Judul: Keanekaragaman Fabaceae di Kampus Dramaga IPB University dan Potensinya sebagai Sumber Pakan Lebah Madu
Abstrak: IPB University merupakan salah satu kampus biodiversitas di Indonesia, sebagian dari area di Kampus Dramaga terdiri atas vegetasi hijau dengan komposisi berbagai jenis tumbuhan berbunga (Angiospermae), di antaranya suku Fabaceae. Banyak jenis tumbuhan dari suku Fabaceae memiliki hubungan mutualiastik dengan serangga, seperti lebah, yang membantu penyerbukkan dengan menyediakan pakan berupa polen dan nektar. Inventarisasi jenis-jenis tumbuhan Fabaceae dan potensi pemanfaatannya di Kampus Dramaga IPB University belum pernah dilakukan. Penelitian ini bertujuan menginventarisasi tumbuhan suku Fabaceae di Kampus Dramaga IPB, membuat peta persebarannya, dan mengamati serta menelusuri potensinya sebagai sumber pakan lebah madu. Pengamatan di lapangan dilakukan menggunakan metode eksplorasi, lokasi koordinat keberadaan jenis-jenis Fabaceae dicatat dalam tabel dan dibuat peta sebaran menggunakan software Arcgis. Data potensi sebagai pakan lebah diperoleh dari pengamatan struktur bunga dan keberadaan kelenjar nektar, serta penelusuran pustaka. Berdasarkan inventarisasi didapatkan 25 jenis tumbuhan Fabaceae, meliputi jenisjenis liar dan ditanam, dari herba, semak, pemanjat, hingga pohon. Sebaran Fabaceae di kampus Dramaga IPB dijumpai di taman, pekarangan, kebun, dan hutan kampus (arboretum). Sebanyak 17 jenis dari suku Fabaceae yang dijumpai berpotensi sebagai pakan lebah madu, menyediakan polen dan nektar, beberapa diantaranya juga menghasilkan resin yang diperlukan lebah tanpa sengat untuk membuat sarang.
Keyword: Flora campus, bee forage plant, nectar source plant, pollen source plant, resin source plant

Judul: Keanekaragaman dan Kegunaan Spesies Tumbuhan Bawah di Tegakan Sawit Kebun Percobaan Cikabayan Kampus IPB Darmaga
Abstrak: Tumbuhan bawah yang tumbuh dibawah tegakan tanaman kelapa sawit sering kali dianggap merugikan. Pengetahuan masyarakat terkait pemanfaatan tumbuhan bawah yang ada di tegakan kelapa sawit perlu dikaji dan didokumentasikan agar ada tindak lanjut pemanfaatan. Penelitian ini bertujuan untuk mengidentifikasi keanekaragaman serta kegunaan spesies tumbuhan bawah yang ada di tegakan kelapa sawit kampus IPB Darmaga sebelum dan sesudah dilakukan pemupukan. Metode penelitian ini dilakukan dengan analisis vegetasi dan studi literatur. Keanekaragaman spesies tumbuhan bawah yang ditemukan sebanyak 82 spesies yang berasal dari 36 famili. Kegunaan spesies tumbuhan terdiri dari tumbuhan pangan, tumbuhan obat dan tumbuhan hias. Manfaat spesies tumbuhan yang paling banyak adalah sebagai tumbuhan obat.
Keyword: species diversity, undergrowth, utility

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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