Growth rates of Eucalyptus and other Australian native tree species derived from seven decades of growth monitoring

Ngugi, Michael R.; Doley, David; Cant, Mark; Botkin, Daniel B.

doi:10.1007/s11676-015-0095-z

Cited by 17 publications

(19 citation statements)

References 19 publications

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“…A similar renewal of long-term observations in forests was reported by Ngugi et al (2014Ngugi et al ( , 2015 who were able to relocate and remeasure similar management plots in eucalypt forests Southern and Central Queensland. One concerns the extensive series of trials and growth plots in North Queensland rainforests previously established by the former Queensland Forestry Department.…”

Section: Renewing Long-term Studies and Resurrecting Institutional Mesupporting

confidence: 77%

Long‐term ecological monitoring and institutional memories

Lamb¹

2017

Eco Management Restoration

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Summary Many important ecological management issues can only be addressed by long‐term monitoring or through studies carried out over extended periods. But such studies require institutional settings that ensure funding is sustained and that data arising from these studies are securely managed. Recent experience suggests both are difficult to achieve. This is because management agencies and research bodies are periodically restructured, especially in recent years. This has often led to long‐term work being terminated. But there is anecdotal evidence that the data collected in at least some of these studies are not always lost. Instead, it can remain stored in the back rooms of agencies or in the personal files of former staff. Such data are clearly at risk; with time fewer people remain aware of the work or of the existence of data that were collected, thereby increasing the likelihood that the information will eventually disappear. This seems a waste. Securing funds for any long‐term ecological study is always likely to be difficult, and many of these previous long‐term studies are likely to be relevant to some of our present management problems. One approach to taking advantage of these earlier studies would be to ask scientific and professional associations to survey their older members to identify relevant previous investigations. But any re‐establishment of former studies will require the creation of new institutional arrangements, more robust institutional memories and sufficient funds that are able to sustain any resurrected investigations into the future.

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Section: Renewing Long-term Studies and Resurrecting Institutional Mesupporting

confidence: 77%

Long‐term ecological monitoring and institutional memories

Lamb¹

2017

Eco Management Restoration

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“…This implies that when tree age is estimated using tree DBH and the observed PAI, the tree age is likely to be overestimated or underestimated. For the interim and in the absence of rigorous radiocarbon‐based calibration data and where applicable, the mean bias estimates (%) provided in Table 1 for various PAI measures could be cautiously used as PAI correction factors for Australian native species growth estimates presented in Ngugi et al (2015).…”

Section: Discussionmentioning

confidence: 99%

“…Although only 12 trees were radiocarbon dated, the results provided opportunity for preliminary calibration of diameter‐based age estimation methods and the development of tentative PAI correction factors. For provisional tree age estimation using PAI, it is recommended that bias correction factors (%) provided in Table 1 of this study be cautiously used to adjust tree diameter growth rates (Ngugi et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…The tree growth data used for calculating periodic annual increment (PAI) were obtained from 126 native forest permanent inventory plots monitored between 1952 and 1989 within the 1600 mm annual rainfall isohyet along southeast Queensland coastal areas and on Fraser Island (Ngugi et al 2015). PAI was calculated as the change in individual tree diameter between two consecutive measures as a function of time.…”

Section: Methodsmentioning

confidence: 99%

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Ageing culturally significant relic trees in southeast Queensland to support bushfire management strategies

Ngugi¹,

Knight

Hua

et al. 2020

Eco Management Restoration

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Appropriate fire management strategies are needed to protect forests and large old ecologically and culturally significant trees in natural landscapes. The aim of this study was to determine the age of large old and relic trees of cultural significance that included Cypress Pine (Callitris columellaris F. Muell.), a species that is sensitive to crown scorching fires in a fire-prone landscape, and to calibrate a tree-growth-rate method for estimating tree age. Twelve large trees were dated using radiocarbon ( 14 C) dating. The trees are located on North Stradbroke Island (Indigenous name: Minjerribah), southeast Queensland (Australia) in a fire-prone landscape where recent wildfires have destroyed many large trees. The median tree ages ranged from 155 to 369 years. These results suggest an important role of past Indigenous land management practices in protecting Cypress Pine from crown scorching fires. The tree-growth-rate-based method for estimating tree age generally overestimated the age derived from radiocarbon dating. Bias correction factors were developed for correcting various measures of periodic growth rates. This study provides evidence that appropriate lowintensity fire strategies have the potential to contribute to the survival of forests and conserve large old trees.

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“…A third set of data used for the study included 34 plots measured in publically managed (Crown) native forests in Southeast Queensland. All the plots were rectangular and varied in size from 0.2 to 0.5 ha and collected in the last 50 years as a part of the long-term Native Forest Permanent sample Plots (NFPP) network (Ngugi et al 2014;Ngugi et al 2015). All measured individual trees had dbh >10 cm and only individual trees marked for thinning were used for this analysis.…”

Section: Native Forest Inventory Datasetsmentioning

confidence: 99%

Estimating potential harvestable biomass for bioenergy from sustainably managed private native forests in Southeast Queensland, Australia

et al. 2018

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Background: Australia's energy future is at the crossroads and the role of renewable sources is in focus. Biomass from sustainably managed forests provide a significant opportunity for electricity and heat generation and production of liquid fuels. Australia has extensive native forests of which a significant proportion are on private land. However, there is limited knowledge on the potential capacity of this resource to contribute to the expansion of a biomass for bioenergy industry. In addition, there are concerns on how to reconcile biomass harvesting with environmental protection. Methods: We used regional ecosystem vegetation mapping for Queensland to stratify harvestable forests within the 1.8 m hectares of private native forests present in the Southeast Queensland bioregion in 2014. We used a dataset of 52,620 individual tree measurements from 541 forest inventory plots collected over the last 10 years. Tree biomass was estimated using current biomass allometric equations for Australia. Biomass potentially available from selective sawlog harvesting and silvicultural treatment across the bioregion was calculated and mapped. Results: Current sawlog harvesting extracts 41.4% of the standing tree biomass and a biomass for bioenergy harvest would retain on average 36% of felled tree biomass on site for the protection of environmental and fauna habitat values. The estimated area extent of harvestable private native forests in the bioregion in 2013 was 888,000 ha and estimated available biomass for bioenergy in living trees was 13.6 million tonnes (t). The spotted gum (Corymbia citriodora subsp. variegata) forests were the most extensive, covering an area of 379,823 ha and with a biomass for bioenergy yield of 14.2 t•ha −1 (with approximately 11.2 t•ha −1 of the biomass harvested from silvicultural thinning and 3 t•ha −1 recovered from sawlog harvest residual). Conclusions: Silvicultural treatment of private native forests in the Southeast Queensland bioregion, has the capacity to supply a large quantity of biomass for bioenergy. The availability of a biomass for bioenergy market, and integration of sawlog harvesting and silvicultural treatment operations, could provide land owners with additional commercial incentive to improve the management of private native forests. This could potentially promote restoration of degraded forests, ecological sustainability and continued provision of wood products.

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Growth rates of Eucalyptus and other Australian native tree species derived from seven decades of growth monitoring

Cited by 17 publications

References 19 publications

Long‐term ecological monitoring and institutional memories

Long‐term ecological monitoring and institutional memories

Ageing culturally significant relic trees in southeast Queensland to support bushfire management strategies

Estimating potential harvestable biomass for bioenergy from sustainably managed private native forests in Southeast Queensland, Australia

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