Judul: Pengembangan Bisnis Berkelanjutan dalam Rangka Restorasi Gambut di Kabupaten Siak, Provinsi Riau
Abstrak: Kebakaran hutan dan lahan (karhutla) menimbulkan dampak yang besar segi lingkungan, pendidikan, ekonomi, politik, kesehatan, dan sosial. Salah satu penyebab karhutla adalah penggunakan api dalam proses persiapan lahan. Penelitian ini dilakukan di Kabupaten Siak, Provinsi Riau dengan mengumpulkan data primer melalui observasi, Focus Group Discussion, dan wawancara; dan diperkaya dengan data sekunder. Analisis konten, Business Model Canvas, analisis biaya manfaat, analisis SWOT, dan analisis sensitivitas dilakukan untuk mengidentifikasi penyebab karhutla di gambut dan upaya terkait restorasi gambut; mengidentifikasi komoditas yang cocok diterapkan di lahan gambut; mengkaji pengembangan komoditas terpilih dan menghitung kelayakan bisnisnya. Model bisnis agroforestry karet, kopi, dan gaharu yang dipilih karena cocok secara ekologi dan layak secara finansial untuk diusahakan. Model ini memiliki NPV Rp 260.430.088, BCR 2,14, IRR 24%, dan Payback Period 2,37 tahun. Disamping memberikan manfaat ekonomi bagi masyarakat, pola pemanfaatan lahan dengan sistem agroforestry ini dapat meningkatkan jumlah serapan karbon dan merestorasi gambut, sehingga dapat berkontribusi pada agenda restorasi gambut dan capaian komitmen NDC. Kata kunci : Agroforestry, analisis biaya manfaat, karhutla, restorasi gambut, Kanvas Model Bisnis, Land and forest fires have caused a major impact on the environment, education, economy, politics, health, and social aspects. Forest and land fires is driven by the use of fire in land preparation process. This study was conducted in Siak District, Riau Province. Primary data were collected through observation, Focus Group Discussion, and interviews; and enriched with secondary data. Content analysis, Business Model Canvas, cost-benefit analysis, SWOT analysis, and sensitivity analysis were performed to identify the causes of forest and land fires in peatland; identify efforts in peatland restoration; identify suitable commodities on peatlands; and assess the development of selected commodities and calculate their business feasibility. Rubber, coffee, and agarwood agroforestry business model was selected because of its ecological suitability and financial feasibility. This model has an NPV value of Rp 260.430.088, BCR value of 2,14, IRR value of 24%, and a 2,37-year payback period. Besides providing economic benefits for the community, agroforestry system can improve carbon absorption and restore peatland. Hence, it can contribute to the peatland restoration agenda and the achievement of NDC commitments.
Keyword: Restorasi Gambut, agroforestry, Business Model Canvas, Analisis biaya manfaat, Karhutla, Agroforestry, forest and land fires, peatland restoration, Business Model Canvas, cost-benefit analysis

Judul: Estimation of Economic Value of Carbon Sequestration and Sustainable Peatland Management Strategy in Kedaton Village Kayu Agung District
Abstrak: Ekosistem gambut di Kelurahan Kedaton terdegradasi akibat penggundulan hutan, drainase buatan, kebakaran hutan dan lahan, dan konversi lahan ke pertanian dan perkebunan. Tujuan penelitian ini adalah (1) mengidentifikasi kondisi pengelolaan lahan gambut Kelurahan Kedaton, (2) mengestimasi carbon stock dan nilai ekonomi serapan karbon di lahan gambut Kelurahan Kedaton, (3) menganalisis strategi pengelolaan lahan gambut berkelanjutan Kelurahan Kedaton. Metode yang digunakan dalam penelitian ini adalah deskriptif kualitatif, persamaan allometrik, dan Analytical Hierarchy Process. Hasil penelitian menunjukkan bahwa: (1) pengelolaan Kebun Plasma Nutfah belum berjalan aktif karena kontrak kerja sama telah berakhir, dan pengelolaan lahan gambut administratif Kelurahan Kedaton belum dilakukan secara kolaboratif, (2) nilai ekonomi serapan karbon total adalah sebesar Rp 398.561.553.448 (3) program pengelolaan lahan gambut berkelanjutan di Kelurahan Kedaton yang menjadi prioritas diantaranya promosi pengetahuan dan kelembagaan tradisional di kalangan generasi muda; inisiasi forum komunikasi para pihak untuk pengelolaan dan pemanfaatan lahan gambut; RPJM/RKP kelurahan memasukkan nilai pelestarian lahan gambut; dan pengembangan rencana bisnis pengelolaan lahan gambut., Peat ecosystems in peat ecosystems in Kedaton Village are degraded due to deforestation, artificial drainage, forest and land fires, and land conversion to agriculture and plantations. The objectives of this research are (1) to identify the condition of peatland management in Kedaton Village, (2) to estimate the biomass content and carbon stock as well as the economic value of carbon sequestration in Kedaton Village peatlands, (3) to analyze sustainable peatland management strategies in Kedaton Village. The methods used in this research are descriptive qualitative, allometric equation, and Analytical Hierarchy Process. The results showed that: (1) the management of the Kebun Plasma Nutfah has not been active because the cooperation contract has ended, and the administrative peatland management of Kedaton Village has not been carried out collaboratively, (2) the economic value of total carbon sequestration is Rp 398.561.553.448 (3) priority sustainable peatland management programs in Kedaton Village include the promotion of traditional knowledge and institutions among the younger generation; initiation of a communication forum for peatland management and utilization; RPJM/RKP of the village includes the value of peatland conservation; and development of a peatland management business plan.
Keyword: restoration

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
Keyword: