Judul: Prediksi Simpanan dan Penyerapan Karbon Menggunakan Model InVEST di Taman Nasional Tesso Nilo, Riau
Abstrak: Perubahan iklim adalah masalah serius yang dihadapi manusia saat ini yang disebabkan oleh aktivitas manusia dengan merubah tutupan lahan hutan menjadi non-hutan serta penggunaan bahan bakar fosil sehingga melepas karbon ke atmosfer, dalam konteks perubahan iklim di bumi hutan memiliki dua peranan, yaitu hutan menyimpan dan menyerap karbon. Taman Nasional Tesso Nilo mengalami perubahan luasan tutupan lahan tiap tahunnya, sehingga perlu dilakukan prediksi perubahan tutupan lahan dan mengestimasi simpanan dan penyerapan karbon dengan model InVEST. Pada tahun 2013-2021 kawasan hutan sekunder Taman Nasional Tesso Nilo mengalami penurunan luasan sebesar 10.879 hektare dan peningkatan tertinggi yaitu pada sawit dengan luas 8.026 hektare. Pada tahun prediksi menggunakan Cellular Automata(CA) Markov, kawasan hutan sekunder Taman Nasional Tesso Nilo tahun 2030 mengalami penurunan 6.388 hektare sedangkan sawit meningkat 4.624 hektare. Simpanan karbon dari seluruh simpanan karbon di Taman Nasional Teso Nillo tahun 2013 yaitu sebesar 10,7 ton karbon, sedangkan pada prediksi yaitu tahun 2030 menurun menjadi 6,7 ton karbon., Climate change is a serious problem facing humans today caused by human activities by changing forest land cover to non-forest and the use of fossil fuels so as to release carbon into the atmosphere, in the context of climate change on earth, forests have two roles, forests store and absorb carbon. Tesso Nilo National Park has a very important role in overcoming this problem. Tesso Nilo National Park experiences changes in land cover area every year, so it is necessary to predict land cover changes and estimate carbon storage and sequestration using the InVEST model. In 2013-2021 the secondary forest area of Tesso Nilo National Park has a decrease in area of 10.879 hectares and the highest increase was in Palm Oil with an area of 8.026 hectares. In the prediction year using Cellular Automata (CA) Markov, the Tesso Nilo National Park Secondary Forest area in 2030 decreased by 6,388 hectares while oil palm increased by 4.624 hectares. Carbon storage of all carbon deposits in Tesso Nilo National Park in 2013 amounted to 10.7 tons of carbon, while the prediction is that in 2030 it will decrease to 6.7 tons of carbon.
Keyword: Carbon Storage and Sequestration, Cellular Automata Markov, InVEST, Land Cover Prediction, Climate Change

Judul: Pendugaan simpanan karbon atas permukaan tanah berdasarkan perubahan tutupan lahan di Taman Nasional Alas Purwo
Abstrak: Taman Nasional Alas Purwo (TNAP) merupakan salah satu kawasan konservasi yang mengalami perubahan tutupan lahan dan simpanan karbon yang disebabkan oleh faktor alam ataupun faktor manusia, yakni kebakaran hutan, perambahan lahan, berlakunya sistem PHBM Perhutani sebelum alih status kawasan, abrasi pantai, dan kegiatan pengelolaan TN. Perubahan tutupan lahan berkorelasi positif dengan simpanan karbon, jika luasan tutupan lahan mengalami perubahan maka simpanan karbon juga berubah. Simpanan karbon di TNAP memiliki kisaran rata-rata antara 21.17 Mg.ha-1 sampai 212.41 Mg.ha-1. Tipe tutupan lahan yang memiliki simpanan karbon terbesar adalah hutan dataran rendah, sedangkan yang terendah adalah savana. Total simpanan karbon yang tersimpan di TNAP pada periode 2005 sampai 2010 mengalami penurunan sebesar 296 587.67 Mg.C (3.96%). Pada periode 2010 sampai 2014 mengalami penurunan simpanan karbon sebesar 241 325.51 Mg.C (3.36%). Emisi rujukan simpanan karbon di TNAP cenderung menurun 56 215.91 Mg.C per tahun.
Keyword: alas purwo national park, carbon, land cover, reference emission level

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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