Judul: Kajian Ekologi Tumbuhan Langka Rotan Beula Ceratolobus glaucescens Blume di Cagar Alam Sukawayana Sukabumi Jawa Barat
Abstrak: Indonesian forest possesses a huge number species of plants. Among those plants, there is a species of rattan, called Rotan Beula (Ceratolobus glaucescen Blume), has been protected by Indonesian Government through Governmental Regulation (Peraturan Pemerintah) No.7/1999 about Preservations of Flora and Fauna Species. Sustainability of Rotan Beula should be kept through various efforts. One of efforts to keep the sustainability of this rattan is conducting the ecological study of Rotan Beula. The aims of this study is to determine the structure, composition, and diversity vegetation which grows at habitat of rotan beula; to know the population condition of rotan beula; and to identify the ecological factors of rotan beula. Sample units were made by using purposive sampling method at every place which is grown by rotan beula. The form of each sample unit is circular plot. The width of circular plot for trees and poles were 0.1 ha, for sapling were 0.01 ha, and for seedlings were 0.001 ha. The data that were collected are biological and physical factors of rotan beula. The processing and analysis of data was done using Minitab's program version 14 . Vegetation structure at the habitat of rotan beula consisted of fledged strata (A=1.18%, B=2.29%, C=8.87%, D=26.67% and E=60.98%). Vegetation composition at habitat of rotan beula was dominated by teureup (Artocarpus elastica) (Importance Value Index [IVI]=26.5%) for tree level, heucit (Baccaurea javanica) (IVI=31.95%) for pole level, patat (Phrynium capitatum) (IVI=28.44%) for sapling level, and Derris trifoliate (IVI=38.95%) for seedling level. The vegetation richness at habitat of rotan was 8.79 for tree level, 7.58 for pole level, 7.12 for sapling level, and 3.77 for seedling level. The variety index for level of tree, pole, sapling, and seedling respectively was 3.43; 3.31; 3.33; and 2.87. Rotan beula is supported by physical factor such as relative humidity of air (71-95%), air temperature (26-320C), optimum pH (6.5-6.8), Ca (4.06-10.67 me/100 g), Mg (2.77-6.14 me/100 g), K (0.72-1.32 me /100 g), Na (0.66-1.3 me/100 g), N (0.09-0.14%), S (2.65-4.24 ppm), P (3.4-5.7 ppm) and litter's depth was 1-2 cm. The condition of rotan beula populations are well, they still grow normally. This conditions was described with young age (446 individuals) is more than the total of Rotan beula in old age (162 individuals). The sustainability of rotan beula’s population at Sukawayana Natural Reserve (SNR) was being threatened by society activity surround the SNR. The density of Rotan beula was affected by density of pole level (n=7; t=7.81; p=0.001) and relative humidity of air (n=7; t=12.10; p=0.000). It can be formulated with regression: rotan beula density = -1155 + 0.154 density of pole + 13.9 relative humidity of air.
