A necessidade de se conservar as áreas de preservação permanente (APPs) é crescente, devido a sua relevância para a sobrevivência da fauna, flora, das populações que utilizam esses recursos naturais e para a proteção dos cursos de água. O objetivo do trabalho foi caracterizar a composição e a diversidade florística de um fragmento de floresta secundária em uma APP no Projeto de Assentamento Assurini em Altamira – Pará, identificando espécies que poderiam ser utilizadas na reposição de florestas ciliares degradadas existentes na região. O estudo foi realizado em uma floresta secundária às margens do Igarapé Dispensa, em propriedades de agricultores familiares. Em cada área foram instaladas duas parcelas com dimensão de 10 m x 25 m, nas quais foram inventariados todos os indivíduos lenhosos e sublenhosos com DAP ≥ 10 cm presentes nos limites de cada unidade amostral. Foi analisada a composição florística e estimadas a riqueza e a diversidade. Na floresta secundária, foram identificados 279 indivíduos, 49 espécies, 43 gêneros e 26 famílias. A família com maior número de espécies e de indivíduos foi a Fabaceae. O índice de diversidade de Shannon (H’) foi de 3,43 nats/ind, considerado com uma diversidade satisfatória. As referidas espécies têm potencial para serem utilizadas em propostas de regeneração das APP do Igarapé Dispensa.

The jatobá (Hymenaea courbaril L.) belongs to the family Fabaceae and subfamily Caesalpinioideae. It is a specie used for various purposes, it has a huge economic and ecological value, highly indicated for degraded areas recovery. In this context, this research aimed to evaluate the jatobá seedlings development, cultivated in hydroponic system and on the soil, in order to verify which is the most promising system for the seedlings production of the specie. The experiment was conducted in a greenhouse of the Forestry Engineering School of Pará's Federal University-UFPA, in the municipality of Altamira-PA. The experimental design used was in blocks completely randomized with two treatments (Hydroponic System and Soil) with four repetitions, being each repetition composed by five plants, making four blocks each treatment. The seedlings were cultivated in soil horizon B oxisol (treatment 1) and nutritional solution (treatment 2). The following parameters were evaluated: height, collar diameter, dry matter weight of the aerial part and root system and nitrogen contents, phosphorus and potassium of the aerial part and the root. The development in the seedlings diameter was similar in both studied systems, however, the best jatobá seedlings development observed was in soil cultivation, although the hydroponic system had provided better nitrogen and phosphorus absorption. The potassium absorption was similar between the treatments.

This work has as general objective to make a bibliographical review on the agribusiness of floriculture in the North region with emphasis in the state of Pará, seeking to analyze the cultures of major importance, production and marketing. The Brazilian floriculture has been growing and demonstrating enormous expression in the national and international market, being considered one of the main segments of the contemporary agribusiness. The northern region is the most recent region of flower and ornamental plants in the country. The largest regional producer of flowers and ornamental plants is the state of Pará, which develops a floriculture based on the exploitation of tropical foliage and flowers for cutting, as well as an expressive production of ornamental plants for gardening and landscaping. The municipality that has most stood out in the cultivation of flowers is Benevides, with a production of 50 thousand bundles of zinia, rose, clove, heliconia, emperor baton, among others per year.