Response of unmanaged Acacia mangium plantations to delayed thinning in north-east Thailand

Tiyanon S., . and Vacharangkura T., . and Viriyabuncha C., . and Thaingam R., . and Kamo K., . and Sakai M., . Response of unmanaged Acacia mangium plantations to delayed thinning in north-east Thailand. pp. 223-234. ISSN 0128-1283

The effects of delayed thinning on the survival and growth of residual trees in 14-year-old unmanaged Acacia mangium stands in north-eastern Thailand were studied for 8.3 years. Two types of row-thinning were used: alternate-row thinning and every-third-row thinning plus selective thinning of the remaining two rows. Both types reduced mortality of residual trees to less than 26 of that in the unthinned stand. Both types also increased stand and individual stem volume compared with the unthinned stand. The stimulation of volume increment occurred with 1.2 years of thinning but lasted for only about 3 years. Trees of all sizes responded although increased volume increment was greatest for larger trees. During the 8.3 years alternate-row and third-row plus low thinning increased total stand volume increment by 5.8 and 4.2 times above that of the unthinned stand. Both thinning regimes also promoted greater production of merchantable wood volume. Of the two thinning methods alternate-row thinning was superior to third-row plus low thinning in terms of total stand volume increment and merchantable volume production. Our results indicated that previously unmanaged stands of A. mangium were still capable of responding to thinning with increased volume growth even when the treatment was delayed 10 years beyond the time normally recommended for the species.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v21n3/22...

Abstract

The effects of delayed thinning on the survival and growth of residual trees in 14-year-old unmanaged Acacia mangium stands in north-eastern Thailand were studied for 8.3 years. Two types of row-thinning were used: alternate-row thinning and every-third-row thinning plus selective thinning of the remaining two rows. Both types reduced mortality of residual trees to less than 26 of that in the unthinned stand. Both types also increased stand and individual stem volume compared with the unthinned stand. The stimulation of volume increment occurred with 1.2 years of thinning but lasted for only about 3 years. Trees of all sizes responded although increased volume increment was greatest for larger trees. During the 8.3 years alternate-row and third-row plus low thinning increased total stand volume increment by 5.8 and 4.2 times above that of the unthinned stand. Both thinning regimes also promoted greater production of merchantable wood volume. Of the two thinning methods alternate-row thinning was superior to third-row plus low thinning in terms of total stand volume increment and merchantable volume production. Our results indicated that previously unmanaged stands of A. mangium were still capable of responding to thinning with increased volume growth even when the treatment was delayed 10 years beyond the time normally recommended for the species.

[error in script]

Item Type:	Article
AGROVOC Term:	Acacia mangium
AGROVOC Term:	Plantations
AGROVOC Term:	Thinning
AGROVOC Term:	Mortality
AGROVOC Term:	Stand density
AGROVOC Term:	Soil moisture
AGROVOC Term:	Stand characteristics
AGROVOC Term:	Wood production
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/21681

Actions (login required)

View Item