BIOMASSA TUSAM (Pinus merkusii Jungh et De Vriese Tapanuli strain) PADA SEBARAN ALAMI DI SUMATERA UTARA
Sari
Tegakan alam P. merkusii strain Tapanuli merupakan salah satu simpanan karbon pada ekosistem daratan yang memiliki peranan penting dalam mitigasi perubahan iklim global. Tujuan penelitian ini adalah menyusun persamaan allometrik untuk pendugaan biomassa P. merkusii strain Tapanuli di Sumatera Utara. Lima lokasi yang diteliti meliputi Dolok Tusam Timur dan Dolok Tusam Barat (Hutan lindung); Lobugala dan Parinsoran (Areal perladangan), dan desa Tolang, Kabupaten Tapanuli Selatan (Hutan campuran). Penyusunan persamaan allometrik dilakukan dengan metode destructive sampling yang dikombinasikan dengan metode volumetrik. Jumlah sampel sebanyak 44 pohon dengan diameter antara 13,0 – 120,6 cm. Hasil penelitian menunjukkan bahwa persamaan allometrik terbaik untuk pendugaan biomassa total P. merkusii strain Tapanuli adalah Y= 0,2451(DBH)2,2757 (R² = 0,9784), persamaan untuk pendugaaan biomassa di bagian atas tanah adalah Y=0,1900(DBH)2,2730 (R² = 0,97980), dan persamaan untuk pendugaaan biomassa di bagian bawah tanah adalah Y=0,0283(DBH)2,4393 (R² = 0,90240). Estimasi kandungan biomassa total di lima lokasi yang diteliti sebagai berikut: Dolok Tusam Barat 380,8 ton/ha setara dengan 190,4 ton C/ha, Dolok Tusam Timur 375,7 ton/ha setara dengan 187,8 ton C/ha, Lobugala 186,4 ton/ha setara dengan 93,2 ton C/ha Parinsoran 97,9 ton/ha setara dengan 48,9 ton C/ha, dan Tolang 91,3 ton/ha setara dengan 45,7 ton C/ha
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DOI: https://doi.org/10.9868/ifrj.2.2.123-133
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