Judul: Potensi Simpanan Karbon pada Hutan Tanaman di Pusat Sumber Benih dan Persemaian Rumpin, Rumpin, Bogor
Abstrak: Hutan tanaman monokultur dan campuran sebagai areal sumber benih berperan penting dalam upaya mitigasi perubahan iklim. Penelitian bertujuan untuk mengetahui komposisi jenis dan struktur vegetasi, keadaan biomassa, simpanan karbon dan serapan karbondioksida (CO2) bagian atas permukaan tanah pada hutan tanaman monokultur dan campuran di Pusat Sumber Benih dan Persemaian Rumpin. Perhitungan cadangan karbon menggunakan metode non-destruktif dengan rumus alometrik, serta dilakukan perhitungan biomassa pada serasah lantai hutan. Hasil penelitian menunjukkan komposisi jenis dan jumlah jenis yang ditemukan di pola tanam campuran lebih banyak dibandingkan dengan monokultur. Struktur horizontal tegakan menunjukkan adanya regenerasi tegakan dan struktur vertikal didominasi pohon stratum C. Simpanan karbon pada pola tanam campuran sebesar 101,559 ton C/ha (tinggi) dengan serapan CO2 sebesar 372,722 ton CO2/ha. Simpanan karbon pada pola tanam monokultur sebesar 55,232 ton C/ha (sedang) dengan serapan CO2 sebesar 202,700 ton CO2/ha. Perbedaan biomassa, simpanan karbon, dan serapan CO2 tiap plot dipengaruhi oleh keragaman jenis., Monoculture and mixed plantations as seed source areas had an important role in climate change mitigation. This study aims to determine the composition of vegetation types and structures, biomass conditions, carbon storage and aboveground carbondioxide (CO2) uptake in monoculture and mixed plantations forests at the Rumpin Seed Source and Nursery Center. Calculation of carbon stocks using non-destructive methods with allometric formulas, and necromass calculations on forest floor litter. The results showed that the type composition and number of types found in mixed plantations patterns were more than monocultures. The horizontal structure indicates a regeneration and the vertical structure is dominated by stratum C. Carbon storage in mixed planting pattern amounted to 101,559 ton C/ha (high) with CO2 absorption of 372,722 ton CO2/ha. Carbon storage in monoculture planting pattern amounted to 55,232 ton C/ha (medium) with tons CO2 absorption of 202,700 ton CO2/ha. The differences in biomass, carbon storage, and CO2 sequestration of each plot are influenced by the diversity of stands types.
Keyword: carbon storage, mixed, monoculture, species composition, vegetation structure

Judul: Potensi Simpanan Karbon Tanah di Hutan Tanaman Monokultur dan Polikultur Pusat Perbenihan dan Persemaian Rumpin
Abstrak: Tanah memiliki peran yang sangat penting dalam dinamika karbon. Penelitian ini bertujuan menghitung potensi simpanan karbon tanah pada kedalaman 20 cm di hutan tanaman sejenis (monokultur) dan hutan tanaman campuran (polikultur) Pusat Perbenihan dan Persemaian Rumpin, Kabupaten Bogor, Jawa Barat. Penelitian dilakukan dengan membuat petak contoh berukuran 20 x 20 m sebanyak 16 plot untuk masing-masing lokasi. Analisis contoh tanah dilakukan di Laboratorium Tanah Pusat Perbenihan dan Persemaian Rumpin. Simpanan karbon tanah dipengaruhi oleh tiga variabel utama yang saling terikat yaitu C-organik, bobot isi tanah, dan kedalaman tanah. Total simpanan karbon tanah di hutan tanaman sejenis (monokultur) sebesar 7.365,24 ton/ha sedangkan total simpanan karbon tanah di hutan tanaman campuran (polikultur) sebesar 8.593,6 ton/ha. Hasil uji korelasi menunjukkan bahwa semakin tinggi nilai kerapatan tegakan maka simpanan karbon tanah akan semakin tinggi., Soil has a very important role in carbon dynamics. This study aims to calculate the potential for soil carbon storage at a depth of 20 cm in similar plantation forests (monocultures) and mixed plantations (polycultures) Rumpin Seed Source and Nursery Center, Bogor Regency, West Java. The study was conducted by making sample plots measuring 20 x 20 m as many as 16 plots for each location. Analysis of soil samples was carried out at the Rumpin Seed Source and Nursery Center Soil Laboratory. Soil carbon storage is influenced by three main variables that are interlocked, namely C-organic, bulkdensity, and soil depth. Total soil carbon storage in monoculture plantations amounted to 7.365,24 ton/ha while total soil carbon storage in mixed plantation forests (polyculture) amounted to 8.593,6 ton/ha. The results of the correlation test show that the higher the stand density value, the higher the soil carbon storage.
Keyword: forest, monoculture, polyculture, soil carbon, soil

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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