Cambial activity of Dipterocarpus costulatus in relation to different stem diameters and climate factors

Amir Affan Abdul Azim, . and Wang K. H., . and M. H. Sahri, . Cambial activity of Dipterocarpus costulatus in relation to different stem diameters and climate factors. pp. 581-588. ISSN 0128-1283

This study investigated the seasonal cambial activity in Dipterocrpus costulatus trees with different range of stem diameter at breast height (dbh). Samples from main stem of D. costulatus with dbh 15 cm and 25 cm growing in natural lowland dipterocarp rainforest of west Peninsular Malaysia were collected for this purpose. Collections of cambial samples were carried out in 2-month intervals from August 2010 till June 2011. Cambial activity was determined by counting the numbers of cambial and expansion zone cell layers towards the outer sapwood. A greater number of cell layers indicated greater cambial activity. Results showed that the cambium of trees with dbh 15 cm were influenced by the amount of rainfall. However cambium of trees with dbh 25 cm showed relatively less sensitivity to rainfall. Dipterocrpus costulatus showed active and inactive phases during the observation period. Thus this study has proven that this species did not grow continually at the same rate in natural forests. Instead it showed periods of alternate active and inactive growth.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v26n4/58...

Abstract

This study investigated the seasonal cambial activity in Dipterocrpus costulatus trees with different range of stem diameter at breast height (dbh). Samples from main stem of D. costulatus with dbh 15 cm and 25 cm growing in natural lowland dipterocarp rainforest of west Peninsular Malaysia were collected for this purpose. Collections of cambial samples were carried out in 2-month intervals from August 2010 till June 2011. Cambial activity was determined by counting the numbers of cambial and expansion zone cell layers towards the outer sapwood. A greater number of cell layers indicated greater cambial activity. Results showed that the cambium of trees with dbh 15 cm were influenced by the amount of rainfall. However cambium of trees with dbh 25 cm showed relatively less sensitivity to rainfall. Dipterocrpus costulatus showed active and inactive phases during the observation period. Thus this study has proven that this species did not grow continually at the same rate in natural forests. Instead it showed periods of alternate active and inactive growth.

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Item Type:	Article
AGROVOC Term:	Dipterocarpus
AGROVOC Term:	Stems
AGROVOC Term:	Climate change
AGROVOC Term:	Rainfall
AGROVOC Term:	Xylem
AGROVOC Term:	Growth stages
AGROVOC Term:	Forest reserves
AGROVOC Term:	Rain forests
AGROVOC Term:	Cambium
AGROVOC Term:	Relative humidity
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	26 Apr 2025 03:15
URI:	http://webagris.upm.edu.my/id/eprint/21328

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