Judul: Kompleksitas Habitat Berdasarkan Jenis Gangguan Di Bukit Bintang Dan Bukit Angsana Bogor
Abstrak: The role of disturbance in shaping biodiversity is widely recognized as a key components of all ecosystem. In this context, human can contribute to the physical disturbances changes, through construction activities in certain landscape or forest followed by desired purposes such as the interest of tourism. Therefore, the value of each landscape necessary to defined, well prior to being used as a nature-based tourism site and it makes them easier to monitor that may influences the quality of a habitat. Considering this alteration, this research aims to analyze the habitat complexity in several landscapes as the consequences of the different type of disturbances in Leuwiliang, Bogor, West Java Province. The research methods consisted of study area identification, microclimate measurements, assessment of habitat complexity parameters, sampling of soil arthropods, identification of soil arthropods, and data analysis. The result showed that habitat complexity index in Secondary Forest, Bukit Angsana, and Bukit Bintang, respectively; 9, 4, and 3. The Shannon-Wiener diversity index in Secondary Forest and Bukit Angsana; 0.78 (low diversity) and Bukit Bintang; 1.25 (moderate diversity). The obtained abundance of soil arthropods in the Secondary Forest, Bukit Angsana, and Bukit Bintang, respectively; 138, 178, and 162. Landscape changes caused by different types of disturbances such as plantations and tourism areas revealed a decrease in their habitat complexity. This alteration in disturbed areas was mostly caused by highfrequency of disruption within forest conversion. For instance, land clearing activities are routinely carried out by tourism management to maintain the cleanliness of the tourism environment. This factor contributes to the slight composition of ground herbage and leaf litter presence in the soil, especially of the litter dwelling arthropods when litter or herb layers are removed frequently. Moreover, anthropogenic disturbances by plantation management and plot maintenance could also affect towards the local species richness and abundance patterns. Lastly, the soil arthropods abundance and diversity on the specific or certain land has their own function and usability to support the assessment of habitat complexity which represented.
Keyword: Ecosystem Function Analysis (EFA), landscape alteration, nature-based tourism, soil arthropods

Judul: Habitat Complexity Based-on Type of Disturbances in Bukit Bintang and Bukit Angsana Bogor
Abstrak: Peran gangguan dalam membentuk keanekaragaman hayati telah diakui secara luas sebagai salah satu komponen kunci dalam semua ekosistem. Dalam konteks ini, manusia dapat berkontribusi terhadap perubahan gangguan fisik melalui kegiatan konstruksi pada lanskap atau hutan tertentu yang diikuti dengan tujuan yang diinginkan seperti kepentingan pariwisata. Oleh karena itu, nilai masing-masing lanskap perlu didefinisikan sebelum dikonversikan menjadi kawasan wisata alam, juga memudahkan pemantauan yang dapat mempengaruhi kualitas suatu habitat. Mempertimbangkan adanya perubahan ini, penelitian ini bertujuan untuk menganalisis kompleksitas habitat beberapa tipe lahan sebagai akibat dari perbedaan tipe gangguan di Leuwiliang, Bogor, Provinsi Jawa Barat. Metode penelitian terdiri dari mengidentifikasi wilayah pengamatan, pengukuran iklim mikro, pengukuran parameter kompleksitas habitat, pengambilan sampel arthropoda tanah, identifikasi arthropoda tanah, dan analisis data. Indeks kompleksitas habitat di Hutan Sekunder, Bukit Angsana, dan Bukit Bintang, berturut-turut adalah 9, 4, dan 3. Indeks keanekaragaman Shannon-Wiener di Hutan Sekunder dan Bukit Angsana; 0.78 (keanekaragaman rendah) dan Bukit Bintang; 1.25 (keanekaragaman sedang). Kelimpahan arthropoda tanah yang diperoleh masing-masing di Hutan Sekunder, Bukit Angsana, dan Bukit Bintang adalah; 138, 178, dan 162. Perubahan lahan disebabkan oleh perbedaan tipe gangguan seperti difungsikan sebagai area perkebunan atau pariwisata telah menunjukkan penurunan dalam kompleksitas habitatnya. Faktor yang paling signifikan dari penurunan kompleksitas habitat adalah tingginya frekuensi distrupsi pada konversi hutan. Misalnya, aktivitas pembersihan lahan yang rutin dilakukan oleh manajemen pariwisata untuk menjaga kebersihan lingkungan kawasan wisata alam. Faktor ini berkontribusi terhadap komposisi tumbuhan herba dan keberadaan serasah daun di tanah yang akan mempengaruhi keberadaan arthropoda tanah. Gangguan arthropogenik oleh manajemen perkebunan dan pemeliharaan plot tanaman juga dapat mempengaruhi pola kekayaan dan kelimpahan spesies. Terakhir, kelimpahan dan keanekaragaman arthropoda tanah pada suatu lahan spesifik atau tertentu memiliki fungsi dan kegunaan masing-masing untuk mendukung penilaian kompleksitas habitat yang direpresentasikan.
Keyword: arthropoda tanah, Ecosystems Function Analysis (EFA), perubahan lanskap, wisata alam

Judul: Membran polistirena dengan ragam suhu perendaman untuk pervaporasi alkohol
Abstrak: Polystyrene membrane with PLURONIC as porogen, can be utilized in alcohol pervaporation. The polystyrene membrane was made by reverse phase method which was started with making of polymeric mixed solution between polystyrene and PLURONIC in dichloromethane with 2 different compositions, i.e.-polystyrene :PLURONIC:dichloromethane 17:0:83 and 17:1:82. The solution was stirred up for 5 hours with ultrasonic and casted on the glass plate surface, and then it was immersed into water at 40, 50, and 60 oC. The highest pervaporation result was 90,2% alcohol purities at 50 oC immersion temperature. However, this result was not good enough because the alcohol purities was lower than the standard alcohol purities at 91,6%.
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