Malays. Appl. Biol. (1998) 27(1 & 2): 87-90
EFFECTS OF SHADING ON THE INITIAL GROWTH OF TEN INDIGENOUS MALAYSIAN TIMBER SPECIES
MOHD ZAKI HAMZAH
Faculty of Forestry, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
ABSTRACT
An experiment was conducted at Universiti Putra Malaysia, Bintulu, Sarawak to study the effects of 40% shade (60% relative light intensity) on the growth of ten indigenous timber species for 18 months. Shorea leprosula Miq. attained the highest total growth increment (diameter and height of 2.23 cm and 174.3 cm., respectively) and survival rate of 79%, followed by Hopea beccariana Burck., Shorea ovala Dyer ex. Brandis and Shorea gibbosa Grandis. The study suggested that the four species showed the highest survival and growth with 60% relative light intensity. The growth performance of Calophyllum sp., Eugenia sp. and Durio zibethinus Murray was unfavourable and Hopea kerangasensis Ashton was the slowest.
ABSTRAK
Satu kajian telah dijalankan di Universiti Putra Malaysia, Bintulu, Sarawak untuk melihat kesan 40% teduhan (60% intensiti cahaya) ke atas pertumbuhan 10 spesies pokok tempatan selama 18 bulan. Shorea leprosula Miq. mempunyai jumlah pertambahan pertumbuhan yang terbesar (pertambahan garispusat 2.23 cm dan pertambahan tinggi 174.3 cm, masing-masing) dan kadar kemandirian yang terbaik dengan 79%, diikuti oleh Hopea beccariana Burck., Shorea ovata Dyer ex. Brandis dan Shorea gibbosa Grandis. Hasil kajian mencadangkan bahawa empat spesies berkenaan adalah paling sesuai dengan 60% intensiti cahaya (dari segi kemandirian dan pertumbuhan). Kajian juga mendapati bahawa tiada perbezaan bererti di antara prestasi pertumbuhan Calophyllum sp., Eugenia sp. dan Durio zibethinus Murray, sementara Hopea kerangasensis Ashton merupakan spesies yang paling lambat pertumbuhannya.
Key words: Enrichment planting, light requirement
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