Judul: Potensi Acacia mangium dalam mengikat karbon : studi kasus di RPH Maribaya, BKPH Parung Panjang, Jawa Barat
Abstrak: Untuk mengatur pengurangan efek gas rumah kaca di negara-negara berkembang dalam upaya melaksanakan pembangunan lestari, maka dikembangkanlah Mekanisme Pembangunan Bersih (Clean Development Mechanism, CDM). Dimana salah satu programnya yaitu penurunan efek gas rumah kaca melalui kegiatan fiksasi karbon dengan cara pembangunan hutan kembali (aforestasi dan reforestasi) Dalam kaitannya dengan hal tersebut, perlu diketahui perubahan simpanan karbon yang terjadi pada vegetasi hutan, baik pada karbon tanah maupun karbon dalam biomassa suatu hamparan tanaman, mengingat hutan merupakan paru-paru dunia dengan kapasitas menyimpan karbon yang sangat besar. Penelitian mengenai simpanan karbon pada vegetasi hutan dilakukan di Puslitbanghut Bogor dan menggunakan sampel tanaman dan tanah yang berasal dari RPH Maribaya yang berada di bawah pengelolaan BKPH Parungpanjang, KPH Bogor, Perum Perhutani Unit III, Jawa Barat. Tanaman yang menjadi obyek penelitian adalah Acacia mangium umur 3, 5, 8 dan 10 tahun beserta undergrowth di bawahnya. Metode yang digunakan adalah metode destructive sampling, sedangkan proses pengolahan data menggunakan persamaan alometrik. Berdasarkan hasil penelitian, diketahui bahwa total biomassa dari tegakan Acacia mangium berbeda untuk tiap kelas umur 3, 5, 8 dan 10 tahun dengan nilai masing-masing sebesar 19 ton/ha; 40,37 ton/ha; 61,48 ton/ha dan 106.90 ton/ha. Dengan total biomassa tersebut tegakan Acacia mangtum diperkirakan mampu menyerap karbon dari atmosfer sebesar 9.5 ton C/ha; 20, 18 ton C/ha; 30,74 ton C/ha dan 53,45 ton C/ha masing-masing untuk tegakan umur 3, 5, 8 dan 10 tahun. Untuk undergrowth, dengan nilai R sebesar 0,0218% maka tidak ditemukan hubungan antara biomassa dan kandungan karbon undergrowth dengan coverage dan height. Sedangkan untuk analisis data karbon tanah, disimpulkan bahwa kadar karbon akan semakin berkurang dengan bertambahnya kedalaman tanah Sedangkan kerapatan isi dari tanah memiliki kecenderungan untuk meningkat dengan bertambahnya kedalaman tanah.
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Judul: Model persamaan alometrik biomassa dan massa karbon pohon Akasia mangium (Acacia mangium Willd.): studi kasus pada HTI Akasia mangium di BKPH Parung Panjang, KPH Bogor, Perum Perhutani Unit III Jawa Barat dan Banten
Abstrak: Increasing concentrations of greenhouse gases like carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFC), perfluorocarbons (PFC) and sulfur hexafluoride (SF6) in the atmosphere already have environmental impacts caused by rising air temperature at the earth. Forests can absorb greenhouse gases by way of transforming CO2 from the air to deposit the carbon stored in trees. Acacia mangium is a fast growing tree species having ability to tolerate wide-range soil conditions, which make this spesies attractive for tree planting in critical lands. This research was conducted in Acacia mangium plantation forest at Parung Panjang Sub-District, Bogor District, Perum Perhutani Unit III, West Java and Banten. The objective of this research are (1) to learning the carbon content of tree biomass component, (2) to learning the allometric equation models for biomass and carbon mass estimation and (3) estimating the carbon stocks of Acacia mangium plantation. Selection of sample trees in each diameter class were conducted by purposive sampling, starting from diameter class 0-5 cm to those of 35-40 cm. Laboratory tests were conducted to determine the carbon content of tree biomass component. Selection of the best equation was conducted by using allometric regression based on the highest R2(adj). The results of the case study on Acacia mangium stands, showed that there is a differences in carbon content of tree biomass component (roots, stems, branches, twigs and leaves). The highest carbon mass is in the main stem of the tree, and the lowest is in the leaves. The model of tree biomass allometric equation of Acacia mangium is W = 0,140928 D2,31 and tree carbon mass allometric equation is C = 0,060255 D2,39. Potency of carbon stocks in Acacia mangium plantation forest at Parung Panjang Sub-District was 25,4183 ton/ha.
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Judul: Pengujian Virus Newcastle Disease Gen VII Isolat Lapang Sebagai Virus Standar Pada Uji Tantang Vaksin
Abstrak: This study was conducted to determine the standard of Newcastle disease virus Gene VII field isolate as a virus challenge to vaccine test. A virus suspension that has previously been tested by HA test then titrated with EID50 using 30 Specific Pathogen Free (SPF) of 10 day old chicken embryonated eggs. In addition, chicken lethal dose50 (CLD50) test were used to determine the virus titer that could cause 50% death of the chicken population. The CLD50 test was used 25 day-old-chickens (DOC) divided into 5 groups. The virus was diluted from 10-1 to 10-8. The 104 to 10-8 dilution of NDV was infected to every group of chicken via eyedrop and intranasal with 0.1 ml/chicken dosage. Haemagglutination test showed that the allantoic fluid were contain high titers of NDV is 512 HAU. The infective NDV that had been titrated by EID50 test showed the virus titers is 109 EID50/0.1 ml or 1010 EID50/ml and the virus titers of CLD50 test e.i 106.48 CLD50/0.1 ml or 107.48 CLD50/ml. These results can be concluded that the NDV Gene VII field isolates were most appropriate to be used as a standard virus to vaccine test
Keyword: Newcastle Disease Virus Gene VII, HA tes, EID50 test, CLD50 test