Judul: Diversity of Soil Mesofauna Species in Various  Types of Land Cover in Panglungan Village, Jombang District
Abstrak: Jenis tutupan lahan berpengaruh terhadap kondisi tanahyang selanjutnya berakibat pula pada perbedaan keanekaragaman mesofauna tanah. Penelitian ini bertujuan untuk mengetahui pengaruh tutupan lahan terhadap keanekaragaman mesofauna tanah di bawahnya. Metodologi yang digunakan meliputi analisis kualitas tanah, kelimpahan dan keanekaragaman mesofauna tanah, serta menguji tingkat kesamaan komunitas mesofauna tanah antar tutupan lahan. Pengambilan sampel tanah dilakukan di beberapa titik pada masing-masing tutupan lahan, yaitu ladang jagung, perkebunan kopi, dan hutan sekunder. Hasil penelitian menunjukkan bahwa secara keseluruhan ditemukan 20 famili dari 13 ordo yang berbeda. Kelimpahan populasi mesofauna tanah tertinggi terdapat pada tutupan lahan ladang jagung, sedangkan kelimpahan terendah terdapat pada tutupan lahan perkebunan kopi. Nilai keanekaragaman mesofauna tanah tertinggi terdapat pada tutupan lahan hutan sekunder, sedangkan nilai keanekaragaman mesofauna tanah terendah terdapat pada tutupan lahan perkebunan kopi. Perbedaan jenis dan keanekaragaman vegetasi dapat meningkatkan keanekaragaman mesofauna tanah, sedangkan campur tangan terhadap tanah, seperti pemupukan dapat menurunkan keanekaragaman mesofauna tanah., Types of land cover affect soil condition which results in differences in the diversity of soil mesofauna. This study aims to determine the effect of land cover on the diversity of mesofauna in the underlying soil. Method of this study included analysis of soil quality, abundance, and diversity of soil mesofauna, as well as testing the level of similarity of soil mesofauna communities between land covers. Soil sampling was carried out at several points in each land cover, namely rice fields, coffee plantations, and secondary forests. The results of this analysis showed that there were 20 families of mesofauna from 13 different orders. The highest abundance of soil mesofauna population was found in rice field land cover, while the lowest abundance was in coffee plantation land cover. The highest value of soil mesofauna diversity was found in secondary forest land cover. On the other hand, the coffee plantation land cover was found as having the lowest soil mesofauna diversity. The differences between types and diversity of vegetation can increase the diversity of soil mesofauna, while intervention on soil, such as fertilization can reduce soil mesofauna diversity.
Keyword: kelimpahan, keanekaragaman, mesofauna tanah, tutupan lahan, abundance, diversity, land cover, soil mesofauna

Judul: Abundance of Soil Macrofauna on Several Land Covers in Balangan Regency, South Kalimantan Province
Abstrak: Keberadaan makrofauna tanah memiliki peran penting dalam mempertahankan dan mengembalikan kesuburan tanah. Penelitian ini bertujuan menganalisis kelimpahan makrofauna tanah dan pengaruh jenis vegetasi, serta lingkungan terhadap kelimpahan makrofauna tanah pada beberapa tutupan lahan di Kabupaten Balangan, Kalimantan Selatan. Pembuatan petak dengan ukuran 20 m × 20 m secara purposive sampling. Analisis data dilakukan dengan uji Beda Nyata Terkecil (BNT) dan uji korelasi Pearson. Kelimpahan makrofauna tanah secara keseluruhan terdiri atas 15 ordo dan 27 famili dengan total individu sebanyak 370 individu/m². Hasil uji BNT menunjukkan kelimpahan makrofauna tanah berbeda nyata di hutan sekunder dan lahan kosong, sedangkan kelimpahan makrofauna tanah tidak berbeda nyata antara hutan meranti dan kebun karet. Berdasarkan uji korelasi Pearson, faktor klimatis kelembapan tanah memiliki hubungan positif yang sangat kuat terhadap kelimpahan makrofauna tanah, serta faktor edafis seperti porositas, C-organik, respirasi, berat basah, berat kering, dan kadar air juga memiliki hubungan positif yang sangat kuat terhadap kelimpahan makrofauna tanah., The existence of soil macrofauna has an important role in maintaining and restoring soil fertility. This study aimed to analyze the abundance of soil macrofauna and the influence of vegetation type, as well as the environment on the abundance of soil macrofauna in several land covers in Balangan Regency, South Kalimantan. Plots measuring 20 m × 20 m were made using purposive sampling. Data analysis used the Least Significant Difference (LSD) test and Pearson correlation test. The overall abundance of soil macrofauna consists of 15 orders and 27 families with a total of 370 individuals/m². The BNT test results showed that the abundance of soil macrofauna was significantly different in secondary forests and empty land, while the abundance of soil macrofauna was not significantly different between meranti forests and rubber plantations. Based on the Pearson correlation test, the climatic factor of soil moisture has a very strong positive relationship with the abundance of soil macrofauna, and edaphic factors such as porosity, C-organic, respiration, wet weight, dry weight, and moisture content also have a very strong positive relationship with the abundance of soil macrofauna.
Keyword: climatic, edaphic, formicidae, secondary forest, vegetation

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