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: Model persamaan alometrik massa karbon akar dan root to shoot ratio biomassa dan massa karbon pohon Mangium (Acacia mangium Wild): studi kasus di BKPH Parung Panjang, KPH Bogor, Perum Perhutani unit III, Jawa Barat dan Banten
Abstrak: Climate change is one of the current important environmental problems due to global warming which is caused by the increase of green house gasses concentration in the atmosphere. Through the process of photosynthesis, vegetation absorbs carbon and releases the carbon through the process of respiration. In this process, vegetation uses CO2 for the process of photosynthesis and produces O2 and energy. Some energy is stored in form of biomass. Acacia mangium is a tree species that belong to fast growing species and it is estimated to have high capability to absorb carbon. Therefore the planting of A. mangium is an important mitigation effort to reduce CO2 concentration in the atmosphere. This study had objective to obtain the model of allometric equations for the mass of tree roots of A. mangium, root to shoot ratio of biomass and carbon mass of A. mangium trees. Selection of sample trees on each dimater class was carried out by purposive sampling method. Estimation of carbon mass was applied for each part of tree consisting of roots, stems, twigs, branches, and leaves. Laboratory works were conducted for the tree samples to identify carbon content of every part of the trees. The model of allometric equation for A. mangium roots carbon mass to the diameter of trees was CA = 0,0048977D2,56 and the model of allometric equation for A. mangium roots biomass to the diameter of trees was WA = 0,00134896D2,46. The models of allometric equations for carbon mass of A. mangium tree roots to above ground biomass of tree carbon were as follows: root carbon mass to the carbon mass of stem was CA = 0,176197MB1,05, root carbon mass to the carbon mass of branches was CA = 11,74897MC0,418, root carbon mass to the carbon mass of twigs was CA = 1,706082MR1,08, root carbon mass to the carbon mass of leaves was CA = 1,261827MD1,33. Meanwhile, the model of estimation of root carbon mass to the mass of above ground trees was CA = 0,103038MT1,07 Root to shoot ratios of A. mangium tree biomass to the above ground biomass of trees were the followings; (a) root to shoot ratio of tree root biomass to the biomass of tree stem was 0,2934. (b) root to shoot ratio of tree root biomass to the biomass of all tree parts was 0.2080.Root to shoot ratios of carbon mass of A. mangium were as follows: (a) root to shoot ratio of carbon mass of tree root to the carbon mass of tree stem was 0.2437. (b) root to shoot ratio of carbon mass of tree root to the carbon mass of all above ground tree parts was 0.1952.
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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