The response of Paraserianthes falcataria to row thinning

Tan K.C., . The response of Paraserianthes falcataria to row thinning. pp. 322-334. ISSN 0302-2935

Growth and volume analyses were made of 9-year-old Paraserianthes falcataria plantations established in 1975 and thinned in 1979 by release fellings in which rows of trees irrespective of healthy or weak ones were removed at the rate of 1 in 3 and 1 in 2 respectively to benefit the remaining crop. Thinning has resulted in a slight drop in total volume production but increased mean tree size and sawlog volumes with no clear effect on height growth. Volume m.a.i.(mean annual increament) were 41 40 and 36 m3/ha/yr respectively in the control 1 in 3 and 1 in 2 treatments. Total volume is found to culminate at between 8-9 years of age for all the treatments. Value increment analyses indicates that the advantage of thinning in crop value terms was only beginning to show from about age 9 years. Crop value increment was and will be greatly influenced by the rate at which merchantable volume increases in particular those in the 30 cm and above diameter size classes. It appears that thinning is unlikely to be justifiable unless the premium on large trees in high and the higher the return from larger logs the greater the benefit will be from thinning. The difference in growth and volume yields between the two treatments was only marginal. The likely sawlog rotation should be at approximately 11 years in areas with a site index of 22-25. Where variations in both growth and form are high as is typical of unimproved plantations of this species silvicultural method of thinning is preferred.

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Abstract

Growth and volume analyses were made of 9-year-old Paraserianthes falcataria plantations established in 1975 and thinned in 1979 by release fellings in which rows of trees irrespective of healthy or weak ones were removed at the rate of 1 in 3 and 1 in 2 respectively to benefit the remaining crop. Thinning has resulted in a slight drop in total volume production but increased mean tree size and sawlog volumes with no clear effect on height growth. Volume m.a.i.(mean annual increament) were 41 40 and 36 m3/ha/yr respectively in the control 1 in 3 and 1 in 2 treatments. Total volume is found to culminate at between 8-9 years of age for all the treatments. Value increment analyses indicates that the advantage of thinning in crop value terms was only beginning to show from about age 9 years. Crop value increment was and will be greatly influenced by the rate at which merchantable volume increases in particular those in the 30 cm and above diameter size classes. It appears that thinning is unlikely to be justifiable unless the premium on large trees in high and the higher the return from larger logs the greater the benefit will be from thinning. The difference in growth and volume yields between the two treatments was only marginal. The likely sawlog rotation should be at approximately 11 years in areas with a site index of 22-25. Where variations in both growth and form are high as is typical of unimproved plantations of this species silvicultural method of thinning is preferred.

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Item Type:	Article
Additional Information:	3 graphs; 2 tables; 2 ref. Summary (En)
AGROVOC Term:	ARBOLES MADERABLES
AGROVOC Term:	PLANTACION FORESTAL
AGROVOC Term:	ACLAREO
AGROVOC Term:	SABAH/ ESPECIES
AGROVOC Term:	CRECIMIENTO
AGROVOC Term:	MADERA PARA PULPA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:54
URI:	http://webagris.upm.edu.my/id/eprint/18842

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