Judul: Komposisi Jenis dan Struktur Vegetasi Hutan Mangrove di Suaka Margasatwa Muara Angke, Jakarta Utara
Abstrak: Hutan mangrove Suaka Margasatwa Muara Angke (SMMA) merupakan kawasan penyangga kehidupan di DKI Jakarta yang memerlukan penjagaan dari kerusakan. Informasi struktur dan komposisi jenis hutan mangrove dapat membantu pengelolaan berkelanjutan. Penelitian ini bertujuan mempelajari komposisi jenis dan struktur vegetasi hutan mangrove di SMMA. Analisis vegetasi dilakukan menggunakan metode grid dengan luasan yang diamati seluas 6.800 m2 berjumlah 17 petak dengan ukuran setiap petak 20 x 20 m. Penelitian ini menunjukkan bahwa hutan mangrove SMMA memiliki 26 jenis tumbuhan penyusun dari 21 famili. Jenis Sonneratia caseolaris dan Rhizophora mucronata mendominasi pada pohon dan permudaannya, Brachiaria mutica pada tumbuhan bawah, serta Nypa fruticans mendominasi palem-paleman. Nilai keanekaragaman dan indeks kekayaan jenis hutan mangrove SMMA tergolong rendah. Indeks dominansi hutan mangrove SMMA pada pohon dan palem tergolong tinggi, semai dan tumbuhan bawah tergolong sedang, dan pancang tergolong rendah, sedangkan kemerataan jenis pada pohon, pancang, dan tumbuhan bawah tergolong sedang, dan semai dan palem-paleman tergolong rendah. Struktur horizontal hutan mangrove membentuk kurva J terbalik, sedangkan struktur vertikal membentuk lapisan stratum C dan stratum D., Muara Angke Wildlife Reserve (SMMA) mangrove forest is the buffer zones for DKI Jakarta which requires protection from damage. Information of mangrove forest structure and species composition can assist sustainable management. This study aims to study species composition and vegetation structure of SMMA mangrove forest. Vegetation analysis was carried out by the grid method with an observed area of 6.800 m2 totaled 17 plots with a size of each quadrat 20 x 20 m. This study shows that the results of SMMA mangrove forest has 26 species from 21 families. Species Sonneratia caseolaris and Rhizophora mucronata dominate the level of trees and the regeneration, Brachiaria mutica of undergrowth, with Nypa fruticans dominate palms. The diversity and species richness index of SMMA mangrove forest was low. The dominance index on trees and palms were high, while seedlings and undergrowth were moderate, and on saplings were low, while the species evenness index on trees, saplings, and undergrowth was moderate, and for seedlings and palms low. For the horizontal structure of mangrove forest forms an inverted J-curve, while the vertical structure forms stratum C and stratum D.
Keyword: analisis vegetasi, hutan mangrove, Suaka Margasatwa Muara Angke

Judul: Species Composition and Vegetation Structure of Mangrove Forest in Pulau Rambut Wildlife Reserve, Kepulauan Seribu, DKI Jakarta
Abstrak: Hutan mangrove di Suaka Margasatwa Pulau Rambut memiliki keanekaragaman hayati yang tinggi sehingga diperlukan penelitian mengenai komposisi jenis dan struktur vegetasi. Penelitian ini bertujuan untuk mengkaji komposisi jenis dan struktur vegetasi hutan mangrove di Suaka Margasatwa Pulau Rambut. Analisis vegetasi dilakukan dengan metode jalur dan garis berpetak dengan luasan plot contoh 8000 m2 dan berjumlah 8 jalur masing-masing dengan ukuran 10m x 100 m. Hasil penelitian menunjukkan bahwa hutan mangrove Suaka Margasatwa Pulau Rambut memiliki 9 jenis dari 5 famili dan didominasi oleh famili Rhizophoraceae. Jenis Rhizophora mucronata mendominasi pada tingkat pertumbuhan pohon dan semai. Jenis Ceriops tagal mendominasi pada tingkat pertumbuhan pancang. Nilai keanekaragaman, kekayaan, dan dominansi di hutan mangrove Suaka Margasatwa Pulau Rambut pada berbagai tingkat pertumbuhan tergolong rendah, namun nilai kemerataan jenisnya tergolong tinggi. Proporsi jumlah pohon dan permudaan membentuk kurva “J” terbalik. Stratifikasi tajuk pada hutan mangrove SM Pulau Rambut hanya mencapai stratum C (4-20 m)., Mangrove forest in Pulau Rambut Wildlife Reserve has high biodiversity, so research is needed on species composition and vegetation structure. This study aims to examine the composition of the type and structure of mangrove forest vegetation in the Pulau Rambut Wildlife Reserve. Vegetation analysis was carried out using the strip and line method with a sample plot area of 8000 m2 and a total of 8 lanes each with a size of 10 m x 100 m. The results showed that the mangrove forest of Pulau Rambut Wildlife Reserve has 9 species from 5 families and is dominated by the Rhizophoraceae family. The type of Rhizophora mucronata dominates the growth rate of trees and seedlings. The type of Ceriops tagal dominated the sapling growth rate. The value of diversity, richness, and dominance in the mangrove forest of the Pulau Rambut Wildlife Reserve at various growth rates is low, but the value of species evenness is high. The proportions of the number of trees and regeneration form an inverted “J” curve. The canopy stratification in the mangrove forest of Pulau Rambut Wildlife Reserve only reached stratum C (4-20 m).
Keyword: mangrove forest, Rambut Island, species composition, vegetation structure

Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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