Judul: Model Penduga Kerapatan Tegakan dengan Forest Canopy Density dan Biomassa di Resort Teluk Pulai Taman Nasional Tanjung Puting
Abstrak: Taman Nasional Tanjung Puting (TNTP) merupakan kawasan konservasi yang memiliki ekosistem hutan gambut. Hutan memiliki fungsi menyerap CO2 melalui proses fotosintesis, hasil fotosintesis tersebut disimpan sebagai biomasa. Potensi TNTP dalam menyimpan biomassa (Bo) belum teridentifikasi jumlahnya. Forest Canopy Density (FCD) merupakan salah satu metode penginderaan jauh untuk mendeteksi kerapatan vegetasi. Penelitian ini bertujuan untuk membangun penduga kerapatan tegakan dengan FCD, menghitung nilai rata-rata biomassa, dan melihat hubungan biomassa dengan basal area tegakan (BA). Penelitian dimulai dengan pengolahan FCD dan pengumpulan data lapangan yang selanjutnya diolah untuk menghitung kerapatan tegakan. Biomassa dihitung menggunakan allometrik Y = 0,064*DBH2,657. Model penduga disusun menggunakan persamaan linier sederhana. Hubungan nilai kerapatan tegakan dengan FCD menghasilkan model y = 328*FCD – 10694 dengan nilai R2 sebesar 0,82 . Rata-rata potensi biomassa tegakan adalah 376,15 ton/ha. Nilai biomassa setiap petak ukur sangat dipengaruhi oleh basal area tegakan. Regresi antara nilai BA dengan biomassa adalah Bo = 8,6688*BA – 78,016 dengan R2 = 0,86., Tanjung Puting National Park (TNTP) is a conservation area which has a peat swamp forest ecosystem. Forests have the function of absorbing CO2 through the process of photosynthesis, the results of photosynthesis are then stored as biomass. The potential of TNTP to store biomass (Bo) has not been identifie. Forest Canopy Density (FCD) is one of the remote sensing methods to detect vegetation density. This study aims to build a stand density estimator with FCD, calculate the average biomass value, and see the relationship between biomass and basal areal. The research began with FCD processing and field data collection which was then processed to calculate stand density. Biomass was calculated using the allometric Y = 0.064*DBH2.657. The estimation model was developed using a simple linear equation. The relationship between stand density values and FCD resulted in a model y = 328*FCD - 10694 with an R2 value of 0.82. The average potential standing biomass was 376.15 tons/ha. The biomass value of each petak ukur was strongly influenced by the stand's basal area. The regression between BA value and biomass was Bo = 8.6688*BA - 78.016 with R2 = 0.86.
Keyword: biomassa, forest canopy density, kerapatan tegakan, basal area, biomass, forest canopy density, stand density, basal area.

Judul: Pendugaan Kerapatan Vegetasi Menggunakan NDVI dan Cadangan Karbon di Zona Pemanfaatan Taman Nasional Gunung Halimun Salak
Abstrak: Forestry and Other Land Uses (FOLU) merupakan sektor penting dalam strategi pembangunan rendah karbon dan ketahanan iklim. Kawasan konservasi Taman Nasional Gunung Halimun Salak (TNGHS) berpotensi dalam mitigasi perubahan iklim melalui peningkatan cadangan karbon. Penelitian ini bertujuan untuk menduga kerapatan vegetasi menggunakan Normalized Difference Vegetation Index (NDVI), menduga biomassa dan cadangan karbon, serta menganalisis hubungan NDVI dengan keanekaragaman vegetasi dan cadangan karbon di zona pemanfaatan TNGHS. Metode yang digunakan yaitu analisis vegetasi dan pendugaan karbon menggunakan pendekatan alometrik dan destruktif untuk tingkat semai dan tumbuhan bawah. Plot yang dibangun berukuran 50 m × 50 m sebanyak 15 plot. Berdasarkan hasil analisis NDVI, kelas kerapatan terbagi menjadi kelas 1 (0,147 – 0,276), kelas 2 (0,276 – 0,321), dan kelas 3 (0,321 – 0,493). Komposisi vegetasi di zona pemanfaatan TNGHS terdiri atas 56 jenis tumbuhan dari 40 famili. Famili terbanyak adalah Arecaceae, Urticaceae, dan Euphorbiaceae. Lokasi penelitian didominasi oleh Pinus merkusii. Rata-rata biomassa dan konsentrasi karbon yang diperoleh masing-masing sebesar 131,14 ton/ha dan 61,64 ton C/ha. Konsentrasi karbon memiliki korelasi tertinggi dengan LBDS (r = 95,2%). Nilai NDVI berkorelasi paling tinggi dengan kerapatan pohon per hektar.
Keyword: aboveground carbon, conservation area, FOLU Net Sink, vegetation index

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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