Judul: Pengaruh Struktur Tegakan terhadap Kelimpahan dan Kadar Air Bahan Bakar di Kawasan Konservasi PLTGU Cilegon
Abstrak: Struktur tegakan akan memengaruhi karakteristik bahan bakar pada tegakan hutan. Karakteristik bahan bakar hutan memiliki peran penting dalam menentukan perilaku api dalam kebakaran hutan. Tujuan penelitian ini adalah untuk mengetahui pengaruh struktur tegakan vegetasi terhadap kelimpahan dan kadar air bahan bakar yang memengaruhi peluang terjadinya kebakaran hutan di kawasan konservasi Pembangkit Listrik Tenaga Gas dan Uap (PLTGU) Cilegon. Analisis vegetasi dan pengukuran karakteristik bahan bakar dilakukan pada dua tegakan berbeda yaitu tegakan monokultur dan polikultur. Parameter yang digunakan untuk melakukan analisis vegetasi yaitu tinggi pohon, tinggi percabangan pertama, diameter setinggi dada dan penutup tajuk, sementara parameter karakteristik bahan bakar yaitu kelimpahan, ketebalan dan kadar air bahan bakar. Berdasarkan hasil penelitian karakteristik bahan bakar pada tegakan monokultur menghasilkan kelimpahan, ketebalan dan kadar air bahan bakar masing-masing sebesar 11,35 ton/ha, 15 cm dan 13,61%, sedangkan pada tegakan polikultur menghasilkan kelimpahan, ketebalan, dan kadar air bahan bakar masing-masing sebesar 14,57 ton/ha, 10 cm dan 16,46%. Kadar air pada tegakan monokultur dan polikultur berada di bawah nilai persentase 30% sehingga dua tegakan pada kawasan konservasi PLTGU Cilegon termasuk kawasan yang masih rawan terjadi kebakaran hutan., Stand structure will affect fuel characteristics in forest stands. Forest fuel characteristics have an important role in determining fire behavior in forest fires. The purpose of this study was to determine the effect of vegetation stand structure on the abundance and moisture content of fuels that affect the chances of forest fires in the Cilegon PLTGU conservation area. Vegetation analysis and measurement of fuel characteristics were conducted in two different stands, namely monoculture and polyculture stands. The parameters used to conduct vegetation analysis are tree height, first branch height, Diameter at Breast Height (DBH) and crown cover, while the parameters of fuel characteristics are abundance, thickness and moisture content of fuel. Based on the results of fuel characteristics research in monoculture stands resulted in abundance, thickness and moisture content of fuel respectively 11.35 tons/ha, 15 cm and 13,61%, while in polyculture stands resulted in abundance, thickness, and moisture content of fuel respectively 14.57 tons/ha, 10 cm and 16,46%. The moisture content in monoculture and polyculture stands is below the percentage value of 30% so that the two stands in the Cilegon PLTGU conservation area include areas that are still prone to forest fires.
