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Knowing the relationship between the physical and physiological characteristics of native forest seeds is essential for the successful recovery of riparian forests. Thus, the work was carried out to analyze the physical and physiological parameters of seeds of native forest species for use in the recovery of riparian forests by direct seeding. Were evaluated the physical quality (water content, mass, the weight of one thousand seeds, and the number of seeds per kilogram), morphometric characteristics (length, width, and thickness), and physiological quality in the laboratory (viability) of Cassia grandis L.f., Enterolobium contortisiliquum (Vell.) Morong., Guazuma ulmifolia Lam., and Libidibia ferrea var. leiostachya (Benth.) LPQueiroz. The experiment in the field was implanted in a randomized block design (RBD) with four blocks, testing seeds treated to overcome the four species dormancy. The direct sowing was in 10 planting lines, each composed of 10 pits (30 x 30 x 30 cm), spaced 2.0 x 1.0 m. E. contortisiliquum seeds, despite having the highest values for physical and morphometric characteristics, and having a high percentage of germination, was the species with the lowest percentage of emergence in the field, being below G. ulmifolia, which has seeds of smaller size and weight, and L. ferrea var. leiostachya which, despite having low germination, was the second with the highest percentage of emergence. The study allowed us to observe that there was no direct relationship between the physical and physiological attributes of forest seeds and their ability to emerge. [ABSTRACT FROM AUTHOR]

The study of spatial distribution of tree populations has proven to be important for revealing how individuals are horizontally organized in the environment, facilitating the structural understanding and forms of colonization and dispersion of propagules. The present work aimed at studying the pattern of spatial distribution of tree species Copaifera arenicola [(Ducke) J. Costa e L.P.Queiroz] and its structural relation with the altimetric profile in a Caatinga fragment in Ribeira do Pombal municipality, Bahia. Census of all individuals in the area with circumference at breast height (CBH) = 6 cm was performed. The spatial distribution analysis was conducted for the whole population using Ripley K univariate function, with maximum search radius (h) of 128 m. 409 individuals were found, corresponding to absolute density of 89.49 ind. ha-1 and 0.681 m?. ha-1 of basal area. The group of C. arenicola individuals corresponds to a stable population in expansion phase, presenting higher number of young and medium individuals. The pattern of spatial distribution of individuals in the area under study was the uniform arrangement. None of the altimetric classes of the area had a different influence on the structure and distribution of arboreal individuals. [ABSTRACT FROM AUTHOR]

The riparian forests of the Piauitinga river Basin, Sergipe state, Brazil, are severely degraded, requiring urgent actions aimed their recovery. In this way, the present work was carried out with the objective of analyzing the establishment of native forest species, implanted in a degraded section of riparian forest of the Piauitinga river, in the municipality of Lagarto state of Sergipe, aiming the forest recovery of this area. It was performed the planting of five native forest species, including pioneers and non-pioneers specie, arranged in a randomized block design, in a total of 200 individuals, distributed in 10 individuals with spacing of 1,5m x 1,5m. The Guazuma ulmifolia Lam. species obtained the best results regarding survival, height (111.94 cm) and diameter at soil height (22.89 mm), Guazuma ulmifolia Lam., Tapirira guianensis Aubl. and Sapindus saponaria L. showed to be able to withstand the adversities of the studied environment, and can be recommended in future projects of recovery of the ciliary forests of that planning unit. [ABSTRACT FROM AUTHOR]

Esse estudo foi realizado com o objetivo de analisar o comportamento temporal da sobrevivência de plântulas de espécies florestais nativas, visando à recuperação da vegetação ciliar de dois trechos do Rio Piauitinga, no município de Lagarto, estado de Sergipe. Em campo, o delineamento da semeadura direta se deu em blocos casualizados, testando 5 espécies nativas (2 pioneiras: Guazuma ulmifolia Lam. e Cecropia pachystachya Trécul. e 3 clímax exigentes em luz: Cassia grandis L.f., Enterolobium contortisiliquum (Vell.) e Libidibia ferrea var. leiostachya L. P. Queiroz), utilizando 2 tratamentos (sem e com a aplicação de tratamento para a superação de dormência), em quatro repetições amostrais. Plântulas de E. contortisiliquum originárias de sementes sem quebra de dormência se destacaram, tendo a maior sobrevivência entre as espécies e tratamentos utilizados. L. ferrea var. leiostachya apresentou emergência tardia. A sobrevivência inicial das plântulas das espécies utilizadas nos trechos de mata ciliar do Rio Piauitinga apresentou decréscimo ao passar do tempo, até atingir a estabilização da mortalidade, independente das sementes receberem ou não tratamento para a superação de dormência. The objective of this study was to analyze the temporal behavior of seedlings survival from seeds without and with the application of treatment to overcome dormancy. We used native forest species, in a riparian forest area of the Piauitinga River, at the municipality of Lagarto, Sergipe State, Brazil. In the field, the design of the direct sowing was in randomized blocks, testing 5 native species (2 pioneer: Guazuma ulmifolia Lam. e Cecropia pachystachya Trécul. and 3 climax species, that are demanding of light: Cassia grandis L.f., Enterolobium contortisiliquum (Vell.) and Libidibia ferrea var. leiostachya L. P. Queiroz). We used 2 treatments (without and with the application of treatment to overcome dormancy) in four replicate samples. Seedlings of Enterolobium contortisiliquum from seeds without treatment to overcome dormancy presented the highest survival among the species and treatments used. Libidibia ferrea var. leiostachya presented late emergence. The initial survival of the species seedlings used in the riparian forest sections of the Piauitinga River showed a decrease over time until stabilization was achieved after sowing, regardless treatment to overcome dormancy. [ABSTRACT FROM AUTHOR]

Seed storage under controlled temperature and humidity maintains the viability and the vigor of seeds for a long time while preserving their longevity. Ex situ conservation in a seed storage chamber is perfect for simulating the cool dry conditions that are associated with long-term seed storage. This helps to preserve the availability of seeds for the recovery of degraded areas and to ensure a supply of propagating material for various purposes in silvicultural production, or as raw materials for biotechnological use. The present work evaluated the physical and physiological quality of Enterolobium contortisiliquum (Vell.) Morong seeds from an ex situ collection that was kept in a seed storage chamber at 6 °C ± 3 °C and with 60% ± 5% of RH in waterproof packaging. The water content, the physical quality by X-ray tests, germination, electrical conductivity, and the integrity and quality of RNA that was extracted from the embryonic axes were all determined. It was possible to identify full, damaged, malformed, translucent, and empty seeds. The seeds that had been stored for 1, 5, 9, and 10 years presented 78, 82, 42, and 38% of normal seedlings, respectively, while the lots of 6 and 7 years presented 0 and 6%. The seed storage conditions were the same for all of the lots. A water content higher than 6% influenced the quality of the seeds. The E. contortisiliquum seeds demonstrated high longevity. They could be stored for up to 10 years under controlled conditions. [ABSTRACT FROM AUTHOR]

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