The mangrove ecological services as carbon sinks and storage are very useful in the efforts to mitigate global warming and climate change. In this study, the above and below-ground biomass, carbon stock, as well as carbon sequestration by the mangroves in Demta Bay, Papua Province, Indonesia were estimated. Allometric equations were used to determine the mangrove biomass in 36 observation plots. The biomass value was used to determine carbon stock and estimate carbon sequestration. Nine mangrove species were found in Demta Bay, with the contribution of mangrove species to biomass (AGB and BGB) in the following order: Rhizophora apiculata > Rhizophora mucronata > Bruguiera gymnorhiza > Bruguiera cylindrica > Heritiera Littoralis > Xylocarpus molucensis > Rhizophora stylosa > Avicennia marina > Sonneratia caseolaris. The average mangrove biomass was estimated at 174.20 ± 68.14 t/ha (AGB = 117.62 ± 45.68 t/ha and BGB = 56.58 ± 22.49 t/ha). The carbon stocks in mangroves at the Ambora site were higher than the Tarfia and Yougapsa sites, averaging 123.57 ± 30.49 t C/ha, 81.64 ± 25.29 t C/ha, and 56.09 ± 39.03 t C/ha, respectively. The average carbon stock in the mangrove ecosystem of Demta Bay is estimated at 87.10 ± 34.07 t C/ha or equivalent to 319.37 ± 124.92 t CO 2 e/ha. The results of this study indicate that the mangrove ecosystem in Demta Bay stores quite high carbon stocks, so it is necessary to maintain it with sustainable management. Therefore, climate change mitigation is not only done by reducing the carbon emission levels but also needs to be balanced by maintaining the mangrove ecosystem services as carbon sinks and sequestration.
Ekosistem hutan mangrove merupakan suatu vegetasi yang tumbuh di lingkungan estuaria pantai yang dapat ditemukan pada garis pantai tropika dan subtropika yang memiliki fungsi secara ekologi, biologi, ekonomi dan sosial budaya, namun saat ini keberadaannya telah mengalami degradasi akibat pemanfaatan yang kurang tepat, dan/atau mengalami perubahan fungsi. Penelitian tentang struktur vegetasi hutan mangrove di kampong Ababiaidi Distrik Supiori Selatan Kabupaten Supiori dilakukan pada bulan November 2015 dengan tujuan untuk mengetahui struktur vegetasi hutan mangrove dan pemanfaatannya. Metode yang digunakan dalam penelitian ini adalah pendekatan ekologi/biologi dan pendekatan antropologi. Dari hasil analisis vegetasi, ditemukan sebanyak 12 jenis tumbuhan mangrove. Rhizophora apiculata merupakan jenis yang dominan pada tingkat pohon dengan nilai kerapatan 809,34 individu/Ha dengan indeks nilai penting (INP) 51,98 kemudian diikuti Rhizophora stylosa dengan nilai kerapatan 721,67 individu/Ha dengan dengan indeks nilai penting (INP) 44,01. Pada tingkat belta Rhizophora stylosa merupakan jenis yang dominan dengan nilai kerapatan 488,33 individu/Ha dengan dengan indeks nilai penting (INP) 63,26 kemudian Rhizophora apiculata dengan nilai kerapatan 416,67 individu/ Ha dengan dengan indeks nilai penting (INP) 49,32. Pada tingkat semai Rhizophora stylosa merupakan jenis dominan dengan nilai kerapatan 916,67 individu/Ha dengan dengan indeks nilai penting (INP) 33,07 dan Rhizophora apiculata dengan nilai kerapatan 800 individu/Ha dengan dengan indeks nilai penting (INP) 29,47. Berdasarkan hasil wawancara dari 12 jenis tumbuhan mangrove yang ditemukan dalam plot pengamatan 9 jenis dimanfaatkan sebagai bahan bangunan, 11 sebagai sumber kayu bakar, 3 jenis sebagai obat-obatan dan 4 jenis untuk keperluan lainnya.
