Judul: Carbon Stock Potential of Two Urban Forests in Special Capital District of Jakarta
Abstrak: Hutan kota sebagai ruang terbuka hijau di kawasan perkotaan berperan penting dalam upaya mitigasi perubahan iklim. Penelitian bertujuan untuk mengidentifikasi, mendeskripsikan, dan menganalisis keanekaragaman jenis, serta mengukur potensi cadangan karbon dari vegetasi di dua kawasan hutan kota DKI Jakarta, yaitu Hutan Kota Sangga Buana dan Hutan Kota Sukapura. Perhitungan cadangan karbon menggunakan metode non-destruktif dengan rumus alometrik, serta dilakukan perhitungan nekromassa pada pohon mati dan serasah lantai hutan. Hasil penelitian menunjukkan perbedaan komposisi tegakan pada masing-masing lokasi, dengan adanya jenis yang mendominasi di setiap lokasi yaitu Sukun (Artocarpus altilis) di Hutan Kota Sangga Buana dan Mahoni (Swietenia macrophylla) di Hutan Kota Sukapura. Cadangan karbon di Hutan Kota Sangga Buana tergolong tinggi dengan nilai 124,56 ton C/ha dengan kemampuan serapan CO2 sebesar 457,13 ton CO2/ha. Cadangan karbon Hutan Kota Sukapura tergolong sedang dengan nilai 71,79 ton C/ha dengan kemampuan serapan CO2 sebesar 263,46 ton CO2/ha., Urban forest as part of green open space in urban space plays an important role in climate change mitigation. The purpose of this study is to identify, describe, and analyze the composition of two different urban forest stand and to measure the carbon stock potential of two different urban forests in Jakarta: Sangga Buana Urban Forest and Sukapura Urban Forest. Measurement of carbon stock is done using non-destructive method with allometric equation, along with necromass estimation from dead trees and tree litters. Result shows difference in composition between the two locations, whereas Breadfruit (Artocarpus altilis) is found to be the dominant species in Sangga Buana Urban Forest, and Mahogany (Swietenia macrophylla) is dominant in Sukapura Urban Forest. Sangga Buana Urban Forest shows high level of carbon stock potential with 124,56 ton C/ha and CO2 sequestration of 457,13 ton CO2/ha. Sukapura Urban Forest shows medium level of carbon stock potential with 71,79 ton C/ha and CO2 sequestration of 263,46 ton CO2/ha.
Keyword: alometrik, emisi, perubahan iklim, ruang terbuka hijau, sekuestrasi

Judul: Analisis cadangan karbon pohon pada lanskap hutan kota di DKI Jakarta
Abstrak: In order to reduce enviromental problem, such as air polutions and increasing of air temperature in DKI Jakarta caused the presence of urban forest is very neccessary. Tree has an inportant role becouse its function as store carbon and most efficient carbon sinks in urban areas. Urban forest in DKI Jakarta has problems in development, beside technical aspects are also affected by the goverment policy. The objectives of research were (1) to analyze tree carbon stock, CO2 sequestration and tree species that have potential of carbon, and (2) to analyze policies that support the development of urban forest. The study was conducted at DKI Jakarta, which was focused on tree urban forests, i.e. University Indonesia (Jakarta Selatan), Srengseng (Jakarta Barat) and PT JIEP (Jakarta Timur). The research location was determined by using purposive sampling method, which is based on the representation of the main functions of the urban forest landscape services. Data was collected through survey method. The selection of respondents was conducted by purposive sampling. Sampling plots determination was done by purposive sampling method. Square plot with a size of 20 m x 20 m is used in this research. Determination of tree biomass is done by non-destructive sampling method and tree carbon stocks by using biomass content formula. CO2 uptake values was determined by using the comparative of relative molecular mass CO2 : 3.67 x carbon stocks. Wood density obtained from the database of wood density of trees world agroforestry. Carbon stock analysis was calculated by using allometric equation and urban policy analysis was executed by Analytical Hierarchy Process (AHP) approach. The largest tree carbon stocks were found on UI urban forest was 178.82 ton/ha, Srengseng was 24.04 ton/ha and PT JIEP was 23.64 ton/ha. The largest CO2 uptake generated from UI urban forest was 634.40 ton/ha, Srengseng was 88.15 ton/ha and PT JIEP was 86.76 ton/ha. Factors that affecting the enhancement of carbon stocks, i.e. stem diameter, tree density and the age of the trees. CO2 uptake value resulting from the biggest urban forest UI was 634.40 ton/ha, followed by Srengseng 88.15 ton/ha and PT JIEP 86.76 ton/ha. This information illustrates that in addition for conservation of biodiversity, water uptake and aesthetics landscape, urban forest also has the potential in reducing CO2. Tree of fabaceae family, i.e. Acacia crassicarpa A.Cunn.Ex.Benth, Acacia mangium Willd, Paraserianthes falcataria L, Leucaena leucocephala L, Bauhinia purpurea L, Delonix regia Boj Ex.Hook, Pterocarpus indicus Willd, Erythrina crista-galli L and Abrus precarorius are found that they have biggest contribution for tree carbon stocks in study sites. Policy priorities the supporting the development of urban forest in level factor are increasing of urban forests quality, level actor are government and level alternative are rules evaluation and urban forest expantion.
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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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