Potensi Karbon Tersimpan Hutan Tanaman Industri Acacia Mangium Berdasarkan Pendekatan Biomassa Per Kelas Umur di IUPHHK-HTI PT. Sumatera Riang Lestari

Abstract

The stored carbon potential of Acacia manginum plantation forest based on the biomass per age class approach at IUPHHK-HTI of PT. Sumatera Riang Lestari has been studied to find out the biomass, stored carbon and the value of environmental service of carbon absorption. This study was conducted at the IUPHHK-HTI area belongs to PT. Sumatera Riang Lestari, Sei Kebaro Sector in the area of Labuhan Batu Selatan and Padang Lawas Utara Districts which is geographically located at 100°10’32” East Longitude - 100°24’47” East Longitude and 01°26’20” North Latitude - 01°37’30” North Latitude. The samples for this study were selected through non-destructive sampling technique using alometric equation and the proportional parts of Acacia manginum trees (Elias et al., 2010; Purwitasari, 2011). The sample plot used was in circular shape with an area of 400 m2 or diameter of 22.56 m. The primary data selected from each plot were diameter at breast height and total height, while the value of environmental service were obtained from CO2 absorption and CO2 stored in the form of biomass referring to the carbon prices at New South Wales Stock Exchange (Capoor and Ambrosi, 2009 in Rahmat, 2010). The result of the study on 15 sample plots selected showed that the amount of biomass obtained per age class were 9.60 tons/ha for Age Class I; 66.97 tons/ha for Age Class II; 159.02 tons/ha for Age Class III; 273.96 tons/ha for Age Class IV and 429.05 tons/ha for Age Class V with stored carbon potential per age class was 4.89 tons/ha for Age Class I; 34.14 tons/ha for Age Class II; 81.06 tons/ha for Age Class III; 139.65 tons/ha for Age Class IV; and 218.70 tons/ha for Age Class V and the value of environmental service obtained from CO2 absorption and CO2 Keywords: Acacia manginum, Biomass, Stored Carbon, Age Class, Environmental Service Value Obtained from COstored in the form of carbon at the IUPHHK-HTI area belongs to PT. Sumatera Riang Lestari, Sei Kebaro Sector was Rp.792.480/ha for Age Class I; Rp.5.527.597/ha for Age Class II; Rp.13.126.051/ha for Age Class III; Rp.22.613.201/ha for Age Class IV; and Rp.35.414.844/ha for Age Class V. 2 Absorption and CO2 Stored

Potensi Karbon Tersimpan Hutan Tanaman Industri Acacia mangium berdasarkan pendekatan biomassa per kelas umur di IUPHHK-HTI PT. Sumatera Riang Lestari, telah diteliti dengan tujuan mengetahui biomassa, karbon tersimpan dan nilai jasa lingkungan dari penyerapan karbon. Sebagai bahan kajian penelitian adalah Areal IUPHHK PT. Sumatera Riang Lestari Sektor Sei Kebaro di wilayah Kabupaten Labuhan Batu Selatan dan Kabupaten Padang Lawas Utara yang secara geografis terletak pada 100°10'32” BT - 100°24'47” BT dan 01°26'20'' LU - 01°37'30'' LU. Metode penelitian yang digunakan adalah sampel tanpa pemanenan (Non Destructive Sampling) dengan memakai persamaan alometrik dan proporsi bagian-bagian pohon pada tanaman Acacia mangium (elias et al., 2010; Purwitasari, 2011). Plot sampel yang digunakan berbentuk lingkaran dengan luas 400 m2 atau diameter 22,56 m. Data primer yang diambil pada masing-masing plot berupa diameter setinggi dada (dbh) dan tinggi total, sedangkan nilai jasa lingkungan dari penyerapan CO2 dan penyimpanan CO2 dalam bentuk biomassa mengacu pada harga karbon di bursa New South Wales (Capoor dan Ambrosi, 2009, dalam Rahmat, 2010). Hasil penelitian dari 15 plot contoh yang diambil menunjukan jumlah biomassa yang diperoleh per kelas umur adalah KU I sebesar 9,60 ton/ha, KU II sebesar 66,97 ton/ha, KU III sebesar 159,02 ton/ha, KU IV sebesar 273,96 ton/ha dan KU V sebesar 429,05 ton/ha dengan potensi karbon tersimpan per kelas umur adalah KU I sebesar 4,89 ton/ha, KU II sebesar 34,14 ton/ha, KU III sebesar 81,06 ton/ha, KU IV sebesar 139,65 ton/ha dan KU V sebesar 218,70 ton/ha dan nilai jasa lingkungan dari penyerapan CO2 dan Penyimpanan CO2 dalam bentuk karbon di IUPHHK-HTI PT. Sumatera Riang Lestari Sektor Sei Kebaro untuk KU I sebesar Rp.792.480/ha, KU II sebesar Rp. 5.527.597/ha, KU III sebesar Rp. 13.126.051/ha, KU IV sebesar Rp. 22.613.201/ha, dan KU V sebesar Rp. 35.414.844/ha. Kata Kunci : Acacia mangium, biomassa, karbon tersimpan, kelas umur dan nilai jasa lingkungan dari penyerapan dan penyimpanan karbon dioksida (CO2)