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Management options to optimise sawlog production from Acacia hybrid (A. mangium × A. auriculiformis) combining thinning and fertiliser treatments were applied at six sites of varying resource availability across Vietnam. Stockings at planting varying from 2000 to 1111 trees ha^-1 were thinned from 1333 to 450 trees ha^-1 (representing 27-54% thinning %) at ages 2.0-5.6 years. Tree diameter (DBH) responses to thinning were greater in the south than in the north and south central regions. Application of fertiliser at thinning increased DBH and stand volume (SV), compared with the unfertilised treatment, regardless of thinning treatment. Early thinning (at age 2-3.6 years) to 450 or 600 trees ha^-1 resulted in the greatest DBH for all diameter classes with a greater proportion of larger diameter logs. The 3-PG process-based model was applied to predict DBH and SV for all silvicultural treatments and ages. When thinning is conducted at 2-3.6 years after planting, the modelling showed that for medium and large-diameter sawlogs, the optimum rotation length is at least 5-7 years in the south and south central coast and 6-10 years in northern Vietnam.

Item Type:	Refereed Article
Keywords:	Acacias, productivity, sawlogs, silvicultural practices, 3-PG model
Research Division:	Agricultural and Veterinary Sciences
Research Group:	Forestry Sciences
Research Field:	Forestry Management and Environment
Objective Division:	Plant Production and Plant Primary Products
Objective Group:	Forestry
Objective Field:	Hardwood Plantations
UTAS Author:	Hung, TT (Mr Hung Trieu Thai)
UTAS Author:	Eyles, A (Dr Alieta Eyles)
UTAS Author:	Ratkowsky, D (Dr David Ratkowsky)
UTAS Author:	Mohammed, C (Professor Caroline Mohammed)
ID Code:	129814
Year Published:	2019
Deposited By:	TIA - Research Institute
Deposited On:	2018-12-19
Last Modified:	2019-12-10
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