Sains Malaysiana 42(10)(2013): 1517–1521

Biomass and Floristic Composition of Bangi Permanent Forest Reserve, a Twice-Logged Lowland Dipterocarp Forest in Peninsular Malaysia

(Biojisim dan Komposisi Spesies di Hutan Simpan Kekal Bangi, Suatu Hutan

Dipterokarpa Tanah Rendah yang Dibalak Dua Kali di Semenanjung Malaysia)

J.J. Lajuni & A. Latiff*

Pusat Pengajian Sains Sekitaran dan Sumber Alam, Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Diserahkan: 14 April 2013/Diterima: 12 Mei 2013

ABSTRACT

A 1 ha permanent plot was established in Bangi Permanent Forest Reserve for this study. A total of 1018 trees with a diameter at breast height (DBH) of 5 cm and above were identified, marked and measured. Their DBH ranged from 5 to 83.6 cm, where most trees fell into the 5 to 14.9 cm DBH or Class 1 (65.71%) and 1.57% of them fell into Class 7 with DBH over 65 cm. The five largest trees were from the dipterocarp family. Species with the highest Relative Dominance Value was Shorea acuminata with a value of 10.40. The total above ground biomass was 362.13 t/ha, which can be considered high for a twice-logged forest. The total basal area was 314.97 m². The species diversity Shannon-Wiener index for this plot is H=6.99 with evenness of 0.852 and 0.85 with Brillouin’s Index. Species with the highest frequency (68.39%) and highest Importance Value Index (83.80%) was Antidesma cuspidatum. There were 171 species of trees representing 113 genera and 43 families plot. Wild fruit trees and trees with ethnobotanical potential were also identified. The results of this study indicated that this forest has high biomass content and high species diversity.

Keywords: Biomass; distribution; flora; species composition; species diversity

ABSTRAK

Suatu 1 ha plot kekal telah ditubuhkan di Hutan Simpan Kekal Bangi untuk kajian ini. Sejumlah 1018 pokok dengan diameter pada paras dada (DBH) 5 cm dan ke atas telah dicam, ditanda dan diukurkan. DBH mereka berjulat daripada 5 kepada 83.6 cm, dengan kebanyakan pokok berada dalam Kelas I pada 5-14.9 cm DBH (65.71%) dan 1.57% daripadanya jatuh pada Kelas 7 dengan DBH lebih daripada 65 cm. Lima pokok yang terbesar adalah daripada famili dipterokarpa. Spesies yang mempunyai Nilai Kedominanan Relatif tertinggi adalah Shorea acuminata dengan nilai 10.40. Jumlah biojisim atas tanah adalah 362.13 t/ha, yang boleh dianggap tinggi bagi hutan yang telah dibalak dua kali. Jumlah keluasan pangkal adalah 314.97 m2. Indeks kepelbagaian spesies Shannon-Wiener adalah H=6.99 dengan kesamarataan 0.852 dan 0.85 Indeks Brillouin. Spesies yang mempunyai kekerapan tertinggi (68.39%) dan Indeks Nilai Kepentingan tertinggi (83.80%) adalah Antidesma cuspidatum. Terdapat 171 spesies pokok mewakili 113 genus dan 43 famili. Pokok buah liar dan pokok yang mempunyai potensi etnobotani juga telah dikenal pasti. Hasil daripada kajian ini menunjukkan bahawa hutan ini mempunyai biojisim dan kepelbagaian spesies yang tinggi.

Kata kunci: Biojisim; flora; kepelbagaian spesies; komposisi spesies; taburan

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*Pengarang untuk surat-menyurat; email: latiff@ukm.my