River, in the Domain Caatinga, Pernambuco.The objective of this study was to evaluate the dynamics of land use and cover and the landscape structure, as well as the landscape structure, of the Directly Affected Area by Integration Project of the São Francisco River with the Northeastern Hydrographic Basins, from the East Axis portion located in the State of Pernambuco, Brazil. For this purpose, TM / Landsat 5 and OLI / Landsat 8 images were used, referring to the years 1998, 2008 and 2018, periods before, during and after the transposition, respectively. The land use and land cover classes used in this analysis were savanna-steppe, savanna-steppe, anthropized and / or uncovered area, water resources and agricultural area. Image processing and classification were performed using the QGIS software. Also, studies related to the landscape structure were carried out, using different types of metrics, processed in the Patch Analyst tool, an extension of ArcGIS 10.5. As a result of the analysis of the 20 years, it was obtained that the savanna-steppe vegetation cover showed a 13.86% reduction. However, there were additions in the areas of ciliary savanna, water resources, agricultural area and anthropized area in 1.93%, 0.11%, 0.31% and 11.51%, respectively. Furthermore, there was an increase in forest fragmentation, which corroborated with the results regarding for the core area metrics, which show that there has been a reduction in the size of the fragments and a trend towards the loss of the core areas, due to the edge effect.

RESUMO:A sabiazeiro (Mimosa caesalpiniifolia Benth.) é uma espécie indicada para programas de recuperação de áreas degradadas, por apresentar característica de associação com rizóbio e fungo micorrízico arbuscular, o que beneficia seu desenvolvimento e proporciona melhoria na qualidade do solo. O presente trabalho foi desenvolvido visando avaliar o desenvolvimento da Sabiazeiro inoculada com β-rizóbio (Burkholderia sabiae -BR3405) e com fungo micorrízico arbuscular (FMA-Glomus etunicatum). As sementes foram inoculadas com a estirpe BR3405 e com Glomus etunicatum. Os tratamentos utilizados foram: BR3405 + FMA = Burkholderia s a b i a e + G . e t u n i c a t u m ; F M A = G . etunicatum; BR3405 = Burkholderia sabiae; TN + FMA = testemunha nitrogenada + G. etunicatum; TN = testemunha nitrogenada (sem inoculação e com 30 kg N/ha); TA = testemunha absoluta (sem inoculação e sem nitrogênio). Foram realizadas colheitas aos 80 e 110 dias de cultivo e as plantas foram avaliadas quanto à matéria seca da parte aérea, matéria seca da raiz, matéria seca de nódulos, altura de planta, diâmetro do colo, número de glomerosporos, percentual de colonização radicular e nitrogênio acumulado na matéria seca da parte aérea. A dupla inoculação BR3405 + FMA mostrou-se eficiente para a maximização da produção de plantas dessa espécie, além de induzir maior nodulação e eficiência simbiótica. PA L AV R A S -C H AV E : N o d u l a ç ã o , M i m o s a caesalpiniifolia

Aims: To evaluate the shrub-tree species of natural regeneration in a remnant of Tropical Rain Forest, located in the northeastern region of Brazil. Study Design:  Systematic sampling. Place and Duration of Study: The study was carried out in a remnant of Tropical Rainforest, categorized as a Forest of Miritiba Wildlife Refuge, located in the municipality of Abreu and Lima, distant approximately 42 km from the city of Recife, state of Pernambuco, Brazil. The area has approximately 273.40 ha. The data were collected in November 2016. Methodology: The data were collected in 12 plots (25 m² each) allocated in 3 transects of 100 m in length, equidistant 50 m from each other, perpendicular to the edge of the weir located inside the fragment. The inclusion level established was a minimum height of 1.0 m and a base circumference at 30.0 cm from the ground (CAB 0.30 m) ≤ 15.0 cm. Three height classes (H) were considered, where Class I included individuals with 1.0 ≤ H ≤ 2.0 m; Class II with 2.0 <H <3.0 m and Class III with H> 3.0 m and CAP <15.0 cm. Results: A total of 41 species belonging to 24 botanical families and 31 genus were recorded, representing a density of 8,867 ind.ha-1. The five richest families were Fabaceae, Myrtaceae, Melastomataceae Anacardiaceae and Sapindaceae. The species with the highest estimated densities were Protium heptaphyllum, Erythroxylum mucronatum and Hirtella racemosa. Conclusion: Among the species sampled in the regenerating component, which presented higher density and can be used for enrichment of areas in recovery process are Protium heptaphyllum, Erythroxylum mucronatum, Hirtella racemosa, Myrcia tomentosa and Eschweilera ovata.