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The dynamics of radial growth of three selected tropical tree species studied through knife-cutting method


Wang, Kang Han and Sahri, Mohd Hamami and Salleh @ Japri, Mohd Nazre (2013) The dynamics of radial growth of three selected tropical tree species studied through knife-cutting method. Pertanika Journal of Tropical Agricultural Science, 36 (S). pp. 117-132. ISSN 1511-3701; ESSN: 2231-8542


Tropical trees which lack distinct growth rings have caused difficulty in estimating the growth rate of those trees. This has resulted in limited knowledge concerning tropical tree growth pattern and rate of increment. This study aimed to assess the radial growth and cell production rate of three selected tropical species, namely, Macaranga gigantea, Endospermum diadenum and Dipterocarpus costulatus, with different diameters at breast height. For this purpose, knife-cutting method was adopted in this study. A knife was inserted through the bark into the outer xylem of a tree to wound the cambium and remove immediately. Wood discs containing wound area were collected from living trees after a period of time. Transverse sections of 20-25 µm in thickness were obtained through sliding microtome and dehydrated in a graded series of ethyl alcohol before staining with safranin and fast green. Dibutyl phthalate xylene (DPX) was used as a mounting medium for preparation of permanent microscope slides. The species-related anatomical response to wounding was identified and used to define the time of marking. Results show that radial growth rate and cell production rate varied across species and tree sizes. M. Gigantean and E. Diadenum showed faster growth rates than D. Costulatus, especially in small diameter classes. Meanwhile, D. Costulatus had the lowest growth rate and cell production rate. Thus, both the pioneer species are thus considered to grow faster in smaller stem size than larger stem size, while the study succeeding species grow faster in larger stem size than smaller stem size.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Forestry
Publisher: Universiti Putra Malaysia Press
Keywords: Anatomical response; Growth ring; Pinning method; Radial growth; Tropical trees
Depositing User: Muizzudin Kaspol
Date Deposited: 25 Nov 2015 06:00
Last Modified: 03 Nov 2017 04:12
URI: http://psasir.upm.edu.my/id/eprint/32074
Statistic Details: View Download Statistic

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