Struktur Dirian Famili Rubiaceae di Sebuah Hutan Dipterokarpa Tanah Rendah, Hutan Simpan Behrang, Perak

Stand Structure of the Rubiaceae Family in a Lowland Dipterocarp Forest, Behrang Forest Reserve, Perak

Abstract

Rubiaceae adalah famili terbesar dalam kumpulan dikotiledon di Semenanjung Malaysia. Suatu kajian awal berkaitan struktur dirian dan komposisi pokok daripada famili telah dijalankan di hutan dipterokarpa tanah rendah di Hutan Simpan Behrang, Perak. Tiga plot kajian berukuran 25 m x 20 m (0.05 hektar) telah ditubuhkan secara rawak di denai terpilih. Keluasan keseluruhan plot kajian adalah 0.15 ha. Bancian melibatkan semua pokok yang diameter pada paras dada 1.0 cm ada ke atas. Pokok ditanda manakala sampel daun dikutip, diawet sebelum dicamkan ke peringkt genua atau spesies. Sebanyak 11 spesies daripada 10 genus dan 44 individu telah dibanci. Urophyllum diwakili dua spesies manakala sembilan genus lagi, masing-masing diwakili oleh satu spesies sahaja.  Kepadatan pokok bagi famili Rubiaceae adalah 293 individu per hektar. Pada peringkat genus, Chassalia mencatatkan kepadatan tertinggi iaitu sebanyak 67 individu per hektar dan ada peringkat spesies, Chassalia curviflora merupakan spesies paling padat dengan nilai kepadatan 67 individu per hektar. Kelas DBH 1.0-4.9 cm diwakili oleh bilangan individu tertinggi iaitu sebanyak 40 dirian. Kajian ini membantu menyumbang data tambahan untuk maklumat senarai flora bagi negeri Perak.

The Rubiaceae is the largest family among dicotyledons in Peninsular Malaysia. A preliminary study on the stand structure and composition of trees from this family was conducted in the lowland dipterocarp forest at Behrang Forest Reserve, Perak. Three study plots measuring 25 m x 20 m (0.05 hectares) were randomly established along selected trails. The total plot area was 0.15 ha. The survey involved all trees with a diameter at breast height (DBH) of 1.0 cm and above. The trees were tagged, and leaf samples were collected, preserved, and identified to the genus or species level. A total of 11 species from 10 genera and 44 individuals were recorded. Urophyllum was represented by two species, while the other nine genera were each represented by a single species. The tree density for the Rubiaceae family was 293 individuals per hectare. At the genus level, Chassalia recorded the highest density, with 67 individuals per hectare, and at the species level, Chassalia curviflora was the densest species with a density of 67 individuals per hectare. The DBH class of 1.0–4.9 cm was represented by the highest number of individuals, with a total of 40 trees. This study contributes additional data to the floristic information of the state of Perak.