Caracterização de uma vegetação dominada por Leucaena leucocephala como subsídio à elaboração de um projeto de recuperação de área degradada em um imóvel urbano em Londrina, PR

Abstract

Urban expansion has generated various environmental impacts, particularly in permanent preservation areas, where degradation compromises essential resources such as water resources. This study aimed to present a preliminary proposal for a Degraded Area Recovery Project to control Leucaena leucocephala on a property adjacent to an urban Permanent Preservation Area (PPA) in Londrina, PR. For this purpose, four sample plots of 100 m² were allocated in the study area to determine the density of Leucaena and native species with a circumference at breast height (CBH) greater than or equal to 6 cm. To assess the potential for natural regeneration, ten sample subplots (each 4 m²) were allocated, totaling 40 subplots. Additionally, five 1 m² plots were allocated on the edge of the study area. The diagnosis revealed that 97.09% of the plants found belonged to the species Leucaena leucocephala, totaling a density of 5689,95 individuals per hectare for individuals with a diameter at breast height (DBH) greater than 5 cm. In contrast, only 2.99% of the sampled plants belonged to two other species found in the 100 m² plots. In the regenerating stratum, 75.55% of the sampled plants belonged to Leucaena (an invasive species), while 15.80% belonged to Pavonia sp, a shrub species (mallow family). The remaining 8.64% belonged to the other seven species found in the regenerating stratum, indicating low richness and density of natural regeneration. It is recommended to remove all Leucaena plants from the area, followed by planting throughout the area with native species from the cover group, which are fast-growing and provide shade, at a spacing of 3 x 3 m, and subsequent enrichment planting.