A Vegetação ciliar no córrego Laranja Doce, Dourados MS: diagnostico e propostas de intervenção

Abstract

Riparian areas play an important role as suppliers of environmental services such as water for human and agricultural consumption, soil conservation, climate mitigation and biodiversity maintenance. This region, located along the rivers and other bodies of water, presents great phytophysiognomic range, with arboreal, shrub and herbaceous formations forming mosaics of vegetation. The Laranja Doce stream - LDS - is the largest water course in Dourados urban area, with a basin of 715km2 extension, subject to several disturbances due to the human activities. This work describes the riparian vegetation of the Permanent Preservation Area - PPA - of the LDS in Dourados, MS, with the objective of proposing interventions aimed at improving environmental conditions and protecting biodiversity. Geographic information system - Qgis - was used to map the area, besides the qualitative and quantitative study of the arboreal sinusia and descriptive component for the shrub and herbaceous components of the riparian vegetation. The PPA of LDS mapping resulted in 73 hectares, 92% are forests and 7% are areas with disturbed vegetation. A total of 66 tree species belonging to 26 families were sampled, with a total density of 1,470 individuals/ha and a total basal area of 29,454 m2/ha. The estimated Shannon Diversity Index for the sample was 3.144 nats/indiv., while Equity was 0.75. The most important arboreal species were Croton urucurana Baill., Guarea guidonia (L.) Sleumer and Leucaena leucocephala (Lam.) De Wit. Among the herbaceous species, it is worth mentioning the Hedychium coronarium (Zingiberaceae), which together with Leucaena leucocephala - Fabaceae, both invasive exotic species, dominated wide areas. Based on the diagnosis, the general structure of an action plan for the PPA was proposed, considering five main lines of action: invasive alien species control, research, vegetation restoration, environmental education and monitoring.