Judul: Keragaman dan Sebaran Tumbuhan Asing Invasif di Bumi Perkemahan dan Graha Wisata Pramuka (BUPERTA) Cibubur
Abstrak: Tumbuhan asing invasif merupakan tumbuhan yang bukan berasal dari suatu wilayah, namun spesies tumbuhan tersebut mampu bertahan hidup pada wilayah baru serta dapat mengancam spesies tumbuhan asli. Penelitian ini bertujuan mengetahui keanekaragaman spesies tumbuhan asing invasif dan sebarannya di Bumi Perkemahan dan Graha Wisata Pramuka (BUPERTA) Cibubur. Pengambilan data dilakukan dengan metode kuadrat dengan penempatan plot sengaja (purposive sampling). Plot utama berukuran 10 m x 10 m dibuat pada lokasi perkemahan 1, lokasi perkemahan 2, dan arboretum. Setiap plot utama dibuat 3 subplot contoh berukuran 2 m x 2 m. Data vegetasi dianalisis untuk mendapat indeks nilai penting (INP), indeks keanekaragaman Shannon-Wiener (H’), indeks kesamaan (IS), indeks dominansi (D), dan indeks kemerataan (E). Hasil analisis vegetasi menunjukan spesies tumbuhan asing invasif yang ditemukan pada lokasi penelitian terdapat 9 spesies yang termasuk ke dalam 8 famili. Spesies tumbuhan asing invasif yang mendominasi pada dua dari tiga lokasi penelitian, yaitu Asystasia gangetica, Mimosa pudica, dan Stachytarpheta indica., Invasive alien species is a plant that does not originate from a region. However, these plant species can survive in new areas and threaten native species. This research was conducted to determine the diversity and distribution of invasive alien plant species in Bumi Perkemahan dan Graha Wisata Pramuka (BUPERTA) Cibubur. Data collection was taken using the quadrat method with purposive sampling. The main plot measuring 10 m x 10 m was made in campsite 1, campsite 2, and arboretum. For each main plot, 3 sample plots measuring 1 m x 1 m were made. Vegetation data were analyzed to determine the Important Value Index (IVI), Shannon-Wiener diversity index (H'), similarity index (IS), dominance index (D), and evenness index (E). The vegetation analysis showed that 9 species and 8 families of invasive alien plant species were found at the research locations. Invasive alien plant species dominated in two of the three study locations, Asystasia gangetica, Mimosa pudica, and Stachytarpheta indica.
Keyword: dominance index, IVI, purposive sampling, vegetation analysis

Judul: Diversity and distribution patterns of invasive alien plant species in bojonglarang jayanti nature reserve cianjur
Abstrak: Cagar Alam Bojonglarang Jayanti adalah salah satu kawasan konservasi yang diduga diinvasi oleh spesies tumbuhan asing. Tujuan dari penelitian ini adalah menghitung keanekaragaman dan mengidentifikasi pola sebaran spesies tumbuhan asing invasif. Pengumpulan data menggunakan analisis vegetasi metode kombinasi jalur dan garis berpetak pada vegetasi hutan, dan metode petak ganda pada vegetasi padang rumput. Hasil analisis vegetasi di hutan dataran rendah primer teridentifikasi 2 spesies tumbuhan asing invasif yang termasuk ke dalam 2 famili, di vegetasi hutan pantai teridentifikasi 11 spesies tumbuhan asing invasif yang termasuk ke dalam 8 famili, di vegetasi hutan dataran rendah sekunder teridentifikasi 13 spesies tumbuhan asing invasif yang termasuk ke dalam 9 famili, dan di vegetasi padang rumput teridentifikasi 10 spesies tumbuhan asing invasif yang termasuk ke dalam 8 famili. Secara umum pola sebaran tumbuhan asing invasif berdasarkan indeks Morisita adalah mengelompok (clumped)., Bojonglarang Jayanti Nature Reserve is one of the conservation area that is supposed getting inveded by alien plant species. The purpose of this research is to counting diversity and identify distribution patterns of invasive alien plant species. Data was collected by vegetation analysis with squared track and line combination method in forest vegetation, and quadrat method in savanna vegetation. The result of vegetation analysis in primary lowlands forest vegetation was identified 2 invasive alien plant species that belong to 2 families, in coastal forest was identified 11 invasive alien plant species that belong to 8 families, in secondary lowlands forest was identified 13 invasive alien plant species that belong to 9 families, and in savanna vegetation was identified 10 invasive alien plant species that belong to 8 families. Generally, the distribution patterns of invasive alien plant species based on Morisita index was clumped.
Keyword: Bojonglarang Jayanti, keanekaragaman, pola sebaran, spesies tumbuhan asing invasif

Judul: Peran Surfaktan Setiltrimetilamonium Bromida dan Natrium Dodesil Sulfat pada Sintesis ZnO dengan Metode Hidrotermal
Abstrak: Zno crystal is the main preference material in various applications recently, such as in semiconductors, ultraviolet lasers, and catalysts. This study aims to synthesize ZnO with addition of surfactant. ZnO crystals were synthesized by reacting ZnSO4, KOH, and surfactants using hydrothermal method. The first step was to determine the best ratio of ZnSO4: KOH (1:2; 1:3; 1:4, and 1:5) based on X-ray diffraction. The second step was to evaluate the role of surfactan cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) on the synthesis of ZnO crystals. The result of this study showed the best ratio of ZnSO4:KOH was 1:3, based on the least of impurities and the highest degree of crystallinity (85.64%). The addition of surfactant CTAB and SDS in the synthesis of ZnO increased the degree of crystallinity, which were 98.28% and 92.17%, respectively. Based on mathematical calculation using Scherrer equation, the crystal size without surfactant was 32 nm, whereas with CTAB and SDS the crystallited size were 28 nm and 29 nm, respectively. The degree of crystallinity and crystal size indicated that CTAB surfactant produce ZnO crystals with the best characteristics as compared to SDS surfactant or without surfactant.
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