Sains Malaysiana 46(3)(2017): 359–363

http://dx.doi.org/10.17576/jsm-2017-4603-01

Sap Flow Study on Two Different Diameter Sizes of Tectona grandis

(Kajian Resapan Sap ke atas Saiz Diameter Berbeza bagi Tectona grandis)

MARRYANNA LION*, SITI-AISAH SHAMSUDDIN & WAN MOHD SHUKRI WAN AHMAD

Forest Research Institute Malaysia (FRIM), 52109 Kepong, Selangor Darul Ehsan, Malaysia

Received: 17 March 2015/Accepted: 21 June 2016

ABSTRACT

Sap flow pattern of Tectona grandis planted at lowland forest assessed. This study aimed to determine the sap movement of two different diameter sizes T. grandis. Two sizes selected were 16 and 38 cm in diameter at breast height (dbh). Sap flow meter (SFM) used to assess the sap velocity rates at the interval of 30 min within 24 h for 15 days. Diurnal sap flow of T. grandis shows that mean velocity is high during day time compared night time. Small diameter has high sap flow compared to that of bigger diameter. A flow rates was high at the inner layer and less at outer layer for smaller tree. The variation was vice versa when the tree was getting bigger. Variations in sap flow of T. grandis characterized by several environmental factors. It was found that size contribute in the differed sap flow of T. grandis.

Keywords: Diameter sizes; lowland forest; sap flow; Tectona grandis

ABSTRAK

Kajian telah dilakukan terhadap corak aliran sap bagi Tectona grandis yang ditanam di hutan tanah rendah. Tujuan kajian ini ialah untuk menentukan pergerakan sap bagi dua diameter dirian pokok T. grandis yang berbeza. Dua saiz yang dipilih adalah 16 dan 38 cm diameter pada paras dada (ppd). Alat pengesan aliran sap (Sap flow meter - SFM) digunakan untuk menilai kadar halaju sap pada selang 30 minit dalam tempoh 24 jam selama 15 hari. Purata aliran siang malam oleh T. grandis menunjukkan bahawa halaju purata adalah tinggi pada waktu siang berbanding waktu malam. Saiz diameter yang kecil mempunyai aliran sap yang lebih tinggi berbanding dengan diameter yang besar. Bagi saiz diameter pokok yang kecil, kadar aliran sap adalah tinggi di lapisan dalaman berbanding lapisan luar. Corak perbezaan ini akan menjadi sebaliknya apabila saiz pokok tersebut semakin besar. Variasi dalam aliran sap T. grandis dicirikan oleh beberapa faktor persekitaran. Penemuan mendapati bahawa saiz diameter pokok menyumbang kepada perbezaan aliran sap pada T. grandis.

Kata kunci: Aliran sap; hutan tanah rendah; saiz diameter; Tectona grandis

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*Corresponding author; email: marryanna@frim.gov.my