Judul: Penyusunan Metode untuk Menduga Nilai Radiasi Absorbsi dengan Menggunakan Citra Landsat TM/ETM+ (Studi Kasus Hutan Gunung Walat Sukabumi)
Abstrak: The purpose of this study is to predict the short-wave radiation values which is absorbed by using Landsat ETM + satellite imagery and software Gap Light Analyzer (GLA). Equilibrium radiation at the forest vegetation is ρ + τ + α = 1, where α is the proportion of solar radiation flux density absorbed by unit leaf area index, ρ is the proportion of flux density solar radiation reflected by a unit of leaf area index or canopy, and τ is proportion of solar radiation flux density transmitted by the unit leaf area index (Impron, 1999). The amount of transmission and reflection depending on the angle of solar radiation (Monteith, 1972). Radiation values components in Walat Mount Forest is short wave radiation value of 48 Wm-2, the transmission value is obtained by using the formula ρ + τ + α = 100% value of 89 Wm-2, and transmission value using the GLA is 100 Wm-2. Radiation absorption value in Walat Mountain is obtained using two methods, the first method is obtained using Kirchoff law approach of radiation absorption which value of 388 Wm-2 and the second is using the GLA which value of 377 Wm-2.
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Judul: Pendugaan nilai komponen neraca energi di kanopi hutan tanaman agathis loranthifolia dengan menggunakan satelit optik (Studi kasus Hutan Gunung Walat Sukabumi)
Abstrak: The process of absorption, reflection and transmission of radiation at the plant area will cause changes in the spectrum of solar radiation at the top, middle and bottom canopy (June, 1993). Next Odum (1970) suggests that many plants that grow in the shade of other plants which will be the quality of different spectral direct solar radiation, which causes a reduction in the amount of radiation received by the leaf surface compared with those leaves receiving direct solar radiation. This situation has important implications for the plants that grow beneath a thick canopy such as: the plants in the forest floor. This study tries to apply satellite remote sensing techniques and combined with the capture of field data have been processed before by using GLA software (Gap Light Analyzer) to estimate the value of the transmitted radiation by the canopy of plants. Value of net radiation received by the canopy of the forest areas of 51 Wm-2, the value of short-wave radiation reflected by the canopy of the forest areas of 48 Wm-2. The value range of the transmitted radiation calculations using GLA software is for 19% of short-wave radiation coming. This value is the direct radiation into the forest canopy with no obstructed by canopy cover. Determining the value of the transmitted radiation is strongly influenced by the quality of the image so that the required use of digital cameras that have lenses with a high acuity.
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Judul: Pengaruh Hormon Oksitosin dan Keberadaan Induk Jantan terhadap Keseragaman Waktu Melahirkan pada Ikan Plati Koral Xiphophorus maculatus
Abstrak: Ikan plati koral merupakan ikan yang bereproduksi dengan cara melahirkan (livebearer). Permasalahan yang dihadapi dalam budidaya ikan plati koral ialah ketidakseragaman waktu induk melahirkan anak dalam suatu pemijahan masal. Penelitian ini bertujuan menganalisis pengaruh hormon oksitosin dan keberadaan induk jantan terhadap keseragaman waktu melahirkan pada ikan plati koral. Dosis hormon oksitosin yang digunakan adalah 0, dan 0.2 ml L-1, dan jumlah induk jantan yang digunakan adalah 0, 1, 2, dan 3 ekor. Hasil penelitian ini menunjukkan bahwa perlakuan dosis hormon oksitosin meningkatkan jumlah induk yang melahirkan. Dosis hormon oksitosin yang dikombinasikan keberadaan induk jantan tidak memberikan pengaruh yang nyata terhadap keseragaman waktu melahirkan ikan plati koral. Jumlah induk ikan plati koral yang melahirkan hanya dipengaruhi oleh dosis hormon oksitosin dengan persentase induk melahirkan tertinggi sebesar 53.33% pada dosis 0.2 ml L-1 oksitosin. Perlakuan hormon dan keberadaaan induk jantan juga tidak memiliki interaksi dalam memengaruhi persentase keseragaman waktu melahirkan pada ikan plati koral.
Keyword: feromon, induk jantan, keseragaman, oksitosin, Xiphophorus maculatus