Judul: Habitat Analysis of Kulim (Scorodocarpus borneensis Becc.) In the Core Zone and Jungle Zone of Tesso Nilo National Park, Riau
Abstrak: Taman Nasional Tesso Nilo ditetapkan sebagai kawasan pelestarian alam berdasarkan Surat Keputusan Menteri Kehutanan RI Nomor SK.6588/Menhut-VII/KUH/2014, dengan luas 81.793 ha. Penelitian ini bertujuan untuk mengidentifikasi habitat Kulim (S. borneensis) meliputi komponen biotik dan abiotik. Habitat kulim berada di tanah lempung berpasir dan pasir berlempung yang berwarna cokelat kekuningan dengan kadar air rata-rata 28,19 dan pH 4,25 (asam). Komponen habitat kulim di Taman Nasional Tesso Nilo Riau meliputi kisaran ketinggian 40 mdpl - 118 mdpl, topografi agak landai hingga terjal, suhu rata-rata 27,31 ˚C, kelembaban 86,92 % dan intensitas cahaya berkisar 208,75 – 2.960,25 Lux. Dominansi vegetasi di sekitar kulim oleh vegetasi semai, pancang, tiang dan pohon adalah jenis Kelat merah (Syzygium claviflorum) dengan INP 34,425%; 15,986%; 22,382%; dan 29,741%. Pohon kulim di kawasan Taman Nasional Tesso Nilo memiliki indeks kekayaan yang tergolong tinggi dan indeks keanekaragaman tergolong sedang hingga tinggi. Jenis yang terdapat dalam komunitas tumbuhan di habitat kulim tersebar merata., Tesso Nilo National Park is a nature conservation area based on the Decree of the Minister of Forestry of the Republic of Indonesia SK. Number 6588 / Menhut-VII / KUH / 2014, with an area of 81.793 ha. This study aims to identify the habitat of Kulim (S. borneensis) including biotic and abiotic components. The habitat of kulim is in sandy loam soils and loamy sand which is yellowish brown with an average water content of 28.19 and a pH of 4.25 (acid). The abiotic component of the culm in Tesso Nilo National Park includes an altitude range of 40 masl - 118 masl, a slightly sloping to steep topography, an average temperature of 27.31˚C, a humidity of 86.92% and a light intensity ranging from 208.75 to 2 960.25 Lux. The dominance of the vegetation around the culms by the vegetation of seedlings, saplings, poles and trees was the type of red chelate (Syzygium claviflorum) with an IVI value of 34.425; 15.986; 22.382; and 29.741. Kulim tree in the Tesso Nilo National Park area has a relatively high wealth index and a moderate to high diversity index. The species found in the plant community in the kulim habitat are evenly distributed.
Keyword: habitat, kulim, TNTN

Judul: Kajian Permudaan Tumbuhan Langka Kulim (Scorodocarpus borneensis Becc.) dan Komposisi Vegetasi Pohon Sekitarnya di Taman Nasional Tesso Nilo, Riau
Abstrak: Kulim (Scorodocarpus borneensis Becc.) is one of Indonesia wood species which have high economic value. This species is widely used by people in Bagan Siapi-api the Province of Riau for ship and building materials (Ismail 2000). Kulim is categorized as strong and long lasting wood. Unfortunately, this species of wood is rare to be found in the nature due to habitat disturbance. The aims of this research are to the population condition identify, the young level of kulim, the structure and composition of vegetations surround kulim‟s natural habitat. The vegetation data was collected through plot sampling using combination between strip and quadrate sampling techniques (20 m x 500 m). The total of transec was 5 and it was allocated systematically at every 100 m far from the location kulim found. Trees analysis was undertaken in 20m x 20m of square in every line, at the pole 10m x 10m, at the sapling 5m x 5m and the seedling 2m x 2m. The total of sampling units were 125 plots. The crown stratification was made through drawing 20 m x 100 m line. The data then was analyzed descriptively and quantitatively using vegetation analysis formulas. The formulas were aimed to get Important Value Index (IVI), Evennes Index and Diversity Index. Kulim has density at seedling level of 180 ind / ha, at saplings 35 ind / ha, at the pole 8 ind / ha, while the value at the tree level 2 ind / ha. High amount of Kulim found in diameter classes <10 cm of 20 individuals. It has been found as many as 28 species of tree-level, 24 species on the pole and stake, and 21 in 14 species of seedlings. Middle species diversity index value of 2.95 obtained, whereas equitable distribution of the species seen from the index value close to 1. There are A and B strata header with average height ranges from 20-40 meters. Kulim has strata header with average height ranges from 15-20 meters. Based on this research, Kulim population in TNTN heading to extinction. It‟s caused by the uncontrolled logging in the past. It can be seen by the number of logged-over Kulim‟s stump on this area. It‟s reasonable that Vegetation structure in Kulim habitats dominated by stands of young trees with average stem diameters ranging from 20-30 cm. there is low composition of habitus on research plots that only contain 32 species of tree composition.
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Judul: Pemodelan Harga Saham Menggunakan Model Lévy dan Model Black-Scholes
Abstrak: Stock may produce high profits. However, it has a high risk as well, because the stock prices fluctuate over time. Therefore, a model is required to estimate the future stock prices accurately. In this paper, Lévy model is compared to Black-Scholes model in estimating the stock price at Bank of America Corporation. As a result, it is concluded that the Black-Scholes model is more accurate than Lévy model.
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