SUMMARY
Composition of Aquatic Macrophytes and Riparian Vegetation in Lake Sentani, Papua Province. Macrophytes and riparian vegetation play an important role in maintaining the balance of aquatic ecosystems. The loss of vegetation components can lead to increased sedimentation and change the microhabitat in the waters. This research aimed to obtain the composition of aquatic macrophytes and riparian vegetation in Lake Sentani, as well as to determine the status of waters and the characteristics of riparian zones in Sentani Lake. The research was conducted from September to October 2014. The sampling of aquatic macrophytes and riparian vegetation was conducted at 5 stations: St.1 (Doyo Lama), St.2 (Donday), St.3 (Deyau), St.4 (Kalkotte), and St. 5 (Jaifuri). Data of aquatic macrophytes was taken using square plot (1 x 1 m2) of 15 plots, while riparian vegetation data used survey method with 10 m transect line from the shoreline. The results showed that there were 10 species of aquatic macrophytes from 8 families and 30 species of riparian vegetation from 18 families. Based on these aquatic macrophytes and riparian vegetation, Lake Sentani is categorized as eutrophic, with the dominant macrophyte being hornworts (Ceratophyllum demersum L.; 135 individuals). Station 4 (Kalkotte) has the largest number of individual aquatic macrophytes (96 individuals). Cogongrass (Imperata cylindrica (L.) Beauv.) was found to be the most abundant species of riparian vegetation in all stations (190 individuals). This is related to the shoreline of Lake Sentani which is largely a sandy soil. Station 5 (Jaifuri) has the largest number of species and the largest number of individual riparian vegetation (344 individuals from 20 species).