Judul: Cation and Anion Relationship in Soil Solution Vertically on Typic Hapludult in Bukit Duabelas National Park
Abstrak: Soil nutrient content is dynamic, which is dependent on the amount and movement of cation-anion in the soil solution. This research was conducted to determine the amount of dissolved cations in soil solutions and to evaluate their relationship to typic hapludult soils in the tropical rainforest of Bukit Duabelas National Park (TNBD). Lisymeters are installed on each soil horizon to hold percolated water. The accumulated water sample was extracted and each cation (NH4+, Ca2+, Mg2+, K+) and anions amount and concentration (PO43-, Cl-, SO42-, NO3-) were measured. Data were analyzed using independent statistical tests, Spearman correlation, and stepwise linear regression. The results show that the total cations and anions are significantly higher in the AO horizon than the AB and B horizons. The results of the correlation analysis show that generally the cation has a strong correlation with each anion (correlation value> 0.80). The stepwise linear regression model shows that NH4+ has the strongest relationship with NO3-, PO43-, and Cl- with R2adj. = 0.75, Ca2+ to NO3-, PO43-, and SO42- (R2adj. = 0.856), Mg2+ to NO3- and PO43- (R2adj. = 0.815), and K+ to PO43- and Cl- (R2adj. = 0.845). It can be concluded that NO3-, Cl-, SO42-, and PO43- are directly involved as agents of co-pairing cations in soil nutrient movements and leaching processes. Closed nutrient cycle is the key to how forest land can maintain the fertility of the inner soil layer that receives nutrients through rainwater that enters the soil parent material through plant roots.
Keyword: cation, anion, soil horizon, forest fires, linear regression

Judul: Analysis of Soil Fertility at Various Level of Canopy Density in KHDTK Haurbentes, Bogor District, West Java
Abstrak: Kawasan Hutan Dengan Tujuan Khusus (KHDTK) Haurbentes merupakan kawasan hutan yang dimanfaatkan secara khusus menjadi hutan penelitian di kawasan hutan produksi. Kawasan hutan ini harus tetap memperhatikan kelestarian dan kesuburan tanahnya. Tujuan dilakukan penelitian ini adalah untuk menganalisis kesuburan tanah pada berbagai kerapatan tajuk berdasarkan sifat fisik dan kimia tanah. Kerapatan tajuk diukur menggunakan alat spherical densiometer (SD). Sampel tanah diambil di tiga titik secara diagonal pada petak berukuran 20 m × 20 m berdasarkan kerapatan tajuk rendah, sedang, dan tinggi. Parameter yang digunakan untuk menentukan kesuburan tanah yaitu tekstur tanah, pH tanah, C-organik, P2O5 potensial, K2O potensial, kation yang dapat ditukar, KTK, dan kejenuhan basa. Hasil penelitian menunjukkan bahwa kondisi tanah di bawah ketiga tutupan tajuk memiliki tekstur tanah beragam dari debu hingga lempung berpasir, pH tanah masam, C-organik, P2O5, dan kation dapat ditukar yang rendah, K2O yang sedang, dan kejenuhan basa yang rendah. Adapun nilai KTK sangat tinggi pada kerapatan tajuk rendah, sedang, dan tinggi berturut-turut adalah 50,30 me/100g, 52,96 me/100g, dan 53,93 me/100g. Status kesuburan tanah yang ditemukan pada setiap kerapatan tajuk masih tergolong rendah., Special Purpose Forest Area (KHDTK) Haurbentes is a forest area that is specifically used as a research forest in a production forest area. This forest area must still pay attention to the sustainability and fertility of the soil. The purpose of this study was to analyze soil fertility at various canopy densities based on the physical and chemical properties of the soil. The canopy density was measured using a spherical densiometer (SD). Soil samples were taken at three points diagonally on a 20 m × 20 m plot based on low, medium, and high canopy densities. The parameters used to determine soil fertility were soil texture, soil pH, organic C, potential P2O5, potential K2O, exchangeable cations, CEC, and base saturation. The results showed that the soil conditions under the three canopy covers had various soil textures from silt to sandy loam, acidic soil pH, low C-organic, P2O5, and cation exchangeability, moderate K2O, and low base saturation. As for the exceptionally high CEC values at low, medium, and high crown density were 50,30 me/100g, 52,96 me/100g, and 53,93 me/100g, respectively. Soil fertility status of the soil found at each canopy density was still relatively low.
Keyword: c-organik, hutan penelitian, kerapatan tajuk, kesuburan, KTK, c-organic, CEC, crown density, fertility, research forest

Judul: Infeksi Virus Parainfluenza Pada Anjing
Abstrak: Virus parainfluenza anjing termasuk famili Paramyxoviridae, berbentuk pleomorf dengan ukuran bervariasi (bergaris tengah antara 100-500 nm), berpembungkus peka ether, berisi genom RNA dan secara serologis mempunyai kesamaan dengan virus SV-5 kera; dikenak sebagai salah satu kausa penting dari sindrom "kennel cough". Infeksinya dapat mengenai anjing semua umur yang belum pernah terinfeksi atau mendapatkan vaksinasi mengakibatkan gejala klinis ringan yang terbatas pada traktus respirasi atu infeksi yang secara klinis tidak memperlihatkan gejala nyata. Gejala klinis yang nampak setelah masa inkubasi (1-5 hari) terlewati berupa batuk yang tidak berat selama beberapa hari, berbagai tingkat tonsilitis dan pharyngitis dan kadang-kadang ditemukan kenaikan temperatur rektal antara 1-2 derajat C dari temperatur normal rat-rata. Anjing terinfeksi mengandung virus pada traktus respirasi bagian atas dan bawah serta limfonoduli sampai hari ke 9 setelah infeksi. Penyebaran virus antar anjing terjadi secara aerogen.
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