Natural regeneration of species in an area degraded under rehabilitation process

Abstract

This study was conducted in an area degraded by the construction of Hydroelectric of Ilha Solteira, SP, Brazil, being in rehabilitation process for 15 years. During this period were implemented green manure species and currently being planted with Brachiaria decumbens Stapf. This work objetive to make the phytosociological survey of tree species that arose spontaneously in this area in the rehabilitation process. The phytosociological sampling included 28 plots with dimension of 10x10m. In each plot a survey of existing species. Parameters were also obtained phytosociological species. The phytosociological survey sampled 88 plants and the species Machaerium acutifolium Vogel greater sociological importance, showing higher density, frequency, dominance, and index value of coverage. Overall, the study area had low diversity because of the 88 plants sampled, 85 belonged to the species Machaerium acutifolium Vogel. Measures taken for rehabilitation of the area studied in begin of the process favored the natural regeneration of these species. The low average plant height, the predominance of small stem diameters, and low tree diversity, indicating that the area is in an early successional stage.