Inventory study of cultivated orchid in District Merauke, Merauke City was done from March–June 2006. Survey methods was used in this study. There were ten species of orchid in this area, consisted of 8 species of native Papuan orchids (Acriopsis javanica Reinw, Dendrobium anthenatum, Dendrobium diskolour Lind, Dendrobium konkolor Lind, Dendrobium nindii, Dendrobium johanes, and two hibrids), and 2 introduce species (Phalaenopsis sp and Phalaenopis amabilis). Dendrobium anthenatum, Dendrobium diskolour Lind, Dendrobium konkolor Lind, and Dendrobium johanes were the most frequently found species, Dendrobium johanes were mostly encountered on the bark of eucalypt tree on secondary forest wich had high humidity. The problems in orchid cultivation in those area were drought, pest, pathogen, and lack of guidance in orchid cultivation as well. Key words: Inventory, orchid, Merauke District, Merauke City.
<h2 align="left"><span style="font-size: 10px;"><br /></span></h2><p><span style="font-size: 10px;">Monitoring shoreline changes is important in detecting abrasion and accretion in coastal areas. This study aimed to determine the level of shoreline change caused by abrasion and accretion and estimate the change rate. The study area covers coastal areas in ten Districts in Biak Numfor Regency (only on Biak Island). Six Landsat image datasets (1997, 2002, 2007, 2013, 2018, and 2022) were used to determine the coastline. Shoreline changes were analysed using DSAS software. The results of digitising the shoreline show a change in the length of the shoreline during the six data periods. Based on NSM and EPR for the last ten years (2013-2022), the average shoreline changes due to abrasion range from -6.65 to -13.16 m with an abrasion rate of -0.76 to -1.50 m/year. Meanwhile, the average shoreline changes due to accretion ranged from 4.64 to 8.45 m with an accretion rate of 0.53 m/year to 0.96 m/year. Changes in shoreline based on the rate of abrasion and accretion vary greatly in each district along the coastal area of Biak Numfor Regency, depending on the EPR value of each transect. Spatially, high abrasion and very high abrasion are widely distributed in Oridek, Biak Utara, Swandiwe, and Warsa Districts. Medium and high accretion were found in Yawosi, Bindifuar, and Oridek Districts. Because there has been a change in the coastline due to abrasion, planning efforts to mitigate coastal areas are very necessary. </span></p>
Ekosistem mangrove Teluk Youtefa memiliki peranan yang sangat vital terhadap kelangsungan hidup penduduk Kota Jayapura, teristimewa masyarakat pesisir yang bermukim di sepanjang garis pantai teluk ini. Kegiatan ini dilakukan sebagai salah satu bentuk kepedulian kampus untuk mendukung pemerintah dalam upaya pelesteraian ekosistem mangrove Holte Camp. Kegiatan ini dilakukan dengan metode: 1). Observasi lokasi; 2). Diskusi Kelompok Terpadu (DKP); 3). Penyuluhan Perikanan Peduli Ekositem Mangrove Berkelanjutan; 4). Evaluasi Kegiatan. Kegiatan ini diselenggarakan pada hari Sabtu tanggal 9 September 2017 di Kantor Desa Holte Camp dengan jumlah peserta sebanyak 22 orang. Hasil kegiatan diskusi perencanaan pengelolaan ekosistem mangrove, dari 59,1% masyarakat yang paham pengelolaan ekosistem mangrove kemudian meningkat menjadi 86,4% setelah mengikuti kegiatan. Dari 77,2% peserta berkomitmen akan merencanakan pengelolaan ekosistem mangrove di pantai Holte Camp dan akan membantu orang lain dalam menyebarluaskan informasi penting ini. Pemerintah dan masyarakat Holte Kamp telah bersepakat dan membentuk organisasi konservasi mangrove.Kata kunci: Ekosistem mangrove, Teluk Youtefa, Hate Camp.
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