Judul: Species Composition, Stand Structure, Estimation of Biomass and Carbon Content in PIK Mangrove Ecotourism Area, DKI Jakarta
Abstrak: Hutan mangrove memiliki daya simpan karbon yang tinggi, sehingga berpotensi dalam upaya mitigasi perubahan iklim. Penelitian ini bertujuan untuk menganalisis komposisi jenis, struktur tegakan, kandungan biomassa, simpanan karbon, dan serapan karbon dioksida tegakan mangrove di Kawasan Ekowisata Mangrove Pantai Indah Kapuk (PIK), DKI Jakarta. Metode penelitian ini, yaitu stratified random sampling dan perhitungan jumlah plot pengamatan menggunakan rumus Slovin. Analisis simpanan karbon dilakukan menggunakan persamaan alometrik. Dari hasil analisis vegetasi terdapat 10 jenis mangrove, yaitu Rhizophora mucronata, Avicennia marina, Sonneratia caseolaris, Excoecaria agallocha, Cerbera manghas, Terminalia catappa, Rhizophora apiculata, Calophyllum inophyllum, Morinda citrifolia, dan Nypa fruticans. Total biomassa, simpanan karbon, dan serapan karbon dioksida oleh tegakan mangrove secara berturut-turut sebesar 253,18 ton ha-1, 119 ton ha-1, dan 436,71 ton ha-1. Besarnya nilai simpanan karbon dan serapan karbon dioksida dipengaruhi oleh faktor lingkungan yang ada di kawasan pertumbuhan tegakan mangrove.
Keyword: biomassa, karbon, mangrove, Pantai Indah Kapuk

Judul: Estimation of Carbon Content in Mangrove Stands in the Karangsong Mangrove Ecotourism Area, Indramayu Regency
Abstrak: Hutan mangrove mempunyai potensi mitigasi perubahan iklim karena kemampuannya dalam menyerap dan menyimpan karbon dalam waktu lama dan dalam jumlah besar. Adanya alih fungsi lahan dapat merubah komposisi vegetasi hutan mangrove dan mengurangi simpanan karbon. Penelitian ini bertujuan untuk mengetahui komposisi vegetasi pada kawasan ekowisata mangrove Karangsong dan mengetahui kemampuan mangrove dalam menyerap serta menyimpan karbon. Metode dalam penelitian ini yaitu jalur garis berpetak pada 10 titik stasiun pengamatan yang dianggap mewakili keseluruhan karakteristik vegetasi dengan total intensitas sampling sebesar 5%. Analisis kandungan karbon dilakukan menggunakan persamaan alometrik. Dari hasil analisis vegetasi terdapat 4 jenis mangrove, yiatu Avicennia marina, Avicennia alba, Rhizophora stylosa, Rhizophora mucronata. Total biomassa, kandungan karbon dan simpanan karbon dioksida seluruh kawasan seluas 20 ha yaitu beturut-turut sebesar 99,14 ton/ha; 46,6 tonC/ha; 171 tonCO2 /ha. Besarnya kandungan karbon yang tersimpan di kawasan ekowisata Mangrove Karangsong dipengaruhi oleh faktor lingkungan yang terbentuk pada tegakan mangrove., Mangrove forests have the potential to mitigate climate change because of their ability to absorb and store carbon for a long time and in large quantities. The existence of land use change can change the composition of mangrove forest vegetation and reduce carbon sequestration. This study aims to determine the composition of vegetation in the Karangsong mangrove ecotourism area and to determine the ability of mangroves to absorb and store carbon. The method in this study was a line transect plot at 10 points of observation stations which are considered to represent the overall characteristics of the vegetation, the total sampling intensity is 5%. Carbon content analysis was carried out using allometric equations. From the results of the vegetation analysis, there were 4 types of mangroves, namely Avicennia marina, Avicennia alba, Rhizophora stylosa, and Rhizophora mucronata. The total biomass, carbon content, and carbon dioxide uptake in the entire area of 20 ha are 99.14 tons/ha; 46.6 tonsC/ha; and 171 tonsCO2/ha, respectively. The amount of carbon stored in the Karangsong Mangrove ecotourism area was influenced by environmental factors formed in the mangrove stands.
Keyword: biomassa, karbon, mangrove, vegetasi

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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