Judul: Perubahan Sifat Fisik Dan Kimia Tanah Akibat Kegiatan Penebangan Hutan dengan Teknik Reduced Impact Logging dan Teknik Conventional Logging.
Abstrak: Forest is a natural environment that could not be evaded from continuous interactions with humans who lived around. The interactions is one way of human to use forest potention. Human activity to use forest is very often result in forest and enviromental degradation. One solution that could keep forest sustainability is a sustainable forestry management which put forward the conservation aspects. In this forest management, soil as a vital resources for plants growth needs to have sufficient attention because soil is one of the most important habitat besides climate and topography factors. A research to evaluate the soil physical and chemical changes due to deforestation activity with RIL and CNV technique was carried out on CIFOR research plots. Upon the research, soil samples were taken from RIL, CNV, and Control plot. The soil samples were analyzed in Soil Physical Laboratory and Soil Chemical Laboratory in Soil Science and Resources Department, IPB. The data which is examined from physical and chemical analysis then statistically analyzed with Test of Between Subjects Effects, and continued by Duncan Test with p < 0,05 to view the relationship between RIL, CNV, and Control plot conditions. Results from physical analysis showed that bulk density on CNV plot is higher than that on RIL and Control plot. Meanwhile, the values of porosity, available water, and permeability on CNV are less than those on RIL and Control plot. Results from chemical analysis showed that C-Organic, Total-N, available P, K, and Cation Exchange Capacity (CEC) values on CNV plot are less than those on RIL and Control values. Statistics analysis showed that the values of bulk density, porosity, available water, C-Organic, Total-N, available P, K, and KTK on CNV, RIL, and Control plot are not significantly different. Meanwhile, the values of permeability on CNV plot is significantly different from RIL and Control plot. Examined soil physical changes are increasing of bulk density, decreasing of porosity, available water, and permeability. Examined soil chemical changes are decreasing of C-Organic content, decreasing of Total-N, decreasing of available P, decreasing of K, and decreasing of Cation Exchange Capacity (CEC). Physical and chemical changes on RIL plot are less than CNV plot, which means that RIL technique is better than CNV technique.
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Judul: Effect of land use change on soil characteristics and organic matter stability of volcanic soil
Abstrak: Perubahan penggunaan lahan dari hutan menjadi lahan pertanian merupakan hal yang umum terjadi di daerah pegunungan di Indonesia. Hal ini memengaruhi karakteristik tanah, termasuk bahan organik tanah. Penelitian ini bertujuan untuk mengetahui pengaruh perubahan penggunaan lahan dari hutan menjadi penggunaan lahan lain terhadap karakteristik tanah dan stabilitas bahan organik. Sampel tanah diambil di sekitar lereng Gunung Gede dan Pangrango mewakili penggunaan lahan, diantaranya hutan alami, hutan pinus, kebun teh dan lahan hortikultura. Sampel tanah dianalisis di laboratorium untuk menentukan sifat fisik, kimia dan mineral tanah dari penggunaan lahan yang berbeda. Analisis laboratorium yang dilakukan, antara lain: tekstur, pH tanah, C-organik, total N, kapasitas tukar kation (KTK), basa-basa dapat ditukar, retensi P, kelimpahan Al, Fe, Si dan C yang diekstrak amonium oksalat (Alo, Feo, Sio) dan natrium pirofosfat (Alp, Fep, Sip, Cp) serta analisis mineral pasir dan klei. Hasil penelitian menunjukkan morfologi dan klasifikasi tanah pada masingmasing penggunaan lahan cenderung sama. Profil tanah hutan alami, hutan pinus dan kebun teh termasuk ke dalam ordo Inceptisol, kecuali pada lahan hortikultura tergolong ke dalam ordo Andisol. Perubahan penggunaan lahan dari hutan alam menjadi hutan pinus dan lahan pertanian seperti perkebunan teh dan hortikultura memengaruhi karakteristik tanah diantaranya meningkatkan bobot isi tanah, menurunkan pH tanah, C-organik, total N, kapasitas tukar kation (KTK), dan kejenuhan basa, terutama pada lapisan atas. Mineral pasir yang dominan pada semua penggunaan lahan adalah augit dan hipersten, sedangkan mineral klei didominasi oleh kaolinit dan illit dimana tanah hutan memiliki variasi mineral klei lebih banyak dibanding tanah pada lahan pertanian. Stabilitas bahan organik yang digambarkan oleh Alp, Fep, dan Cp (hasil ekstraksi pirofosfat), menggambarkan unsur-unsur tersebut yang membentuk kompleks logam-humus. Pengelolaan lahan, kondisi lingkungan serta kadar Al dan Fe pada masing-masing penggunaan lahan diduga memengaruhi kompleks Al-Fe humus. Kecenderungan Al dan Fe dalam membentuk senyawa kompleks-humus yang digambarkan melalui rasio (Alp+Fep)/(Alo+Feo) paling tinggi terdapat pada hutan alami, diikuti hutan pinus, kebun teh dan lahan hortikultura. Dengan demikian, ada indikasi penggunaan lahan dengan pengelolaan yang semakin intensif dapat menurunkan stabilitas bahan organik., Land use change from forest to agricultural land is common in mountainous areas of Indonesia. This affects soil properties, including soil organic matter. This study aims to determine the effect of land use change from forest to other land uses on soil characteristics and organic matter stability. Soil samples were collected on the slopes of Gede and Pangrango Mounts representing land uses including natural forest, pine forest, tea plantation, and horticultural land. Soil samples were analyzed in the laboratory to determine the physical, chemical, and mineral properties of soils from different land uses. Laboratory analyses included: texture, soil pH, organic C, total N, cation exchange capacity (CEC), exchangeable bases, P retention, abundance of Al, Fe, Si, and C extracted ammonium oxalate (Alo, Feo, Sio), and sodium pyrophosphate (Alp, Fep, Cp). Mineral analysis of sand and clay was also performed. The findings showed that the soil morphology and classification in each land uses tend to be similar. The soil profiles of natural forest, pine forest and tea plantation belong to the Inceptisols order, except for horticultural land belonging to the Andisols order. Land
Keyword: land use, organic matter stability, soil properties

Judul: Trichomonas Gallinae Penyebab Trichomonosis Pada Unggas
Abstrak: Trichomonas gallinae adalah protozoa yang bergerak aktof dengan keempat flagella yang mempunyai layar dan pada salah satu sisinya terdapat membran seperti sirip ikan yang berombak. Spesies dari genus Trichomonas ini mempunyai arti penting pada unggas, karena dapat menyebabkan infeksi pada alat pencernaan bagian atas.
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