Judul: CO2 Emissions from Acacia Industrial Plantation Forest Peatlands in Riau Province
Abstrak: This study aims to determine the amount of CO2 emissions from soil (Root Cut and Control Plot) and relations with subsidence, rainfall, soil temperature, soil moisture and wáter table on peatlands Forest Plantation Industry in Langgam, Riau. CO2 emissions from soil was measured using closed chamber method. CO2 sample capture done before closed the chamber (0 minute) and after 6 minutes closed. Measurements result of CO2 emission cumulative from soil in September 2008 to July 2009 was 2563.16 mgCm-2h-1 for the Root Cut plot and 2629.41 mgCm-2h-1 for the Control plot. Based on the results of regression and correlation analysis, factors such as rainfall, subsidence, soil temperature, soil moisture and water table have an influence on the production of CO2. Correlation and regression value between CO2 cumulative and subsidence cumulative with the type of multy positions was (R2=0.86 ; p=0.00) for the Root Cut plot and (R2=0.84 ; p=0.00) for the Control plot, with a negative correlation value of each (-0.92 ; -0.91). Multy positions measurement between CO2 emissions from soil was corerelated with rainfall at (R2=0.50 ; p=0.015) for the Root Cut plot and (R2=0.59 ; p=0.004) for the Control plot, with a negative corelation value of each (-0.71 ; - 0.79). The relationship of CO2 emissions rate from the soil with soil temperature by multy positions type was (R2=0.51 ; p=0.010) for the Root Cut plot and (R2=0.35 ; p=0.026) for the Control plot, with a negative corelation value of each (0.73 ; 0.66). The relationship of CO2 emissions rate from the soil with soil moisture by multy positions type was (R2=0.45 ; p=0.023) for the Root Cut plot and (R2=0.39 ; p=0.039) for the Control plot, with a negative corelation value of each (-0.67 ; -0.63). The relationship of CO2 emissions rate from the soil with wáter table by multy positions type was (R2=0.36 ; p=0.050) for the Root Cut plot and (R2=0.43 ; p=0.028) for the Control plot, with a negative correlation value of each (-0.60 ; -0.66).
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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: Berbagai jenis vaksin marek pada ayam
Abstrak: Penyakit Marek merupakan penyakit menular pada ayam yang disebabkan oleh virus herpes (DNA) ditandai dengan in filtrasi sel-sel neoplasma, pleomorf dan limfosit pada sya raf dan organ tubuh lainnya. Penyakit ini cukup menimbulkan kerugian pada peternak ayam di seluruh dunia termasuk Indonesia, untuk itu usaha pencegahan terhadap penyakit ini terus dilakukan. Vaksinasi merupakan suatu cara yang efektif untuk pencegahan penyakit Marek. dianggap paling Vaksinasi biasa- nya dilakukan di peternakan ayam pembibit diberikan pada ayam umur 1 hari. Vaksin Marek ada 4 macam yaitu: Vaksin HVT, atenuasi, avirulen dan polivalen yang merupakan cam- puran dari ketiga jenis vaksin tersebut. Kelemahan vaksin HVT, atenuasi dan avirulen adalah ku rang atau tidak efektif terhadap beberapa galur virus Marek di alam selain dipengaruhi oleh maternal antibodi dari HVT atau yang homolog. Ternyata kelemahan-kelemahan seper ti ini tidak berlaku bagi vaksin polivalen. Oleh Witter (1982) dinyatakan bahwa vaksin polivalen paling efektif di bandingkan dengan vaksin Marek tunggal. Vaksin polivalen belum dipasarkan secara meluas dan masih merupakan barang baru. Diharapkan kehadiran vaksin polivalen ini dapat menggantikan vaksin HVT yang biasa digunakan di lapangan….
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