Judul: Model Pemantauan Pelaksanaan Pembayaran Jasa Lingkungan di DAS Cidanau dengan Pendekatan Kerapatan Tegakan
Abstrak: Pembayaran Jasa Lingkungan (PJL) merupakan pemberian imbal jasa berupa pembayaran finansial dan non finansial kepada pengelola lahan atas jasa lingkungan yang dihasilkan. Persyaratan dalam pembayaran jasa lingkungan di DAS Cidanau yaitu jumlah tegakan yang ada dan tumbuh dengan baik tidak kurang dari 500 (lima ratus) batang per hektar. Saat ini, pemantauan jumlah tegakan di lahan PJL dilakukan dengan cara menghitung langsung jumlah tegakan per hektar per lahan. Pemantauan dengan metode tersebut memerlukan waktu yang cukup lama dan biaya yang tidak sedikit. Pemantauan jumlah tegakan pada lahan PJL di DAS Cidanau perlu dilakukan menggunakan metode baru yang lebih efisien. Penelitian dilakukan di DAS Cidanau, Kabupaten Serang dan Kabupaten Pandeglang, Provinsi Banten. Model pendugaan kerapatan tegakan dengan leaf area index merupakan model pendugaan terbaik yang dapat digunakan untuk menduga kerapatan tegakan pada lahan pembayaran jasa lingkungan di DAS Cidanau. Persentase kerapatan kanopi di dua kelompok tani hutan semakin meningkat setelah periode pembayaran jasa lingkungan.
Keyword: basal area, forest canopy density, kerapatan tegakan, leaf area index

Judul: Peran pembayaran jasa lingkungan (PJL) hutan terhadap sifat hidrologi lahan di DAS Cidanau, Banten
Abstrak: Payment for Environmental Services (PES) in Cidanau watershed is the payment for environmental services of Forest Ecosystem to control the water yield in Cidanau watershed. This PES is driven by issue of water yield decreasing, suggested due to forest encroachment of Rawa Danau. The role of PES for water yield control is approached through its role for the soil hydraulic properties. The research aim to analyze the difference of soil hydraulic properties managed with and without PES incentives. The research includes analysis of land use changes, infiltration rate and soil hydraulic properties of land with and without PES, and simulation of water flow as the response of rainfall. Implementation of PES in Cidanau watershed is able to maintain the good condition of forest. Soil hydraulic properties of land with PES is relatively better. The infiltration rate of land with PES is higher than without PES. Gravitational and available water is higher in land of without PES whereas the soil hydraulic condactivity is higher in land of with PES. Kostiakov and Horton models both are able to predict the rate of infiltration. Kostiakov is better than Horton model relatively. Log Normal Kosugi model was able to predict a soil-water retension curve and unsaturated hydraulic conductivity. One dimensional vertical flow simulation shown the higher flow in land with PES than without PES.
Keyword: Bogor Agricultural University (IPB), soil hydraulic properties, infiltration, Payment for environmental services of forest

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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