Growth, physiological responses and wood production of an Acacia auriculiformis plantation in southern Vietnam following mid-rotation thinning, application of phosphorus fertiliser and organic matter retention

Huong, Vu Dinh; Mendham, Daniel; Beadle, C. L.; Hải, Nguyễn Xuân; Close, DC

doi:10.1016/j.foreco.2020.118211

Cited by 8 publications

(4 citation statements)

References 34 publications

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“…Commonly, local communities collect some of these materials for domestic fuel. If trees are harvested in time for replanting in June-July (rainy months), the rates of mass loss (decomposition) of slash are rapid: nearly 50% of leaf mass was lost in the first month and the remaining was lost in three months, and nearly 60% of small branch mass was lost in nine months (in press [25]). It seems unlikely that the retention of slash per se would increase the risk of fire broadly during the inter-rotation phase.…”

Section: Managing For Sustainable Productionmentioning

confidence: 99%

Sustainable Management of Acacia auriculiformis Plantations for Wood Production over Four Successive Rotations in South Vietnam

Huong

Nambiar

Hải

et al. 2020

Forests

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Vietnam’s forestry sector is facing rising demands for wood to support national and rural economies, and rural livelihoods. A feasible option to meet this demand is to improve productivity in the current plantation estates, especially in those owned by thousands of small growers. Growers have invested in short-rotation acacia plantations primarily for the woodchip market, but are being urged through government policies and pressured by certification bodies and some NGOs to shift to longer rotations, preferentially, for growing saw logs. In this context, we examined the productivity of an Acacia auriculiformis plantation in South Vietnam, over four successive rotations, spanning 25 years. We show that it is possible to increase and sustain wood production in the long term, by applying simple but integrated management practices, recognizing that the conservation of site resources is critical for sustainability. Practices which depleted site organic matter and nutrients lead to a hidden, but high, cumulative loss of production. Given the site and soil damaging practices prevalent in the country, it is likely that production foregone in those sites may be equivalent to the yield from one in every four or five rotations harvested. With sound management including the conservation of site resources, planting the best germplasm, appropriate stocking and judicious use of herbicide, total wood production and the proportion of saw logs (50–70% of the commercial wood at about 7 years of age) can be increased substantially. At the same time, these practices also can promote understory development and diversity in the stand. Such holistic benefits are possible without extending the rotation length and/or thinning, which are likely to raise the levels of risks for small growers, who are not covered by any insurance. Investments and support for small growers to enable higher productivity and value per unit area in their holdings, through sustainable management, would offer practical and low-risk options for the benefits of growers, processors and ecosystems.

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Section: Managing For Sustainable Productionmentioning

confidence: 99%

Sustainable Management of Acacia auriculiformis Plantations for Wood Production over Four Successive Rotations in South Vietnam

Huong

Nambiar

Hải

et al. 2020

Forests

Self Cite

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“…This indicates that thinning increased the merchantable volume and the number of large saw logs. For 9-year-old A. auriculiformis plantation (1,333 stem/ha), the medium sized saw logs formed the major proportion of saw logs obtained from the unthinned plot (Huong et al 2020a). Thinning is important for improving the DBH class of a stand as well as the merchantable volume and is usually used as a plantation management strategy to increase growth and utilization.…”

Section: Stem Volume Merchantable Volume and Sawlogsmentioning

confidence: 99%

“…It is commonly practiced in fast-growing trees species such as Eucalyptus, A. auriculiformis, and Acacia hybrid (Hung et al 2019;Huong et al 2020a). As a management practice in a plantation, thinning is used to reduce the number of trees in a stand, so as to increase the crown space between the remaining trees, to reduce the crown and root competition, and to increase growth.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thinning on Growth and Wood Production of Naturally Regenerated 8-Year-Old Acacia Mangium Willd. Plantation on Abandoned Mining Area, Southern Thailand

Wongprom,

Maelim,

Chandaeng

et al. 2023

BIOTROPIA

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Thinning is an important practice for promoting growth and maintaining forest plantation for wood production from the remaining trees. In this study, thinning was carried out in a naturally regenerated 8-year-old Acacia mangium plot in the Phangnga Forestry Research Station. Three thinning schemes, with 175 (T1), 300 (T2) and 600 (T3) remaining trees/ha, were compared with the control (no thinning) of 831 trees/ha. The diameter at breast height (DBH) and height (H) of the trees were measured. The differences in growth, current annual increment (CAI), aboveground biomass, and stem volume (V) were analyzed. We observed that the thinning of A. mangium increased the growth rate, with the DBH being clearly affected by thinning. CAIDBH increased significantly, with the DBH class of thinned A. mangium plots also improving after thinning. The stem volume and aboveground biomass of T3 plot was similar to the control plot after thinning. In addition, the number of large saw logs was the highest in T3 plot. The large saw logs can be used for multi-utilization and have a high value. These results suggest that thinning can promote stem growth, and increase the proportion of large saw logs in naturally regenerated A. mangium stands.

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“…Recovery of sawlogs depends on dimensional and other requirements, as well as silvicultural practices and harvesting procedures. Observations from short-rotation plantations in Vietnam indicate that sawlog content in final harvesting may vary from 28% to 68% depending on whether the plantation is thinned (Huong et al 2020). Bucking simulations based on a stand database from Finland has indicated that clear-cuts of spruce and pine might yield 65% and 68% of sawlogs, respectively.…”

Section: Introductionmentioning

confidence: 99%

Empirical observations of the yield of logs from trees of the boreal region

Kärenlampi¹

2022

BALT FOR

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The yield of sawlogs and plywood logs from boreal trees is discussed. First, taper curves are used to compute geometric (maximal) sawlog and plywood log contents. Then, a quality reduction is implemented, according to previously published models. Finally, the outcome is verified using empirical observations. Regarding spruce trees, the different estimates of sawlog content agree. In the case of birch and pine trees, the estimates differ. The sawlog and plywood log yield from large trees is greater than prognosticated one, probably due to missing over-aged trees in the empirical data. The yield of sawlogs and plywood logs from small trees is smaller than prognosticated one, most of the empirical data originating from thinnings with a focus on the quality of the remaining trees. The sawlog content of individual trees from clearcutting displays a skew distribution around the expected value. The distribution in thinning trunks shows a binary component, with a large proportion of trees with zero sawlog content. Keywords: sawlog; plywoodlog; Picea abies; Betula species; Pinus sylvestris

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Growth, physiological responses and wood production of an Acacia auriculiformis plantation in southern Vietnam following mid-rotation thinning, application of phosphorus fertiliser and organic matter retention

Cited by 8 publications

References 34 publications

Sustainable Management of Acacia auriculiformis Plantations for Wood Production over Four Successive Rotations in South Vietnam

Sustainable Management of Acacia auriculiformis Plantations for Wood Production over Four Successive Rotations in South Vietnam

Effect of Thinning on Growth and Wood Production of Naturally Regenerated 8-Year-Old Acacia Mangium Willd. Plantation on Abandoned Mining Area, Southern Thailand

Empirical observations of the yield of logs from trees of the boreal region

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