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: Potensi Simpanan Karbon Tanah di Areal Kawasan Hutan Dengan Tujuan Khusus (KHDTK) Haurbentes, Kabupaten Bogor, Jawa Barat
Abstrak: Hutan memiliki peranan yang penting dalam menjaga keseimbangan iklim bumi. Keberadaan hutan beserta komponen di dalamnya mampu mengurangi kandungan CO2 di atmosfer. Penelitian ini bertujuan untuk menghitung potensi simpanan karbon tanah pada lahan hutan tanaman Kawasan Hutan dengan Tujuan Khusus (KHDTK) Haurbentes, Kabupaten Bogor, Jawa Barat dan menganalisis hubungan antara kerapatan tegakan serta karakteristik tanah terhadap simpanan karbon tanah. Penelitian dilakukan dengan membuat petak contoh berukuran 20 x 20 m. Analisis contoh tanah untuk mengetahui nilai bobot isi (soil bulk density) dan C-organik dilakukan di Laboratorium Pengaruh Hutan, Fakultas Kehutanan dan Lingkungan IPB. Hasil penelitian menunjukkan nilai bobot isi (soil bulk density) pada jalur penelitian berkisar 0,505 – 0,795 g/cm3. Analisis C-organik tanah pada jalur penelitian berkisar 0,067 - 0,200 %. Simpanan rata-rata karbon tanah pada jalur penelitian memperoleh nilai sebesar 200,217 ton/ha. Hasil uji korelasi menunjukkan bahwa semakin tinggi nilai C-organik dan kerapatan tegakan maka simpanan karbon tanah akan semakin tinggi dan semakin tinggi bobot isi tanah maka simpanan karbon organik tanahnya akan semakin rendah., Forests have an important role in maintaining the balance of the earth's climate. The existence of forests and their components can reduce the CO2 content in the atmosphere. This study aims to calculate the potential for soil carbon storage in forest plantations in the Special Purpose Forest Area (KHDTK) Haurbentes, Bogor Regency, West Java and analyze the relationship between stand density and soil characteristics on soil carbon storage. The research was conducted by making sample plots measuring 20 x 20 m. Sample analysis to obtain soil bulk density and C-organic values was carried out at the Forest Influence Laboratory, Faculty of Forestry and Enviroment, IPB. The results showed that the soil bulk density at the research site ranged from 0,505 to 0,795 g/cm3. C-organic analysis of the soil at the study site ranged from 0,067 – 0,200 %. The average soil carbon storage at the study site was 200,217 tons/ha. The results of the correlation test showed that the higher the organic C value and stand density, the higher the soil carbon storage and the higher the soil density, the lower the soil carbon organic storage.
Keyword: bobot isi, C-organik, hutan, karbon tanah, perubahan iklim, bulk density, C-organic, climate change, forest, soil carbon

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.
Keyword: