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Consequences of vertical basic wood density variation on the estimation of aboveground biomass with terrestrial laser scanning

(2021) TREES-STRUCTURE AND FUNCTION. 35(2). p.671-684
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Abstract
Terrestrial laser scanning (TLS) is used to generate realistic 3D tree models that enable a non-destructive way of quantifying tree volume. An accurate value for basic wood density is required to convert tree volume into aboveground biomass (AGB) for forest carbon assessments. However, basic density is characterised by high inter-, intra-species and within-tree variability and a likely source of error in TLS-derived biomass estimates. Here, 31 adult trees of 4 important European timber species (Fagus sylvatica, Larix decidua, Pinus sylvestris, Fraxinus excelsior) were scanned using TLS and then felled for several basic wood density measurements. We derived a reference volume-weighted basic density (ρw) by combining volume from 3D tree models with destructively assessed vertical density profiles. We compared this to basic density retrieved from a single basal disc over bark (ρbd), two perpendicular pith-to-bark increment cores at breast height (ρic), and sourcing the best available local basic wood density from publications. Stump-to-tip trends in basic wood density caused site-average woody AGB estimation biases ranging from −3.3 to + 7.8% when using ρbd and from −4.1 to + 11.8% when using ρic. Basic wood density from publications was in general a bad predictor for ρw as the bias ranged from −3.2 to + 17.2%, with little consistency across different density repositories. Overall, our density-attributed biases were similar to several recently reported biases in TLS-derived tree volume, leading to potentially large compound errors in biomass assessments with TLS if patterns of vertical basic wood density variation are not properly accounted for.
Keywords
Plant Science, Ecology, Forestry, Physiology, cavelab, Forest inventory, Quantitative structure modelling, Increment coring, Terrestrial lidar, Carbon stocks, CARBON STOCK, TREE BIOMASS, SCOTS PINE, VOLUME, MODELS, GRAVITY, RING, PREDICTION, GROWTH, BEECH

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Citation

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MLA
Demol, Miro, et al. “Consequences of Vertical Basic Wood Density Variation on the Estimation of Aboveground Biomass with Terrestrial Laser Scanning.” TREES-STRUCTURE AND FUNCTION, vol. 35, no. 2, 2021, pp. 671–84, doi:10.1007/s00468-020-02067-7.
APA
Demol, M., Calders, K., Krishna Moorthy Parvathi, S., Van den Bulcke, J., Verbeeck, H., & Gielen, B. (2021). Consequences of vertical basic wood density variation on the estimation of aboveground biomass with terrestrial laser scanning. TREES-STRUCTURE AND FUNCTION, 35(2), 671–684. https://doi.org/10.1007/s00468-020-02067-7
Chicago author-date
Demol, Miro, Kim Calders, Sruthi Krishna Moorthy Parvathi, Jan Van den Bulcke, Hans Verbeeck, and Bert Gielen. 2021. “Consequences of Vertical Basic Wood Density Variation on the Estimation of Aboveground Biomass with Terrestrial Laser Scanning.” TREES-STRUCTURE AND FUNCTION 35 (2): 671–84. https://doi.org/10.1007/s00468-020-02067-7.
Chicago author-date (all authors)
Demol, Miro, Kim Calders, Sruthi Krishna Moorthy Parvathi, Jan Van den Bulcke, Hans Verbeeck, and Bert Gielen. 2021. “Consequences of Vertical Basic Wood Density Variation on the Estimation of Aboveground Biomass with Terrestrial Laser Scanning.” TREES-STRUCTURE AND FUNCTION 35 (2): 671–684. doi:10.1007/s00468-020-02067-7.
Vancouver
1.
Demol M, Calders K, Krishna Moorthy Parvathi S, Van den Bulcke J, Verbeeck H, Gielen B. Consequences of vertical basic wood density variation on the estimation of aboveground biomass with terrestrial laser scanning. TREES-STRUCTURE AND FUNCTION. 2021;35(2):671–84.
IEEE
[1]
M. Demol, K. Calders, S. Krishna Moorthy Parvathi, J. Van den Bulcke, H. Verbeeck, and B. Gielen, “Consequences of vertical basic wood density variation on the estimation of aboveground biomass with terrestrial laser scanning,” TREES-STRUCTURE AND FUNCTION, vol. 35, no. 2, pp. 671–684, 2021.
@article{8686606,
  abstract     = {{Terrestrial laser scanning (TLS) is used to generate realistic 3D tree models that enable a non-destructive way of quantifying tree volume. An accurate value for basic wood density is required to convert tree volume into aboveground biomass (AGB) for forest carbon assessments. However, basic density is characterised by high inter-, intra-species and within-tree variability and a likely source of error in TLS-derived biomass estimates. Here, 31 adult trees of 4 important European timber species (Fagus sylvatica, Larix decidua, Pinus sylvestris, Fraxinus excelsior) were scanned using TLS and then felled for several basic wood density measurements. We derived a reference volume-weighted basic density (ρw) by combining volume from 3D tree models with destructively assessed vertical density profiles. We compared this to basic density retrieved from a single basal disc over bark (ρbd), two perpendicular pith-to-bark increment cores at breast height (ρic), and sourcing the best available local basic wood density from publications. Stump-to-tip trends in basic wood density caused site-average woody AGB estimation biases ranging from −3.3 to + 7.8% when using ρbd and from −4.1 to + 11.8% when using ρic. Basic wood density from publications was in general a bad predictor for ρw as the bias ranged from −3.2 to + 17.2%, with little consistency across different density repositories. Overall, our density-attributed biases were similar to several recently reported biases in TLS-derived tree volume, leading to potentially large compound errors in biomass assessments with TLS if patterns of vertical basic wood density variation are not properly accounted for.}},
  author       = {{Demol, Miro and Calders, Kim and Krishna Moorthy Parvathi, Sruthi and Van den Bulcke, Jan and Verbeeck, Hans and Gielen, Bert}},
  issn         = {{0931-1890}},
  journal      = {{TREES-STRUCTURE AND FUNCTION}},
  keywords     = {{Plant Science,Ecology,Forestry,Physiology,cavelab,Forest inventory,Quantitative structure modelling,Increment coring,Terrestrial lidar,Carbon stocks,CARBON STOCK,TREE BIOMASS,SCOTS PINE,VOLUME,MODELS,GRAVITY,RING,PREDICTION,GROWTH,BEECH}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{671--684}},
  title        = {{Consequences of vertical basic wood density variation on the estimation of aboveground biomass with terrestrial laser scanning}},
  url          = {{http://dx.doi.org/10.1007/s00468-020-02067-7}},
  volume       = {{35}},
  year         = {{2021}},
}

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