Phenotypic Variation on Agathis borneensis Warb. of Sipagimbar in Aek Nauli, North Sumatra

By : Komala, Aswandi, Rusli M.S Harahap, dan Edi Kuwato Abstract This research was conducted at the arboretum of Forestry Research Institute of Sumatra at Aek Nauli. The objective of studies were to know phenotypic variation of Agathis borneensis Warb. in the total height, stem and branch diameter, branch angle, internode length, crown width, length and width of leaves of two shoot color agathis of 7 years old. The source of wildlings was the natural stand of A. borneensis Warb. at Sipagimbar, South Tapanuli North Sumatera. t-paired test from ten sample from two shoot color (greenish and reddish brown) indicated that there were significant difference on total height, branch diameter, branch angle, internode length, crown width and length of leaves. There are no differences on stem diameter and width of leaves. It can be concluded that there are two types population of agathis at Sipagimbar. Research on anatomical and wood characteristic should be done to investigate if they are any differentiation on species or varieties and plantation agathis for in-situ conservation are recommended at Sipagimbar. Key words : Agathis borneensis Warb., phenotypic variation, conservation. Keragaman Penotipa Agathis borneensis Warb. Asal Sipagimbar di Aek Nauli Sumatera Utara Abstrak Penelitian ini bertujuan untuk mengetahui variasi penotipa Agathis borneensis Warb. asal Sipagimbar yang ditanam di arboretum Balai Penelitian dan Pengembangan Kehutanan Sumatera di Aek Nauli. Keragaman penotipa yang diamati adalah tinggi total, diameter batang dan cabang, sudut cabang, panjang internoda, lebar tajuk, panjang dan lebar daur dari dua warna pucuk agathis yang telah berumur 7 tahun. Sumber benih berasal dari tegakan alami agathis di Sipagimbar, Tapanuli Selatan Sumatera Utara. Analisis ragam terhadap sepuluh sample dari masing-masing warna pucuk (hijau dan cokelat kemerahan) mengindikasikan terdapat perbedaan dalam ukuran tinggi total, diameter dan sudut cabang, jarak internoda, dan lebar tajuk. Sedangkan diameter batang dan lebar daun tidak berbeda antar kedua warna pucuk. Diduga terdapat dua jenis populasi alami agathis di Sipagimbar. Penelitian anatomi dan karakteristik kayu sebaiknya dilakukan apabila dua populasi tersebut mengindikasikan spesies atau varietas yang berbeda dan disarankan penanaman agathis secara in-situ di Sipagimbar. Kata kunci : Agathis borneensis Warb., keragaman penotipa, konservasi. Telah diterbitkan pada : Info Hutan Vol. III No. 3, Hal 213-217, 2006 Full text dapat hubungi Aswandi (andiasw@gmail.com)