Abstract
This research was conducted in the coastal area of Humusu Wini Village fromSeptember to November 2020. The aim was to determined the composition and structure as wellas the diversity of mangrove vegetation in the coastal area of Humusu Wini Village, NorthInsana Sub-District, North Central Timor Distric. The analysis of the composition and structureof mangrove vegetation was carried out using the plot-line transect method. The number ofobservation plots were 17 with the plot size ranged from 2 x 2 m, 5 x 5 m, 10 x 10 m, and 20 x20 m. Based on the results of the study, there were 6 mangrove species identified from 4families. The family with the highest number of species is Rhizophoraceae that consist of 3species namely Rhizophora apiculata, Rhizophora stylosa and Bruguiera gymnorhiza. Thehighest Important Value Index in trees level was occupied by Avicennia marina species with140.484%, in poles level was occupied by Xylocarpus granatum species with 74.129%, whilehighest of Important Value Index in saplings and seedling levels was Rhyzophora apiculata with57.994% and 49.444%, respectively. The mangrove vegetation diversity index ranged from 1,22to 1,68, which can be categorized as moderate or fairly good of diversity index.
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