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

Diserahkan: 17 Mac 2015/Diterima: 21 Jun 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

RUJUKAN

Cermak, J. & Kucera, J. 1981. The compensation of natural temperature gradient at the measuring point during the sap flow determination in tree. Biologia Plantarum (Praha) 23: 469-471.

Cienciala, E., Kucera, J., Lindorth, A., Cermak, J., Grelle, A. & Halldin, S. 1997. Canopy transpiration from a boreal forest in Sweden during a dry year. Agriculture Forest Meteorology 86: 157-167.

Diawara, A., Loustau, D. & Berbigier, P. 1991. Comparison of two methods for estimating the evaporation of a Pinus pinaster (Ait.) stand: Sap flow and energy balance with sensible heat flux measurements by an eddy covariance method. Agricultural and Forest Meteorology 54: 49-65.

Du, Z.C. & Yang, Z.G. 1995. Comparative study on the characteristics of photosynthesis and transpiration in Aneurolepidium chinensis of different soil types. Acta Bot. Sin. 37(1): 66-73.

Lagergren, F. & Lindorth, A. 2002. Transpiration response to soil moisture in pine and spruce trees in Sweden. Agriculture Forest Meteorology 112: 67-85.

Olbrich, B.W. 1991. The verification of the heat pulse velocity technique for estimating sap flow in Eucalyptus grandis. Canadian Journal of Forest Research 21: 836-841.

Scott D. F. 2005. On the hydrology of industrial timber plantations. Hydrological Processes 19(20): 4203-4206.

Smith, D.M & Allen, S.J. 1996. Measurement of sap flow in plant stems. Journal of Experimental Botany 47(305): 1833-1488.

Nisbet, T. 2005. Water use by trees. Forestry Commission Information Note. ISSN 1460-3802. pp. 1-8.

Weibel, F.P. & De Vos, J.A. 1994. Transpiration measurement on apple trees with an improved stem heat balance method. Plant and Soil 166: 203-219.

*Pengarang untuk surat-menyurat; email: marryanna@frim.gov.my