Baluran National Park is a oldes national park and unique in terms of existing ecosystems. One area that is considered to be of broad condition is Bama Resort. Baluran National Park has various forest formations including mangrove formations, coastal forests, savana forests, seasonal forests, rainforests, and plain forests. This study aims to examine the composition and structure of each forest formation in Baluran National Park in East Java. The number of plant species found in mangrove forest formations were 6 species, 40 species of coastal forest, 37 species of savana forest, 44 species of rain forest, 28 species of lowland forest, and 50 species of seasonal forest formations. The highest density values were in savana forest formation at the seedlings and understorey level of 132445 ind / ha while the density at the tree level was found in the mangrove forest formation of 346 ind / ha. The diversity index of seedlings and understorey species is medium (2 <H '<3) while for other growth rates it is classified as medium and low (0 <H' <3). The value of community similarity between overall forest formations is categorized as low (values below 50%.). Overall header stratification in each formation is in strata c. Key words: Forest Formation, Species Composition, Structure, Baluran National Park

Mangrove ecosystem have various important roles as habitat for marine and terrestrial species. However, the ecosystem has recently faced anthropogenic threats delivered by the expansion of aquaculture pond. Study of mangrove diversity was conducted in Production FMU Bulungan Unit VIII, North Kalimantan. The study was aimed to analyze species diversity in the FMU Bulungan Unit VIII and determine community perception on existing mangrove condition. Vegetation analysis was applied to quantify mangrove community in two sampling locations, Salimbatu and Liagu, within 26 quadratic plots (10mx10m). As many as 63 respondents were interviewed to analyze communities’ perception. As the result, 10 species were identified species and one unidentified species recorded during the survey. Rhizophoraceae was dominated the species composition in sampling area. Rhizophora mucronata had the highest Importance Value Index in tree and seedling stage while Rhizophora apiculata was dominant in sapling stage. On the other hand, Bruguiera parviflora was recorded on each growth stages in all sampling plots. Species diversity index (H’) of mangrove vegetation in the FMU was found at 1,68 with species richness index value 1,58. This diversity index considered as moderate diverse since only few vegetation species are able to live in the mangal. The perpendicular structure of mangrove in the FMU formed an inverse J-shape which showed normal growth of uneven-age forest stand. The interview result implied that more than 50% of the respondent considered that mangrove condition in their village area has been disturbed. Therefore mangrove management with local community involvement is neccessarily required to improve the mangrove performance. Keywords: communities perception, habitat, mangrove, species diversity