MARDHIYAH, DEERA HERDI (2023) ESTIMASI SIMPANAN KARBON PADA SEDIMEN EKOSISTEM MANGROVE DI KEPULAUAN SERIBU (23dos124). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
(Deera Herdi Mardhiyah. 26050119130067. Estimasi Simpanan Karbon Pada Sedimen Ekosistem Mangrove di Kepulauan Seribu. Muslim & Susi Rahmawati).
Kepulauan Seribu terdiri dari pulau-pulau kecil dengan ekosistem mangrove tersebar di sepanjang pesisir pulau. Ekosistem mangrove menjadi salah satu solusi perubahan iklim global dengan menahan laju peningkatan gas karbon dioksida (CO₂) di atmosfer. Sedimen pada ekosistem mangrove memberikan kontribusi terhadap ekosistem laut dan penyimpanan karbon dalam jumlah yang besar serta jangka waktu yang panjang. Penelitian ini bertujuan untuk mengetahui kondisi struktur ekosistem mangrove dan menganalisis potensi simpanan karbon pada sedimen mangrove di Kepulauan Seribu. Pengambilan data lapangan dilakukan pada 3-8 November 2021 dengan metode purposive sampling pada 7 pulau yang tersebar mencakup Pulau Dua, Pulau Panjaliran Barat, Pulau Sebaru Kecil, Pulau Melintang Besar, Pulau Pamegaran, Pulau Pari, dan Pulau Lancang Besar. Data struktur vegetasi mangrove dihimpun dengan mengumpulkan data jenis, diameter, tinggi, tutupan dan kerapatan mangrove. Metode hemispherical photography dilakukan untuk mengukur persentase tutupan kanopi melalui foto kamera. Estimasi simpanan karbon pada sedimen dilakukan dengan metode Loss on Ignition (LOI) dengan mengkaji hingga kedalaman 15 cm. Dry sieving dilakukan untuk mendapatkan data klasifikasi fraksi sedimen. Hasil penelitian menunjukkan kondisi vegetasi mangrove di Kepulauan Seribu tergolong baik dengan persentase tutupan rata-rata yaitu 72,911%. Ditemukan 8 jenis mangrove di Kepulauan Seribu. Spesies Rhizophora stylosa mendominasi hampir seluruh pulau kecuali Pulau Panjaliran Barat dengan nilai INP rata-rata sebesar 206,857%. Kerapatan mangrove memiliki rentang 5333-8533 ind/ha dengan kerapatan tertinggi terdapat di Pulau Pamegaran dan terendah di Pulau Panjaliran Barat. Perbedaan dry bulk density dan simpanan karbon memiliki nilai berbanding lurus. Potensi simpanan karbon pada sedimen mangrove memiliki rentang 33,968 - 163,883 tonC/ha dan rata-rata keseluruhan sebesar 120,06 tonC/ha. Substrat pasir mendominasi Kepulauan Seribu dengan persentase sebesar 61,475%. Hubungan antara simpanan karbon dan ukuran butir pada penelitian ini memiliki nilai koefisien korelasi sebesar 0,4834 yang menunjukkan hubungan keduanya tidak terlalu kuat.
Kata Kunci : Mangrove, Sedimen, Stok Karbon, Kepulauan Seribu

ABSTRACT
(Deera Herdi Mardhiyah. 26050119130067. Estimation of Carbon Storage in Sediments of Mangrove Ecosystem in Seribu Islands. Muslim & Susi Rahmawati).
Seribu Islands consist of small islands with mangrove ecosystems scattered along the coast of the island. Mangrove ecosystems are one of the solutions to global climate change by buffering the increase of carbon dioxide (CO₂) gas in the atmosphere. Sediments in mangrove ecosystems contribute to marine ecosystems and carbon storage in large quantities and long periods. This study aims to determine the condition of the mangrove ecosystem structure and analyze the potential for carbon storage in mangrove sediments in Seribu Islands. Field data was collected from November 3-8, 2021 using purposive sampling method on 7 islands including Dua Island, West Panjaliran Island, Sebaru Kecil Island, Melintang Besar Island, Pamegaran Island, Pari Island, and Lancang Besar Island. Data on mangrove vegetation structure was compiled by collecting data on mangrove species, diameter, height, and density. The hemispherical photography method was used to measure the percentage canopy cover through camera photos. Estimation of carbon storage in sediments was conducted using the Loss on Ignition (LOI) method by assessing 15 cm depth. Dry sieving was conducted to obtain sediment fraction classification data. The results showed that the condition of mangrove vegetation in Seribu Islands was classified as good with an average cover percentage of 72.911%. Eight types of mangroves were found in the Seribu Islands. Rhizophora stylosa species dominates almost all islands except West Panjaliran Island with an average INP 206.857%. Mangrove density has a range of 5333-8533 ind/ha with the highest density found on Pamegaran Island and the lowest on West Panjaliran Island. The difference in dry bulk density and carbon storage has a linear value. Potential carbon storage in mangrove sediments has a range of 33.968 - 163.883 tonsC/ha and an overall average of 120.06 tonsC/ha. Sand substrate dominates the Seribu Islands with a percentage of 61.475%. The relationship between carbon storage and grain size has a correlation coefficient of 0.2339 which indicates a not very strong relationship between the two variables.
Keywords : Mangrove, Sediment, Carbon Stock, Seribu Islands

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