Judul: Evaluation of Infiltration and Permeability Values in Various Land Uses
Abstrak: Infitrasi dan permeabilitas tanah merupakan dua hal yang saling berkaitan. Permeabilitas tanah mempengaruhi infiltrasi tanah. Laju infiltrasi konstan pada dasarnya ditentukan oleh nilai permeabilitas. Meskipun demikian, terdapat beberapa kasus bahwa nilai infiltrasi jauh lebih tinggi daripada nilai permeabilitas. Hal itu mengindikasikan adanya ketidakselarasan pada kedua parameter tersebut sehingga perlu diteliti. Penelitian ini bertujuan untuk mengevaluasi ketidakselarasan nilai infiltrasi dan permeabilitas tanah serta mengindentifikasi faktor-faktor penyebab ketidakselarasan tersebut. Metode yang digunakan dalam penelitian ini adalah dengan menduplikasi penetapan permeabilitas dan infiltrasi dari penelitian sebelumnya dan melakukan pengukuran di lapang untuk mengidentifikasi faktor-faktor penyebab ketidakselarasan tersebut. Hasil penelitian menunjukkan konsistensi nilai infiltrasi konstan yang lebih tinggi dari permeabilitas seperti halnya pada penelitian sebelumnya. Hasil analisis menunjukkan bahwa ketidaselarasan terjadi akibat adanya sebaran air secara horizontal pada penetepan infiltrasi dan adanya penyumbatan pori tanah pada saat persiapan tanah untuk pengukuran permeabilitas., Infiltration and soil permeability are two things that are interrelated. Soil permeability affects soil infiltration. The constant infiltration rate is determined by the permeability. Even so, there are some cases where the infiltration value is much higher than the permeability value. This indicates that there is an inconsistency in the two parameters so that it needs to be investigated. This research aims to evaluate the inconsistency of infiltration value and permeability of the field and to identify the factors that cause the discrepancy. The method used in this research is to duplicate the determination of the permeability and infiltration from the previous research and conduct field observations to identify the factors causing the incompatibility. The results showed the consistency of the infiltration value which were higher than the permeability value with the previous research. This further strengthens that the misalignment is caused by the horizontal distribution of water in infiltration measuremen and the blockage of soil pores during soil preparation for permeability measurements.
Keyword: double ring infiltrometer, infiltrasi, metode pewarnaan, model infiltrasi, permeabilitas, double ring infiltrometer, infiltration, dye method, infiltration model, permeability

Judul: Keragaan Infiltrasi Tanah Latosol pada Beberapa Penggunaan Lahan di DAS Ciujung
Abstrak: Land use is an important aspect in maintaining ecosystem sustainability, particularly in the watershed ecosystem. Land use determines to physical, chemical, and biological characteristics of soil. These soil characteristics influence to the growth of plants and the performances of water infiltration into soil. Infiltration is an essential part of the hydrological cycle that has an important role water availability in the soil. Infiltration process have an important role to the distribution of rainfall and control to runoff, flood, erosion and ground water storage and finally will determines the availability of river discharge in dry season. The aims of this research is to assess the performance of soil infiltration in various land use in Ciujung watershed. The study was conducted on three land use types that included plantative forest (HT), dense mixed garden (KCR), and less-dense mixed garden (KCTR). The field observation was done by using the Double Ring infiltrometer method, while the the analysis of the physical and chemical and other soil characteristics were done in the Laboratory of Soil and Water Conservation, Department of Soil Science and Land Resources, Faculty of Agriculture. The results of this research showed that the infiltration rate is strongly influenced by land use. Infiltration rate is the highest and most stable on HT land use, followed by KCR and KCTR. Constant infiltration rate at HT and KCR is belonging to quickly class, while at KCTR is relatively moderate to fast. The magnitude of the rate constant infiltration in HT (23.4 cm h-1) is higher than KCR (13.2 cm h-1) and KCTR (6.0 cm h-1). The high rate infiltration of the soil on the land use of HT support it able to accommodate as much water (6.45 dm3) that higher than at KCR (3,66 dm3) and at KCTR (1.52 dm3). Infiltration rate is influenced by pores with large size (PDSC), while the volume of water infiltration is more influenced by the total porosity of the soil. Besides it is influenced by land use, soil infiltration in the study area is also determined by the physical and chemical characteristic of the soil organic matter, bulk density, total porosity, aggregate stability, macro pores, very fast drainage pore (PDSC), and soil texture.
Keyword: Bogor Agricultural University (IPB), infiltration volume., physical and chemical characterstics of soil, land use, Infiltration rate

Judul: Karakteristik Anatomi Skelet Kepala Buaya senyulong (Tomistoma schlegelii).
Abstrak: Buaya sepit atau senyulong (Tomistoma schlegelii) merupakan jenis buaya asli Indonesia yang berhabitat di sungai-sungai Sumatera, Kalimantan, dan juga pedalaman Sulawesi. Salah satu ciri khas buaya senyulong adalah bentuk moncong yang runcing dan sempit, namun hingga saat ini informasi mengenai struktur skelet kepala buaya senyulong sangat terbatas. Penelitian ini bertujuan untuk mempelajari karakteristik anatomi skelet kepala buaya senyulong yang dikatikan dengan fungsi dan perilakunya. Penelitian dilakukan secara eksploratif dengan melakukan pengamatan, pencatatan, dan pengambilan gambar dari skelet kepala buaya senyulong. Skelet kepala berukuran panjang 70 cm, lebar 29 cm, dan tingggi 17 cm dengan permukaan kasar pada os nasale, os frontale, os maxilla, os mandibula, os lacrimale, os jugale. Jumlah gigi pada buaya ini sebanyak 78 buah, terdiri dari 4 buah gigi premaxila, 16 buah gigi maxila, dan 19 buah gigi mandibula. Pada regio orbitalis ditemukan dua pasang fenestrae temporales yang berkembang baik. Fenestra supratemporale merupakan lubang oval yang membentang di sepanjang os parietale. Fenestra infratemporale berbentuk segitiga dan dibatasi oleh os squamosum, os postorbitale, os jugulare, dan os quadratum. Os mandibula hewan ini mempunyai symphysis mandibularis yang panjang yaitu garis yang melintang di corpus mandibulae. Secara fungsional ukuran symphysis mandibularis berkaitan dengan adaptasi hewan terhadap diet makan.
Keyword: kepala, moncong, Tomistoma schlegelii