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A. Cunn adalah salah satu jenis tanaman pokok yang dikembangkan pada Hutan Tanaman Industri Pulp (HTI) sebagai bahan baku pulp dan kertas. Permasalahan pada jenis tanaman ini, produktivitasnya masih rendah serta daurnya masih panjang. Untuk kesinambungan suplai kayu, maka perusahaan HTI menurunkan daur tanaman dari umur 6 tahun menjadi umur 4-5 tahun agar bahan baku kayu tetap tersedia sesuai kebutuhan Industri. Penelitian ini bertujuan untuk mengkaji dampak penurunan daur terhadap nilai produksi dan sifat kayunya, kondisi ekologis serta aspek sosial. Metode penelitian dilakukan dengan membuat plot sampling pada areal HTI untuk mengamati aspek produksi dan sifat kayunya yang meliputi parameter volume pohon, sifat kayu dan nilai financial sedangkan aspek sosial difokuskan pada serapan tenaga kerja terhadap pengelolaan HTI. Hasil kajian menunjukkan bahwa produksi tertinggi pada umur antara 4 -5 tahun, diindikasikan dengan tercapainya daur teknis dan ekonomis pada umur tersebut. Sedangkan sifat kimia dan dimensi serat kayunya tergolong kualitas I dan II dari umur 4-6 tahun, dengan rendamen tertinggi pada kayu umur 4 tahun. Aspek sosial khususnya penyerapan tenaga kerja menunjukkan nilai terbesar pada daur umur 4 tahun. Berdasakan hasil kajian ini diperoleh bahwa penurunan daur HTI tidak berdampak negatif terhadap pengelolaan hutan lestari. ABSTRACT Keywords: Acacia crassicarpa, decrease of plantation rotation, sustainable forest management Acacia crassicarpaA. Cunn is one among the that developed in industrial timber plantations and used as raw material for pulp and paper industries. Generally this plantation has two main problems, which are low productivity and long time rotation. The problems have made industrial timber plantations reduced the rotation from six years to four and five years to fulfill the requirement for wood intake. The research aims at evaluating the effect of reduction rotation on productivity, wood properties, and financial aspect. This research used sample plots of 0,1 ha for each stand age to observe the aspects of production and properties of wood, and used labor demand approach to observe social and financial aspects. The result showed that the highest productivity rates of occurred at the fourth and fifth years. The wood properties aspect show that the pulp quality of at the age of 4-6 years is classified into the first and second quality class. The social and financial aspects, especially the labor showed that the highest rate demand occurred in the fourth. The result also showed that the reduction of rotation does not have negative effect on the principles of sustainable forest management. A. crassicarpaA. crassicarpa A. crassicarpa ABSTRAK Kata kunci : Hutan tanaman, , lahan gambut, daur

Krasikarpa wood (Acacia crassicarpa A. Cunn.) is one of the fast growing peatland species for pulp and paper production. Pulp and chemical properties of krasikarpa wood under 4 years old have not been studied intensively. This paper examines pulp and chemical properties of krasikarpa wood during 1-4 years growth. Wood samples were taken from peatland area of Industrial Plantation Forest, PT. Arara Abadi, Riau. Chemical content examined includes extractives content in the solubility of ethanol benzene, lignin, and cellulose contents, while pulp properties studied were basic density, pulp productivity, and wood consumption. Wood samples were cooked using kraft pulping method with 18% alkali active, 25% sulfidity, wood to liquor ratio of 1:4, and temperature of cooking at 165°C for 3 hours. Experiment was designed based on Completely Randomized Design. Results showed that the age factor had a significant effect on all aspects studied. Based on further testing of LSD (Least Significant Differences

Terentang wood (Campnosperma auriculata Hook.f) is relatively low in specific gravity (0.3), hence its utilization as pulp by chemi-mechanical is an alternative process. Energy consumption was reduced by applying lignin degrading fungi (Phanerochaete chrysosporium) as pretreatment in the chemi-mechanical process. This paper examines the effects of P. chrysosporium incubation periods into chemical components and energy refining consumption of terentang wood. Four percent of NaOH was used in the chemi-mechanical process, and incubation periods studied were 0 (control), 3, 4 and 5 weeks. Results showed that P. chrysosporium significantly affected the weight loss, chemical properties, and refining energy consumption of terentang wood pulping process. Wood chip weight loss was about 15.95-21.31% and alpha-cellulose raised up to 6.77%. Five weeks incubation time decreased lignin content up to 22.97% and saved the refining energy up to 22.7%.

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