ESPÉCIES ARBÓREAS NATIVAS DA MATA CILIAR DA BACIA HIDROGRÁFICA DO RIO LAJEADO TUNAS , NA REGIÃO DO ALTO URUGUAI , RS
The riparian woods have influence on the water bodies in several ways and the removal of these woods causes harm to both human beings and nature. With the objective to know the arboreal species from the Riparian Woods of the watershed of the Lajeado Tunas River in Frederico Westphalen (27º1887S and 53º2172W), a study was conducted in order to identify and list the vegetation found there between August 2002 and June 2006, by using the method called Caminhamento. There were 89 arboreal species identified at the, sorted into 30 families. The most representative family was the Fabaceae with 15 species, followed by the Myrtaceae with 10, the Euphorbiaceae and the Rutaceae with seven each and the Sapindaceae with six. Size of the watershed is 649,63ha, being 86,52 ha Permanent Preservation Areas (PPAs). In 48,45ha from these PPAs there are riparian woods. The farming activities associated to burning and forest cutting are pointed out as the main causes of the forest fragmentation and the degradation of the ecosystems associated to the watershed. This list generates information about the species that can be used to recover the Riparian Woods of the watershed of the Lajeado Tunas River, it provides information on the Riparian Woods of the Alto Uruguai, and besides that it also may be useful as a database for further studies.