Citation
Teejuntuk Sakhan, . and Khlangsap Somphat, . and Jamroenprucksa Monton, . and Wachrinrat Chongrak, . and Paungchit Ladawan, . (2006) Effect of thinning on growth and yield of Acacia mangium-Dipterocarpus alatus mixed plantation. In: 8th Round-Table Conference on Dipterocarps: Dipterocarps - Enhancing Capacities in Sustainable Development and Poverty Alleviation, 15-17 Nov 2005, Ho Chi Minh City (Vietnam).
Abstract
A study on the effect of thinning on the growth and yield of Acacia mangium and Dipteocarpus alatus was carried out in mixed stand of 5-year-old A. mangium and D. alatus at the Forest Industry Organization Takum Plantation Trat Province. The data was collected in 2003 2004 and 2005. The experimental design is randomized completely block design with three treatments and three replications: no thinning 50% thinning and clearcutting. Each plot was 15 m x 30 m. The sample trees were cut to estimate various parts of aboveground biomass through allometric correlation to estimation of stand biomass. The growth of trees were measured and calculated two tears after thinning. The results showed that the average total stem biomass commercial stem biomass branch biomass and leaf biomass of 5-year-old A. mangium were 128.9 127.2 19.1 and 7.4 kg tree-¹ or 59.7 58.9 8.8 and 3.4 t ha-¹ respectively. The average total stem volume and commercial stem volume were 0.236 and 0.227 mᶾha-¹ or 109.3 and 105.2 mᶾha-¹ respectively. Thinning levels affected the growth of trees in terms of current annual increment (CAI) and relative growth rate (RGR) of diameter at breast height and height. It was showed that CAI and RGR in thinning plots were higher than no thinning plots. In addition RGR of biomass of A. mangium also showed the same trend. However D. alatus was found to be more sensitive to thinning levels than A. mangium. The study concluded that for short and long rotation species mixed planting the thinning of 5 to 6-year-old short rotation species is recommended for increasing the growth rate and yield of trees.
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Abstract
A study on the effect of thinning on the growth and yield of Acacia mangium and Dipteocarpus alatus was carried out in mixed stand of 5-year-old A. mangium and D. alatus at the Forest Industry Organization Takum Plantation Trat Province. The data was collected in 2003 2004 and 2005. The experimental design is randomized completely block design with three treatments and three replications: no thinning 50% thinning and clearcutting. Each plot was 15 m x 30 m. The sample trees were cut to estimate various parts of aboveground biomass through allometric correlation to estimation of stand biomass. The growth of trees were measured and calculated two tears after thinning. The results showed that the average total stem biomass commercial stem biomass branch biomass and leaf biomass of 5-year-old A. mangium were 128.9 127.2 19.1 and 7.4 kg tree-¹ or 59.7 58.9 8.8 and 3.4 t ha-¹ respectively. The average total stem volume and commercial stem volume were 0.236 and 0.227 mᶾha-¹ or 109.3 and 105.2 mᶾha-¹ respectively. Thinning levels affected the growth of trees in terms of current annual increment (CAI) and relative growth rate (RGR) of diameter at breast height and height. It was showed that CAI and RGR in thinning plots were higher than no thinning plots. In addition RGR of biomass of A. mangium also showed the same trend. However D. alatus was found to be more sensitive to thinning levels than A. mangium. The study concluded that for short and long rotation species mixed planting the thinning of 5 to 6-year-old short rotation species is recommended for increasing the growth rate and yield of trees.
Additional Metadata
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. QK 495 D564R859 2005 (095003273) Call Number |
| AGROVOC Term: | Acacia mangium |
| AGROVOC Term: | Dipterocarpaceae |
| AGROVOC Term: | Mixed cropping |
| AGROVOC Term: | Thinning |
| AGROVOC Term: | Biomass |
| AGROVOC Term: | Stems |
| AGROVOC Term: | Leaf |
| AGROVOC Term: | Growth rate |
| AGROVOC Term: | Breast height diameter |
| AGROVOC Term: | Diameter increment |
| Geographical Term: | MALAYSIA |
| Depositing User: | Mr. AFANDI ABDUL MALEK |
| Last Modified: | 24 Apr 2025 00:52 |
| URI: | http://webagris.upm.edu.my/id/eprint/7479 |
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