Judul: Struktur dan Komposisi Jenis Pohon di Taman Hutan Raya Bunder, Gunung Kidul, Daerah Istimewa Yogyakarta
Abstrak: Taman Hutan Raya (Tahura) Bunder merupakan kawasan pelestarian alam yang memiliki potensi pengembangan yang menjanjikan, jika dilihat dari komponen lingkungan biotic (biodiversitas) dan abiotic (biofisik). Akan tetapi informasi dasar mengenai struktur dan komposisi jenis tegakan di Tahura tersebut masih kurang memadai, khususnya terkait keanekaragaman tegakan. Oleh sebab itu, pada tahap awal perlu dilakukan kajian mengenai struktur dan komposisi tegakan yang dapat menggambarkan keragaman jenis maupun kondisi populasi yang dapat digunakan untuk menunjang kegiatan konservasi. Penelitian ini bertujuan untuk mengkaji struktur dan komposisi tegakan yang berada di Tahura Bunder Gunung Kidul, Yogyakarta yang secara khusus terkait dengan kondisi pertumbuhan dan beberapa faktor lingkungan yang mempengaruhinya. Kegiatan penelitian di lapangan meliputi: i) pengumpulan data primer melalui (analisis vegetasi dan analisi tanah) dan ii) pengumpulan data sekunder akuisisi ( data curah hujan dan studi literatur). Komposisi tegakan pada plot penelitian di Tahura Bunder terdiri dari 8 jenis pohon, yaitu akasia, mahoni, jati, namnam, kemiri, angsana, sengon, dan daun kupu-kupu. Keanekaragaman jenis tanaman di Tahura Bunder termasuk ke dalam kategori rendah. Status tersebut dapat dipengaruhi oleh faktor lingkungan seperti adanya serangan penyakit dan kondisi tempat tumbuh dalam hal ini antara lain iklim dan jenis tanah. Struktur vegetasi di Tahura Bunder tersusun dalam strata A, strata B, dan strata C. Pada strata A terdiri dari pohon akasia, strata B terdiri dari pohon akasia, mahoni, jati, kemiri, angsana, dan daun kupu-kupu, dan strata C terdiri dari pohon mahoni, namnam, akasia, kemiri, angsana, dan sengon. Jenis tanaman yang medominasi pada keseluruhan jalur adalah akasia pada jalur 7 dengan INP sebesar 271.59%.
Keyword: Faktor lingkungan, INP, komposisi, struktur vegetasi

Judul: Komposisi Jenis dan Struktur Tegakan Hutan di Taman Nasional Gunung Ciremai, Jawa Barat
Abstrak: INTRODUCTION. The existence of forest as an ecosystem is important for life supporting system. This is because the forest produces various benefits, either in the form of services or goods which are very useful for life. In West Java, as in other parts of Indonesia, forests which are still having relatively good condition, are found only in conservation areas. One of the forest conservation areas which is relatively large is Gunung Ciremai National Park (TNGC). The TNGC constitutes a nature conservation area which possesses important ecological function as life supporting system for the surrounding ecosystem. However, information concerning the existing biodiversity in TNGC is still lacking. Therefore, there is a need for more studies to obtain information on biodiversity level and forest composition and structure in TNGC. METHODOLOGY. This study was conducted from August through September 2008 in altitude zones of < 1.000 m above sea level (asl) (lowland zone), 1.000 – 2400 m asl (montane zone), and > 2.400 m asl (sub alpine zone) in Gunung Ciremai National Park, West Java. This study was performed by using vegetation analysis technique which constitutes combination between strip method for tree stage vegetation inventory and plotted line method for forest regeneration inventory. To ease the inventory process, each strip was divided into plots of 20 m X 20 m for tree stage vegetation inventory, 10 m X 10 m for pole stage inventory, 5 m X 5 m for sapling stage inventory, and 2 m X 2 m for seedling stage inventory. Units of vegetation sample plot were placed in west and south slope directions at altitude zones of < 1.000 m asl, 1.000 – 2.400 m asl, and > 2400 m asl. In each slope direction, two sample units with strip length of 200 m and width of 20 m were established. Sampling units were placed in the field with sampling design of systematic sampling with random start. RESULTS AND CONCLUSION. Sub alpine zone exhibited the least number of species (11 species) at all growth stages, as compared with those of montane zone (62 species) and lowland forest zone (58 species). The number of species in the montane zone was relatively greater as compared with that of lowland forest zone. In lowland zone, the dominant species were huru meuhmal (Litsea tomentosa) at seedling stage (IVI 33,7 %), kileho (Saurauia pendula) at sapling stage (IVI 29,3 %), and pine (Pinus merkusii) at pole and tree stages (IVI 144,7 % and 112.8 %). In the montane zone, the dominant species were huru meuhmal (Litsea tomentosa ) at seedling stage (IVI 22,6 %), Litsea sp. at sapling stage (IVI 19,4 %), walen (Ficus ribes) at pole stage (IVI 32.6 %) and saninten (Castanopsis argentea) at tree stage (IVI 45,4 %). At sub alpine zone, the dominant species was plending (Leucaena glauca) at seedling and sapling stages (IVI 64 % and 76,4 %), cantigi (Vaccinium varingifolium) at pole stage (IVI 124,3 %), and jamuju (Dacrycarpus imbricatus) at tree stage (IVI 138,3 %). Index of species diversity (H’) for all elevation zones in TNGC were categorized as high
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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