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Judul: Ekologi Dan Etnobotani Rotan Pada Masyarakat Suku Anak Dalam Di Taman Nasional Bukit Duabelas, Jambi
Abstrak: Rotan merupakan jenis tumbuhan suku Arecaceae yang memanjat dan merambat, serta memiliki duri di setiap ruas. Masyarakat Suku Anak Dalam (SAD) bermukim di dalam hutan Taman Nasional Bukit Duabelas (TNBD) memanfaatkan rotan sebagai bahan kerajinan, obat, makanan tambahan, pewarna kerajinan, ritual, pengawet, tali temali dan sumber penghasilan. TNBD merupakan kawasan pelestarian hutan berkaitan kearifan lokal SAD. Informasi pemanfaatan rotan dan kearifan lokal SAD belum banyak diketahui masyarakat umum, sehingga penelitian ini bertujuan mengkaji komposisi jenis rotan, pohon inang, karakter edafik habitat rotan, dan strategi konservasi, menginventarisasi jenis rotan serta mengkaji kearifan lokal SAD memanfaatkan rotan. Penelitian dilakukan di kawasan zona pemanfaatan TNBD Sarolangun Jambi bulan April-Juni 2014. Analisis vegetasi rotan dan inang menggunakan metode nested sampling. Pengumpulan data etnobotani dilakukan melalui wawancara mendalam, observasi partisipasi aktif dan dokumentasi menggunakan teknik snowball sampling. Identifikasi rotan di Herbarium Bogoriense Lembaga Ilmu Pengetahuan Indonesia (LIPI) Cibinong. Identifikasi tanah di Laboratorium Departemen Ilmu Tanah dan Sumberdaya Lahan Fakultas Pertanian IPB Dramaga Bogor. Analisis data dengan indeks nilai penting, indeks asosiasi, dan indeks kepentingan budaya. Karakteristik edafik mencirikan keberadaan rotan ditentukan dengan metode Analisis Komponen Utama dan kemiripan karakteristik edafik antar habitat rotan dengan analisis Hirarki Gabungan Klaster (HGK) menggunakan software XLSTAT 2014. Hasil penelitian menyatakan terdapat 22 jenis rotan dimanfaatkan masyarakat SAD yaitu Calamus ornatus (Blume), C. caesius (Blume), C. flabellatus (Becc.), C. manan (Miq.), C. trachycoleus (Becc.), C. diepenhorstii (Miq.), C. csipionum (Lour.), C. hispidulus (Becc.), C. javensis (Blume), C. retrophyllus (Becc.), C. cf. Ciliaris (Blume), C. zonatus (Becc.), C. axilliaris (Becc.), Calamus sp. 1, Calamus sp. 2, Daemonorops geniculata (Griff.) Mart., D. draco (Willd.) Blume, D. brachytachys (Furt.), D. verticiliaris (Griff.) Mart., Korthalsia echinometra (Becc.) dan K. Rosrata (Blume). Jenis yang mendominasi zona pemanfaatan adalah D. geniculata (INP=21,49%), C. ornatus (INP=17,45%), C. caesius (INP=16,51%). Analisis komponen utama menunjukkan keberadaan K. echinometra lebih dicirikan rasio C/N (14,19%) dan KTK (22 me/100g). Keberadaan C. manan kuat dicirikan oleh C-org (4,94%), dan D. draco serta C. ornatus dicirikan oleh pasir (63,34% dan 63,22%). Analisis hirarki gabungan klaster menunjukkan kemiripan karakteristik edafik C. caesius dan C. trachycoleus pada kandungan K (0,10-0,18 me/100g) dan persentase debu (26-30%). C. ornatus dan D. draco memiliki kemiripan karakteristik edafik pada persentase KB (7-8%), KTK (11-12%), Mg (0,20-0,22 me/100g), K (0,14-0,15 me/100g), Na (0,1-0,11 me/100g), S (71-72%), dan tekstur tanah lempung liat berpasir. Pertumbuhan rotan didukung oleh keberadaan inang sebagai penunjang. Jenis inang mendominasi di zona pemanfaatan adalah Litsea tomentosa (INP=13,31%), Artocarpus elasticus (INP=11,73%) dan Palaquium gutta (INP=10,75%). Jenis D. draco sangat berguna bagi masyarakat SAD karena getah buahnya digunakan untuk pewarna kerajinan, obat sakit kepala, demam, diare dan luka, sehingga jenis tersebut memiliki ICS berkategori tinggi (60). Selanjutnya untuk pelestarian rotan, masyarakat SAD menetapkan dua kebijakan adat yaitu kebijakan pemanfaatan rotan dan pengelolaan habitat rotan. Strategi konservasi Calamus sp.2, C. ornatus, C. caesius D. geniculata dan K. echinometra yaitu dengan mempertahankan habitat dan meningkatkan intensitas pemanfaatan, karena jenis tersebut memiliki INP tinggi dan ICS rendah. C. flabellatus, C. manan, C. javensis, C. scipionum dan D. draco perlu strategi konservasi dengan mempertahankan habitat dan intensitas pemanfaatan, karena INP dan ICS mereka tinggi. C.
Keyword: ekologi, etnobotani, rotan, Suku Anak Dalam

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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