Judul: Diversity of Soil Arthropods in the Core Zone of Mount Halimun Salak National Park
Abstrak: Arthropoda tanah merupakan salah satu kelompok fauna yang hidup di tanah dan berperan dalam memengaruhi laju pembentukan tanah, dan siklus hara dalam ekosistem. Penelitian ini bertujuan untuk mengidentifikasi keanekaragaman Arthropoda tanah yang didapatkan pada Zona Inti Taman Nasional Gunung Halimun Salak (TNGHS), dan menganalisis pengaruh antara dua kelas kerapatan vegetasi, faktor edafis maupun faktor klimatis terhadap keanekaragaman Arthropoda tanah yang ditemukan pada kerapatan vegetasi di Zona Inti TNGHS. Metode yang digunakan dalam pengambilan sampel Arthropoda tanah menggunakan metode pitfall trap dan hand sorting. Data keanekaragaman Arthropoda tanah dengan faktor lingkungan dianalisis menggunakan uji Korelasi Pearson dan uji Paired Sample t-Test. Hasil penelitian ditemukan 16 ordo dan 39 famili yang berbeda dan didominasi oleh famili Formicidae (Hymenoptera) pada kedua kelas kerapatan vegetasi. Indeks keanekaragaman Arthropoda tanah (H’) pada kedua kelas kerapatan berjumlah 1,24 dan 1,44. Hasil uji t-Test menunjukkan tidak adanya perbedaan yang signifikan antara kedua kelas kerapatan vegetasi. Faktor edafis dan faktor klimatis memiliki hubungan korelasi baik ke arah positif maupun negatif dengan keanekaragaman Arthropoda tanah.
Keyword: Arthropoda tanah, edafis, klimatis, Taman Nasional Gunung Halimun Salak

Judul: Soil Fauna Diversity in the Agroforestry Areas of Mount Halimun Salak National Park
Abstrak: Taman Nasional Gunung Halimun Salak (TNGHS) merupakan area konservasi yang melibatkan masyarakat dalam pengelolaan lahan dengan sistem agroforestri. Keberadaan fauna tanah di lahan agroforestri diperlukan sebagai indikator kesuburan tanah. Penelitian bertujuan mengidentifikasi keanekaragaman fauna tanah, menganalisis pengaruh kerapatan vegetasi serta hubungan faktor lingkungan terhadap keanekaragaman fauna tanah di lahan agroforestri TNGHS. Metode pengambilan sampel fauna tanah dengan pitfall trap. Analisis data dengan mengukur kelimpahan, indeks keanekaragaman (H’), kekayaan (DMg) dan kemerataan (E) spesies, uji t paired dan korelasi pearson. Hasil penelitian ditemukan 15 ordo dan 32 famili dengan famili Formicidae (Hymenoptera) paling banyak ditemukan. Indeks H’ dan DMg pada kerapatan tinggi lebih besar (0,72 dan 3,28) dibandingkan dengan kerapatan sedang (0,63 dan 2,95). Indeks E pada kedua kerapatan tergolong rendah dan menunjukkan adanya dominansi dari famili Formicidae. Hasil uji t paired menunjukkan tidak ada perbedaan yang signifikan antara kerapatan tinggi dan sedang. Keanekaragaman fauna tanah berkorelasi sangat rendah dengan pH tanah, respirasi, dan intensitas cahaya. Sementara dengan ketebalan serasah korelasinya rendah, dan dengan suhu tanah korelasinya sedang., Gunung Halimun Salak National Park (TNGHS) is a conservation area that involves communities in land management with agroforestry systems. The presence of soil fauna in agroforestry land is needed as an indicator of soil fertility. The study aims to identify the diversity of soil fauna, analyze the effect of vegetation density and the relationship of environmental factors on soil fauna diversity in agroforestry land TNGHS. The method of sampling soil fauna with pitfall traps. Data analysis by measuring the abundance, diversity index (H'), richness (DMg) and evenness (E) of species, paired t test and Pearson correlation. The results of study found 15 orders and 32 families with Formicidae family (Hymenoptera) found the most. The H' and DMg indices at high density were greater (0.72 and 3.28) than those at medium density (0.63 and 2.95). The E index in both densities was low and indicated the dominance of Formicidae family. The paired t test results showed no significant difference between high and medium densities. Soil fauna diversity was very lowly correlated with soil pH, respiration, and light intensity. While with litter thickness the correlation is low, and with soil temperature the correlation is moderate.
Keyword: Agroforestri, Fauna tanah, Keanekaragaman, Taman Nasional Gunung Halimun Salak

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4