Sains Malaysiana 45(3)(2016): 355–363

Species Diversity and Stumpage Valuation of Timber Resources at Pasir Tengkorak Forest Reserve, Langkawi, Kedah

(Kepelbagaian Spesies dan Nilai Stumpej Sumber Balak di Hutan Simpan Pasir Tengkorak, Langkawi, Kedah)

 

HAFIDZ ABDULLAH, A.G. AWANG NOOR* & I. FARIDAH-HANUM

Faculty of Forestry, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia

 

Diserahkan: 31 Julai 2014/Diterima: 24 September 2015

 

 

ABSTRACT

Tropical forests are highly diverse and provide a great deal of economic value. They play an important role in providing goods and services which contribute to long-term social benefits in local communities. This study was carried out to examine the tree composition and estimate its economic value of timber resources in a lowland coastal forest. Four one ha plots were established in Pasir Tengkorak Forest Reserve in Langkawi, Kedah and the subplots measuring 10 × 10 m were established in each plot. All trees greater than 1 cm DBH (diameter at breast height) were identified and the parameters measured included tree height and diameter. The species diversity indices obtained for all four plots were relatively high. The Simpson’s index of diversity ranges from 0.946 to 0.969, while the Shannon-Weiner index (H’) ranges from 3.808 to 5.616. The Simpson’s measure of evenness (1/D) ranges from 0.239 to 0.563 suggesting that species evenness in the four ha plots were low. Stumpage value of timber in the study area was quite high with average value of RM33,600.46 per ha. Regression analysis showed that the relationship between stumpage value and species diversity was significant at the 5% level.

 

Keywords: Economic value of timber; regression analysis; species diversity; stumpage value; tree composition

 

ABSTRAK

Hutan tropika mempunyai kepelbagaian yang tinggi dan menyumbang kepada nilai ekonomi yang tinggi. Ia memainkan peranan dalam menyediakan produk dan perkhidmatan yang menyumbang kepada faedah sosial jangka masa panjang kepada masyarakat. Objektif kajian ini adalah untuk mengkaji komposisi pokok dan menentukan nilai ekonomi sumber balak di satu kawasan hutan tanah rendah pesisir pantai. Empat plot kajian (100 × 100 m) ditandakan di Hutan Simpan Pasir Tengkorak di Langkawi, Kedah dan subplot berukuran 10 × 10 m ditanda dalam setiap plot. Kesemua pokok berdiameter 1 cm ke atas dikenal pasti dan parameter yang diambil kira termasuk diameter dan tinggi pokok. Indeks kepelbagaian spesies yang diperoleh dalam keempat-empat plot adalah tinggi. Indeks kepelbagaian Simpson mencatatkan nilai antara 0.946 dan 0.969 dengan nilai purata 0.960. Indeks Shannon-Weiner (H’) berada antara 3.808 hingga 5.616 dengan nilai purata 5.06. Pengukur kesamaan Simpson (1/D) bernilai antara 0.239 hingga 0.563 menunjukkan kesamaan spesies pada keempat-empat plot adalah rendah. Keputusan menunjukkan nilai stumpej di kawasan ini adalah tinggi dengan nilai purata RM33,600.46 setiap hektar. Analisis regresi menunjukkan hubungan antara nilai stumpej dan kepelbagaian spesies adalah signifikan pada tahap 5%.

 

Kata kunci: Analisis regresi; kepelbagaian spesies; komposisi pokok; nilai ekonomi kayu; nilai stumpej

 

 

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*Pengarang untuk surat-menyurat; email: awangnoor@gmail.com

 

 

 

 

 

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