| Summary: | The development of mangrove ecosystem in Laguna Segara Anakan is
dynamic due to its high rate of sedimentation, which has been creating a new land
on the lagoon. Sedimentation supplies mud substrates and supports the
development of mangrove succession. This study aimed to identify the rate of land
accretion development and succession of mangrove vegetation. The results is
useful for prioritizing management between reducing the development of land
accretion and managing the mangrove ecosystem which is significant for the
sustainability of Laguna Segara Anakan.
The succession of mangrove was studied by integrating remote sensing
technique, Geographic Information Systems (GIS) approach and field survey. The
development of its land accretion and vegetation cover on the mangrove forests, in
terms of area and distribution, were observed through identification, interpretation
and supervised classification technique of the satellite data. Field surveys were
conducted to test the correctness of the interpretation of the results and to obtain
the data of mangrove succession development. The study was classified into three
block based on its succession stage i.e., the early stage of mangrove block, which
is in the areas of new land, the middle stage of mangrove block developed during
earlier period of land accretion and the mangrove control block of natural
mangrove with minimum disturbance.
Results of this study showed that from 1996 until 2013, the rate of the land
accretion in Laguna Segara Anakan were 21.1545 ha/year. Until September 2013,
total of the land accretion in Laguna Segara Anakan was 1041,878 ha, as the
accumulation of sedimentation. Mangrove succession on the land accretion of
Laguna Segara Anakan was observed from the development of vegetation cover
dominated by the seedling of pioneer species (54,92 %) of Avicennia marina and
Sonneratia caseolaris and shrubs (45,07 %) of Acanthus ebracteatus and Derris
trifoliata which grow on the substrate with a range of organic matter content of 1-
1.5 %. In conclusion, the stage of mangrove succession on the land accretion of
Laguna Segara Anakan was identified as early succession occupied by pioneer
mangrove species.
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