Morfometri daun merupakan rasio antara panjang dan lebar daun yang menjadi salah satu indikator kesehatan mangrove. Penelitian ini bertujuan untuk mendeskripsikan perbandingan variasi morfometri daun Rhizophora mucronata di Pulau Temudong dan Pulau Keramat, Desa Labuhan Bajo, Kecamatan Utan, Sumbawa. Penentuan titik sampel dilakukan secara purposive sampling. Daun yang diambil sebanyak 40 helai yang memiliki bentuk sempurna. Pengukuran tangkai daun di Pulau Temudong antara 2,1-4 cm, pada Pulau Keramat berkisar antara 1,9-3,9 cm. Morfometri daun di Pulau Temudong dan Pulau Keramat diperoleh sebanyak 2 variasi. Variasi Morfometri yang berkisar antara 1 hingga 2 menunjukkan bahwa kondisi kesehatan Rhizophora mucronata pada kedua pulau tidak mengalami gangguan berdasarkan morfometri daunnya. Hal ini didukung oleh kualitas air di kedua pulau yang mendukung pertumbuhan mangrove. Di pulau Temudong diperoleh suhu 29,9-34°C; pH air 7,6-7,8; salinitas 30-32 ppt; dan DO 2,15-3,24 mg/l. Sementara di Pulau Keramat diperoleh suhu 29,4-29,9°C; pH air 7,29-7,24; salinitas 30-32 ppt, dan DO 2,26-4,31 mg/l.
Mangrove is an essential ecosystem for climate change mitigation and adaptation. Yet, mangrove rehabilitation and restoration remain a huge challenge indicated by the unacceptably high failure rate particularly during the early stage after planting. Long-term monitoring and evaluation is one of the key factors to improve success rate. Hence, study on the seedlings’ performance is essential. This study analyzes mangrove seedlings’ health by assessing survival rate and leaf morphometrics in silvofishery sites in Buer Village, Sumbawa District, Indonesia. One-hectare plot of Rhizophora mucronata planted on January 2020 and one-hectare plot of Rhizophora stylosa planted on February 2020 were selected. To analyze leaf morphometrics variations, forty leaves were collected from each plot. The seedlings of R. mucronata (CV 15%) have bigger competition and lower adaptation ability compared to R. stylosa (CV 6%). Water quality parameters supports the growth of Rhizophora, sp. The species selected is appropriate for the location (middle to upper intertidal level). The success rate is high, around 95% and 80% for R. stylosa plot and R. mucronata, respectively. Factors attributed to the high success rate are (i) hydrological intervention, (ii) ownership and buy-in, (iii) international partnership, (iv) land tenure security, and (v) regular monitoring.
in Labangka Village in the South of Sumbawa Island is very important considering that this village is directly facing the Indian Ocean. In addition, the development of aquaculture in this village also requires knowledge of the vegetation that makes up the coastal forest so that appropriate management and monitoring activities can be planned. This study aims to identify the types of vegetation in coastal forest ecosystem in Labangka Village at four stations, namely in locations where super-intensive aquaculture will be built. The method used is the analysis of Importance Value Index and Normalized Differentiation Vegetation Index. The results of the study were as follows: Station 1 (27 species, dominated by Pongamia pinnata with an IVI of 185.64% for the tree level and IVI of 114.58% for the seedling level), Station 2 (9 species, dominated by P. pinnata INP of 214.16 % for the tree level and Leucaena leucocephala IVI 96.49% for the seedling level), Station 3 (18 species dominated by the pes-caprae formation type and shrubs, namely S. taccada, P. tectorius, and Heliotropium foertherianum), Station 4 (19 species dominated by shrubs namely S. taccada, Pandanus tectorius, and H. foertherianum and shrubs (L. camara and C. bonduc).The NDVI at observation stations ranged from -0.091 (sparse) to 0.543 (dense).
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