Comparação entre dois modelos de recuperação florestal na área de preservação permanente da barragem do Rio Siriji, Vicência - PE.

Abstract

The devastation of forests worldwide are eminent, agricultural expansion and urbanization are a major contributor to the suppression of native forests. In light of this alarming situation, the concern for conservation and restoration of vegetation is crucial. Thus, this study aimed to evaluate the models used for forest restoration in the implementation of riparian vegetation in the dam of the River Siriji in Vicência, Pernambuco. The study was concentrated in the first two modules of reclamation of the permanent preservation of the dam of the River Siriji, each module has an area of 5 ha. The first model has the successional forest restoration planting in rows with species diversity and has the second model of induction and conduction of natural regeneration. We installed 40 permanent plots distributed on a systematic 10.0 X 10.0 m. Twenty plots in each module. We sampled plots, all individuals taller than one meter, which were within the 40 sample units in the area, circumference measured at the level of the height of the base (CAB) as well as the estimated time. In the successional model of planting in rows with a diversity of species sampled were 449 living individuals belonging to 14 botanical families, 22 general and 24 species of trees, of which 22 were identified at the species level and 2 were identified at the genus level. In the model of induction and conduction of natural regeneration were sampled 774 live individuals, belonging to 17 botanical families, 22 genera and 24 species of trees, of which 19 were identified at the species level, three were identified in the genus and two were identified only with the common name. The families Fabaceae and Mimosaceae, contributed to a greater number of species (8:03 respectively). In terms of individuals were larger families Mimosaceae (298), Fabaceae (159) and Sapindaceae (140). Regarding the importance value (VI), the species that stood out were Tapirira guianensis and Acacia paniculata. The use of these species in other areas of recovery can lead to satisfactory results regarding their adjustment to the site. The diversity index of Shannon - Wiener (H ') of 2.98 nats / individuals for the successional model of planting in rows with a diversity of species and the induction model and the natural regeneration management Shannon - Wiener (H ') was 2.49 nats / individuals. The successional classification had a greater number of species in early successional (pioneer + early secondary) and in all size classes, we can affirm that the studied fragment is presented as a secondary forest in early succession. By comparison conducted in two models of forest recovery, no representative floristic similarity, with floristic differences between the studied areas. Regarding the data structure and deployment costs among the models analyzed, they showed differences in their data, showing that the composition of each type of forest recovery influenced significant differences between them. Both models have studied recovery characteristics and individual qualities that promote their establishment. Separated may show some weak points, but together they can meet their needs and ensure successful recovery of the area.