Judul: Kualitas Tanah pada Sistem Silvikultur Tebang Pilih Tanam Jalur di Areal IUPHHK-HA PT. Suka Jaya Makmur Kalimantan Barat
Abstrak: Sistem silvikultur tebang pilih tanam jalur (TPTJ) merupakan salah satu upaya pengelolaan hutan alam untuk mencapai keberlanjutan fungsi produksi, ekologi dan sosial. Kegiatan pengelolaan hutan alam dapat menyebabkan perubahan lingkungan salah satunya adalah perubahan kualitas tanah. Pengujian kualitas tanah diperlukan untuk mengetahui pengaruh penerapan sistem silvikultur TPTJ terhadap kualitas tanah. Sampel tanah pada penelitian ini diambil pada kedalaman 0–20 cm dengan dua metode yaitu pengambilan sampel tanah terganggu dan sampel tanah utuh. Sampel tanah diambil di jalur tanam dan di areal buffer zone sebagai gambaran kualitas tanah pada hutan alam primer. Sampel tanah dianalisis di laboratorium dan hasilnya dimasukkan ke dalam persamaan yang digunakan. Hasil analisis yang diperoleh menunjukkan kualitas tanah pada areal yang diterapkan TPTJ tergolong dalam kategori sedang yaitu pada kisaran 4.416–5.927 dan pada areal buffer zone kualitas tanah yang diperoleh yaitu 4.191 yang juga tergolong sedang. Berdasarkan data yang diperoleh dapat disimpulkan bahwa tidak ada perbedaan kualitas tanah antara buffer zone dengan areal TPTJ.
Keyword: kualitas tanah, sistem silvikultur, TPTJ

Judul: Kualitas tanah pada sistem silvikultur tebang pilih tanam jalur(TPTJ) di areal kerja IUPHHK/HA PT. Sari Bumi Kusuma provinsi Kalimantan Tengah
Abstrak: Rapid forest exploitations can cause forest degradation, and eventually may cause the global climate change, because of that, the balance of the forest sustainability must be kept as well. The implementation of silviculture system called Selective Cutting and Strip Planting System is one of several forest harvesting method that consider the importance of forest sustainability. Practically, the system has never been tested to the last cycle. So, it is necessary to conduct some evaluation to the method to assure its sustainability. Estimation of soil quality is one of several ways to evaluate the effectiveness of silviculture implementation on a forest area, Since the soil is one of the major factor that influencing the growth of vegetations, then its quality can be used as an indication of conservation of forest productivity. In this research, the soil sampling was done in the forest area of PT. Sari Bumi Kusuma, on class of 1-9 years cultivation age, on May 22-31 2009. The sampling method being used is purposive sampling on the plot with size of 100 m x 100 m, selected purposively based on the same physical characteristic, in each class age on the intermediate block and planting strip to the depth of 0-20 cm and 20-40 cm. The sample is then analyzed with statistic method called ANOVA, to compare the mean value, and then the research data was scored based on Pamoengkas (2006). The result from scoring was then substituted into the formula developed by Pamoengkas (2006), and finally grouped into several categories developed by Pamoengkas (2006). The result of this research is the founding of two categories of soil quality value in the forest area of PT Sari Bumi Kusuma. One is Medium Category (1, 2, 4, 5, 8, and 9 years of cultivation age), and the other is Low Category (3, 6, and 7 years of cultivation age). Those differences might be due to unpredictable factors which have created non-uniform environment conditions of the research area, and those environment conditions have influenced the development of parameters which affecting the soil quality.
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Judul: Penyelesaian Numerik Persamaan Schrödinger untuk Molekul BaO dan SrO Menggunakan Model Potensial Morse
Abstrak: Morse potential is a potential model used to describe the behavior of a molecular vibration between atoms. This study aimed to obtain the value of the dissociation energy, the energy eigenvalues of each energy level, and describe the shape of the wave function of the molecule BaO and SrO on the vibrational state. Dissociation energy is calculated by adding the experimental dissociation energy and the ground state energy eigenvalues. Calculating the energy eigenvalues of the energy levels 0 to 4 using shooting method integrated with Numerov and Runge-Kutta method. Energy eigenvalues of each levels that calculated numerically having accuracy of 100% compared with the calculated analytically. The profil of wave functions accurately show the corresponding states and their normalized wavefunctions.
Keyword: SrO, Morse potential, energy eigenvalues, dissociation energy, BaO