Judul: Konservasi Ex-situ Bambu Sembilang (Dendrocalamus giganteus Munro) Di Arboretum Bambu Kampus Darmaga
Abstrak: Bogor Agricultural University has a bamboo Arboretum that was planted the species of sembilang (Dendrocalamus giganteus Munro). The quantity of sembilang in there only one clumps. Condition of sembilang in bamboo Arboretum has many damages that caused by cutting of clump and taking of rhizome that have done with wrong technique. If the bamboo wasn’t taken care, this species will to go through disturbed. This case was the reason to identify the physic condition, damage factor and make conservation program of sembilang at bamboo arboretum of campus darmaga. This research was conducted from November to December 2011 at bamboo Arboretum of campus darmaga. Materials that collected was bio ecology of sembilang, analysis clumps of bamboo, identification of damage and species experiment cultivation. The materials were collected by qualitative analysed based on calculation of the growth of clump, damage of clump, total of bud and rhizome that was taken. So, the condition clumps of bamboo will be known if the condition was good or bad. Clump of sembilang which grow is 6 clumps and 32 clumps are damage. The clumps damage were caused by breaking, that is 3 (9%), and by cutting, that is 29 (91%). The growth of rhizome was not found in bamboo arboretum. This case is mean that clumps of sembilang at bamboo arboretum has high damage, so clumps of sembilang can’t do regenerate process. The physic condition of sembilang at bamboo arboretum of campus darmaga has high damage. This condition caused clump of sembilang which grow was 6 clumps and rhizome’s growth was not found. That damages are caused by human and environment factor. For decreasing the damage, must to do conservation program which based on damage sources. The concervation program can used by fertilizing with giving some fertilizer, cleaning clumps of bamboo and surrounding, cultivating of individu, setting of fence and interpretation board.
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Judul: Ex-situ Conservation of Thorny Bamboo (Bambusa blumeana J.A. & J.H. Schultes) in Bamboo Arboretum of Darmaga Campus.
Abstrak: Bambu duri (Bambusa blumeana J.A. & J.H. Schultes) ditetapkan sebagai 12 spesies bambu langka yang merupakan indikator priotitas di Indonesia. Bambu duri merupakan tumbuhan konservasi karena memiliki fungsi ekologi dan sebagai penyangga sistem hidrologi. Arboretum Bambu Kampus Darmaga memiliki koleksi bambu duri yang kondisinya tidak banyak diketahui. Tujuan penelitian ini adalah untuk mengidentifikasi kerusakan pada rumpun bambu duri, mengidentifikasi faktor penyebab kerusakan rumpun bambu duri serta merumuskan program (upaya) konservasi ex-situ untuk melestarikan spesies bambu duri. Penelitian ini diharapkan dapat memberikan informasi mengenai keberadaan bambu duri di Arboretum Bambu Kampus Darmaga serta pelestarian bambu duri khususnya di dalam program konservasi ex-situ sehingga konservasi bambu duri ini lebih ditingkatkan. Lokasi penelitian dilaksanakan di Arboretum Bambu Kampus Darmaga dengan waktu penelitian selama 1 bulan yakni pada bulan November s/d Desember 2011. Jenis data yang dikumpulkan yakni data primer dan data sekunder. Data primer meliputi karakter morfologi bambu duri, jumlah rumpun, kondisi rumpun bambu duri (buluh dan rebung) dan program konservasi ex-situ. Data sekunder diperoleh melalui studi literatur meliputi kondisi fisik lokasi penelitian, morfologi bambu duri, karakterisitik pertumbuhan bambu duri dan program (upaya) konservasi untuk mengurangi kerusakan bambu duri. Analisis data dilakukan secara deskriptif kualitatif. Hasil penelitian menunjukkan bambu duri di Arboretum Bambu Kampus Darmaga hanya memiliki 1 rumpun bambu dengan total jumlah buluh sebanyak 49 buluh, 20 buluh yang masih hidup (4 anakan) dan 29 buluh yang patah. Kerusakan yang terjadi diakibatkan oleh faktor lingkungan (persaingan interspesifik, jarak rumpun dan angin kencang) dan faktor manusia (kurangnya pemeliharaan). Rebung muda yang hidup hanya terdapat 1 rebung muda. Kurangnya pertumbuhan rebung muda dapat disebabkan oleh faktor kurangnya zat-zat makanan atau nutrisi yang didapatkan oleh bambu duri dan tidak adanya pemeliharaan yang intensif. Oleh sebab itu diperlukannya program konservasi exsitu untuk membudidayakan spesies bambu duri. Program konservasi ex-situ dapat dilakukan dengan perbanyakan vegetatif (stek batang dan stek cabang), penyiangan, pemasangan pagar, pembuatan dan pemasangan papan interpretasi, kultur jaringan (in-vitro), penyiraman, pembersihan gulma, pemupukan serta pemberantasan hama dan penyakit. Kesimpulan dari penelitian ini bahwa kondisi rumpun bambu duri mengalami kerusakan yang disebabkan oleh berbagai faktor dan untuk mengatasi kondisi tersebut diperlukan program konservasi.
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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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