Judul: Perubahan Karakteristik Kimia Tanah pada Model Reklamasi Lahan Bekas Tambang PT. Antam UBPE Pongkor
Abstrak: High mining activity in the forested land had damaged the forest, that reclamation is necessary to restore the forest conditions as before. This research aims at finding out changes on soil chemistry, and the concentration of Pb and Fe in the soil, and the 10 years old planted rosewood, pine, and walnut trees at the reclamation ex-gold mining land as a model of PT. Antam UBPE Pongkor. Soil analysis at 0–5 cm, 5–15 cm and 15–30 cm depth showed increase soil quality, especially in C-organic content at 0–5 cm, which is much higher than the deeper depth. C-organic content of rosewood stand was 2.08%, pine was 1.04% and walnut was 0.95%. The 10 years old planted trees had absorbed Pb and Fe, of which the highest Pb content was found in walnut roots at 13 ppm, while the highest Fe content was in pine roots at 4933 ppm
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Judul: Analisis Sifat Fisik, Kimia, dan Biologi Tanah pada Lahan Reklamasi Bekas Tambang Batubara PT Berau Coal Site Binungan, Kabupaten Berau, Provinsi Kalimantan Timur
Abstrak: Soil degradation becomes the greatest problem of environmental damage due to coal mining, in particular by open pit method. Proper reclamation must be done to repair post mining land so that soil quality can be recovered approaching the original properties. To analyze the results of the reclamation process on physical, chemical, and biological soil properties changes and their development, it is necessary to study the changes of soil properties at different ages post coal mining land reclamation. This research was aimed to identify the changes of physical, chemical, and biological soil properties in relation to increased reclamation age (0, 3, 6, and 9 years old) and compared them to the nearby forest soil properties. This research was conducted in reclaimed post coal mining lands of PT Berau Coal Site Binungan, East Kalimantan Province (aged 0, 3, 6, and 9 years), and native forest. Soil analysis performed at the Laboratory of Chemical and Soil Fertility, Laboratory of Soil Physics, and Laboratory of Soil Biotechnology, Department of Soil Science and Land Resources, Faculty of Agriculture, Bogor Agricultural University. The results showed that increasing age causes changes in soil properties of reclaimed land approaching the soil properties of original land. This can be seen on the parameters such as bulk density, infiltration capacity, aluminum saturation, C-organic, total N, base saturation, Cation Exchange Capacity (CEC), total microbial and fungal, and soil respiration. It is apparent that chemical and biological soil properties on reclaimed land change relatively faster approaching the chemical and biological soil properties of the original land compared to that of physical soil properties.
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Judul: Beberapa aspek anatomi alat sirkulasi ruang dada kancil
Abstrak: Telah dilakukan penelitian dengan menggunakan 10 ekor kancil dewasa jantan dan betina dengan tujuan untuk menge- tahui beberapa aspek anatomi alat sirkulasi di dalam ruang dada, meliputi jantung, pembuluh darah yang keluar dan ma- suk jantung serta ukuran-ukuran jantung. Kancil merupakan ruminansia terkecil di dunia, hidup di daerah tropika India, Thailand, Malaysia dan Indonesia bagian barat. Hewan ini dilindungi dan mempunyai prospek yang baik untuk hewan penelitian maupun dibudidayakan. Hasil penelitian menunjukkan bahwa berat jantung rаta-rata adalah 0.69% dari berat rata-rata kancil. Dan ini mirip pada jantung kuda dan anjing. Bentuk jantung lonjong seperti halnya ruminansia. Demikian pula letaknya di dalam ruang dada seperti pada ruminansia dengan adanya Ligamentum sternopericardiacum. Di dalam ventrikel kanan membersit sebuah Musculus (M.) papillaris dari dindingnya dan tiga sampai empat Musculi (Mm.) papillares dari Septum interventriculare. Hanya dua buah Mm. papillares yang berukuran besar dibersitkan dari dinding ventrikel kiri. Percabangan Arteri (A.) coronaria sinistra lebih dominan dari pada A. coronaria dextra. Sedangkan A. sub clavia sinistra dicabangkan langsung dari aorta di dorso- caudal pembersitan Truncus (Tr.) brachiocephalicus…
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