Electronic Theses and Dissertation

Telah dilakukan penelitian tentang estimasi stok karbon pada vegetasi mangrove jenis Rhizophora stylosa, Rhizophora apiculata dan Rhizophora mucronata di Gampong Lamnga, Aceh Besar, pada bulan Februari 2026. Penelitian ini bertujuan untuk menghitung karbon biomassa pada vegetasi yang meliputi kategori pohon dan karbon organik tanah mangrove jenis Rhizophora stylosa, Rhizophora apiculata dan Rhizophora mucronata. Penelitian dilakukan menggunakan metode purposive sampling dengan 5 stasiun berbeda berdasarkan tingkat kerapatan vegetasi yang berbeda-beda. Pengambilan data dilakukan secara non-destruktif menggunakan transek kuadrat dan perhitungan biomassa menggunakan persamaan alometrik spesifik. Pengukuran karbon tanah dilakukan menggunakan metode Loss on Ignition (LOI) dan penghitungan bulk density. Hasil penelitian menunjukkan bahwa biomassa pohon tertinggi terdapat pada stasiun 3 dengan total biomassa 1359,01 kg/m2 dan kandungan karbon sebesar 21,99 ton/ha. Sebaliknya, stok karbon tanah tertinggi ditemukan di stasiun 2 sebesar 21,38 ton/ha. Hasil ini menunjukkan meskipun biomassa vegetasi tertinggi terdapat pada Stasiun 3, kandungan karbon tanah justru lebih besar pada Stasiun 2. Hal ini mengindikasikan bahwa distribusi stok karbon tidak hanya dipengaruhi oleh tingginya biomassa vegetasi, tetapi juga oleh kondisi lingkungan yang memengaruhi akumulasi karbon tanah. Oleh karena itu, analisis terhadap biomassa vegetasi dan karbon tanah perlu dilakukan secara terpadu untuk memperoleh estimasi cadangan karbon yang lebih akurat dalam ekosistem mangrove.

Kata Kunci: Rhizophora stylosa, Rhizophora apiculata, Rhizophora mucronata, karbon biomassa, alometrik, karbon tanah, Gampong Lamnga, bulk density.

A study on carbon stock estimation of mangrove vegetation consisting of Rhizophora stylosa, Rhizophora apiculata, and Rhizophora mucronata was conducted in Gampong Lamnga, Aceh Besar, in February 2026. This study aimed to quantify biomass carbon storage in vegetation, particularly at the tree level, as well as soil organic carbon in mangrove ecosystems dominated by these species. The research employed a purposive sampling method across five stations representing different vegetation density levels. Data collection was carried out non-destructively using quadrat transects, and biomass was estimated using species-specific allometric equations. Soil carbon measurements were conducted using the Loss on Ignition (LOI) method and bulk density analysis. The results showed that the highest tree biomass was found at Station 2, with a total biomass of 1359.01 kg/m2 and carbon content of 21.99 ton/ha. In contrast, the highest soil carbon stock was recorded at Station 2, amounting to 21.38 ton/ha. These findings indicate that although vegetation biomass is highest at Station 3, soil carbon content is greater at Station 2. This suggests that carbon stock distribution is not solely influenced by vegetation biomass but also by environmental factors affecting soil carbon accumulation. Therefore, integrated analysis of vegetation biomass and soil carbon is essential to obtain a more accurate estimation of total carbon stock in mangrove ecosystems. Keywords: Rhizophora stylosa, Rhizophora apiculata, Rhizophora mucronata, biomass carbon, soil carbon, allometric, Gampong Lamnga, bulk density.