ANALYSIS OF MANGROVE FOREST VEGETATION IN SINGA GEWEH VILLAGE, EAST KUTAI DISTRICT, EAST KALIMANTAN PROVINCE
Abstract
Mangroves have a very important role in protecting beaches from waves, sea winds and storms, protecting settlements, buildings and agriculture from strong winds or sea water intrusion and have also been proven to play an important role in protecting coasts from storms. Plant vegetation analysis is a way to study the composition of species and the form of vegetation structure. The aim of this research is to determine the composition of mangrove species, Importance Value Index, species diversity index, species evenness index, species dominance index and mangrove vegetation structure in Singa Geweh Village. This research was conducted for approximately 3 months.The Singa Geweh sub-district area is the object of research for analysis of mangrove forest vegetation using the stratified random sampling plot method which will be studied as many as 36 plots.The results of the research found 4 families, namely Avicenniaceae, Lythraceae, Rubiaceae and Rhizophoraceae, consisting of 8 species, namely Avicennia lanata, Phemphis acidula, Scyphiphora hydrophyllacea, Bruguiera sexangula, Ceriops zippeliana, Ceriops tagal, Rhizophora apiculata, and Rhizophora mucronata with a total number of 859 individuals. The highest importance value is the Rhizophora apiculata type at 230.40% for tree level, 168.20% for pole level, 103.95% for sapling level and 146.61% for seedling level. Species diversity at the tree and seedling level is low, while at the pole and sapling level it is moderate. Species evenness at the tree level is classified as low, while for the pole, sapling and seedling level it is classified as moderate. The dominant type is the Rhizophora apiculata type with a value for tree level of 0.77077, pole level of 0.29075, sapling level of 0.21910 and for seedling level of 0.49593.The horizontal stand structure of mangrove vegetation at tree level forms an L Form or inverted J pattern curve indicating that the tree population at the research location in the mangrove forest of Singa Geweh Subdistrict tends to develop towards uneven-age balanced forest (forest of all ages which is balanced), namely the larger the tree diameter. the fewer the number of individuals. The vertical stand structure of mangrove vegetation at tree level consists of 2 canopy layers, namely stratum B and C.
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