Keyword: Bahan bakar, Kadar air, Kebakaran hutan, Struktur tegakan

Judul: Analisis Vegetasi dan Cadangan Karbon di Areal PT PLN Indonesia Power UJP PLTGU Cilegon
Abstrak: PLTGU (Pembangkit Listrik Tenaga Uap dan Gas) Cilegon memilliki kawasan perlindungan keanekaragaman hayati dan sumber daya biologi yang berfungsi sebagai penyerap emisi. Tujuan penelitian ini adalah mengidentifikasi keanekaragaman vegetasi dan menghitung cadangan karbon di kawasan PLTGU Cilegon. Perhitungan cadangan karbon tegakan dilakukan secara sensus menggunakan metode non-destruktif dengan rumus alometrik, sedangkan tumbuhan bawah dan serasah dengan teknik penarikan sampel menggunakan metode purposive sampling secara destruktif. Hasil penelitian menunjukkan terdapat 49 spesies dari 22 famili dengan tingkat pertumbuhan pancang terdapat 36 spesies, tiang 38 spesies, dan pohon 27 spesies. Keanekaragaman dan kemerataan vegetasi di PLTGU Cilegon tergolong sedang dengan jenis mangga (Mangifera indica) memiliki INP tertinggi tingkat pancang dan tiang, sedangkan tingkat pohon adalah pohon pelangi (Eucalyptus deglupta). Cadangan Karbon di PLTGU Cilegon tergolong rendah yaitu 17,52 Co2 (ton/ha) dan potensi serapan karbon 64,31 CO2 (ton/ha). Nilai ekonomi dari cadangan karbon di PLTGU Cilegon berdasarkan estimasi harga pasar karbon tahun 2023 adalah Rp 33.178.679 hingga Rp 298.608.111., PLTGU (Steam and Gas Power Plant) Cilegon has protected area for biodiversity and biological resources that serves as an emission absorber. The purpose of this study was to identify vegetation diversity and calculate carbon reserve in the PLTGU Cilegon area. The calculation of standing carbon stocks was carried out by census using the non-destructive method with the allometric formula, while undergrowth plants and litter were with purposive sampling techniques using the destructive method. The results showed that there were 49 species from 22 families with level of sapling 36 species, pole 38 species, and tree 27 species. The diversity and evenness of vegetation in PLTGU Cilegon is classified as medium with the type of mango (Mangifera indica) having the highest IVI (Important Value Index) at the sapling and pole levels, while the tree level is rainbow tree (Eucalyptus deglupta). The carbon stock in PLTGU Cilegon is low at 17.52 Co2 (tons/ha) and the carbon sequestration potential is 64.31 CO2 (tons/ha). The economic value of the carbon stock in PLTGU Cilegon based on the estimated carbon market price in 2023 is Rp 33,178,679 to Rp 298,608,111.
Keyword: alometrik, biomassa, emisi, karbon tersimpan, keanekaragaman vegetasi

Judul: Studi sistematika  Oreophryne Boettger, 1895Sulawesi (Anura: Microhylidae)
Abstrak: The cross frogs, genus Oreophryne Boettger, 1895 are most diverse in the mainland of New Guinea and adjacent islands, to the Wallacea region in the Moluccas, Sulawesi, and the Lesser Sunda Islands, even marginally to the Oriental region in Bali and to the southern Philippine Islands. In Sulawesi, this taxon consists of three species but has rarely been reported since their original descriptions and remained unstudied in both taxonomical work and molecular study. This research aims to evaluate the taxonomic status of the cross frogs in Sulawesi based on morphology and estimate the phylogenetic using the 16S rRNA gene. The phylogenetic tree was reconstructed under Maximum Likelihood (ML) and Bayesian Inference (BI) analyses. We used the specimens of Sulawesian Oreophryne which were stored at the Museum Zoologicum Bogoriense (MZB). A total of about 19 morphological characters were measured by a digital caliper and ocular micrometer to the nearest 0.01 mm. The phylogenetic tree shows that the three nominal species of Oreophryne from Sulawesi are clearly clustered. Correspondingly, the phylogenetic analysis supports the recognition of a new taxon, Oreophryne sp. However, the phylogenetic relationships between Oreophryne within Wallacea remain unresolved. Consequently, further systematic analysis along with additional sequences from the type locality is necessary to clarify the interspecific relationship among this region. We examined the morphology of 50 voucher specimens of Sulawesian Oreophryne. The validity of O. celebensis, O. variabilis, and O. zimmeri was confirmed in this study, but still the latter remains to be established. The three nominal species examined here were not collected from the type locality, so additional specimens, either in the type locality, new locations, or in other areas on this island are needed to evaluate the taxonomic status of these species deeply. Moreover, the unnamed species from the highland of the Mekongga mountains differ morphologically and genetically from all previously described Sulawesian Oreophryne. This distinct species will increase the number of cross frogs in Sulawesi to four species, all of which are endemic.
Keyword: frog, morphology, Oreophryne, phylogenetic, Sulawesi, systematics