Development of total aboveground volume equations for seven important forest tree species in France

Vallet, Patrick; Dhôte, Jean‐François; Moguédec, Gilles Le; Ravart, Michel; Pignard, Gérôme

doi:10.1016/j.foreco.2006.03.013

Cited by 95 publications

(81 citation statements)

References 24 publications

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“…Using this model, the product of the estimated b stem parameter value (0.52) times the constant (4/π), i.e., 0.66, can be interpreted as the ratio of the stem volume to that of a cylinder having the same diameter at breast height and the same height (form factor). This value (0.66) was not significantly different from that (0.62) obtained by the model of Vallet et al (2006) 1984). Although this stem model differed from the corresponding empirical one by its basic form and its global instead of local/covariate fitting, it had quite similar statistical performances.…”

Section: Structural Approachcontrasting

confidence: 53%

Improving the robustness of biomass functions: from empirical to functional approaches

Hounzandji

Jonard

Nys

et al. 2014

Annals of Forest Science

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Abstract& Key message We developed precise, consistent, generic, and robust biomass equations for seven aboveground tree components of sessile and pedunculate oaks. These equations can be used to accurately estimate carbon stocks and fluxes in and out of the forest. & Context Large uncertainties still persist when using existing biomass equations for larger scale applications. & Aims The objective of this study was to test two contrasting modeling approaches to obtain biomass estimates of various components (stem, stem wood, stem bark, crown, and three branch categories) for Quercus petraea and Quercus robur and to compare them in terms of predictive capacity, genericity, consistency, and robustness. & Methods All models were calibrated on a total of 117 oak trees sampled over a wide range of sites and stands and further tested on an independent data set of 33 trees. The "empirical" approach consisted in declining a common allometric equation based on two variables (diameter at breast height and total height) into all its possible forms and selecting the final model on purely statistical performances; the "structural" method was based on the fitting of a priori dedicated model forms for each component to allow a clear interpretation of the model parameters. & Results For the stem components, both approaches resulted in similar statistical performances despite difference in model forms and number of parameters. Although equally performant on the validation data set for the total crown, only the structural model gave satisfactory results when applied to the independent data set. Both approaches failed to accurately predict the branch fractions on the validation data set. & Conclusion Using physically based model forms increased the robustness of the biomass equations.

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Section: Structural Approachcontrasting

confidence: 53%

Improving the robustness of biomass functions: from empirical to functional approaches

Hounzandji

Jonard

Nys

et al. 2014

Annals of Forest Science

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“…It is becoming the trend for implementing the monitoring and assessment of national forest biomass to develop generalized single-tree biomass models suitable for large scale forest biomass estimation. In fact, a lot of efforts for large scale forest biomass estimation have been made in the world, and many researchers have attempted to establish generalized single-tree biomass models suitable for national, regional even global forest biomass estimation [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A New General Allometric Biomass Model

2011

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Abstract:To implement monitoring and assessment of national forest biomass, it is becoming the trend to develop generalized single-tree biomass models suitable for large scale forest biomass estimation.Considering that the theoretical biomass allometric model developed by West et al. [1,2] was statistically different from the empirical one, the two parameters in the most commonly used biomass equation M=aD b were analyzed in this paper. Firstly, based on the knowledge of geometry, the theoretical value of parameter b was deduced, i.e., b=7/3(≈2.33), and the comparison with many empirical studies conducted throughout the globe indicated that the theoretical parameter could describe soundly the average allometric relationship between aboveground biomass M and D (diameter on breast height). Secondly, using five datasets of aboveground biomass which consisted of 1441 M ， D pairs of sample trees, the new general biomass allometric model was validated. Finally, the relationship between parameter a and wood density p was analyzed, and the linear regression was developed. The new model, which is not only simple but also species-specific, offers a feasible approach on establishment of generalized biomass models for regional and national forest biomass estimation.

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“…The competition-induced mortality is simulated through a simple algorithm that relies on the RDI. The model uses some other allometric relationships such as a stem taper model, a crown length model, an aboveground volume model [28] and a root biomass model [29] to obtain some additional tree features.…”

Section: Growth Modelmentioning

confidence: 99%

The Impact of Windstorm Damage in the Assessment of the Carbon Balance in Even-Aged Fagus sylvatica L. Stands

Fortin

Albrecht²,

Kohnle³

et al. 2014

Forests

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Due to the fact that forest ecosystems can potentially mitigate the impact of climate change, the carbon balance of managed forests has caught the attention of a large scientific community. Some authors conclude that extending rotation lengths would actually favour the climate change mitigation effect since more carbon would be stored in the biomass on the average. However, when the occurrence of catastrophic disturbances such as windstorms is not considered, the advantage of extending the rotation length might be overestimated for some species. In this study, we addressed this issue by coupling a growth model, a windstorm damage model and a carbon assessment tool. The evolution of an even-aged European beech (Fagus sylvatica L.) stand was simulated under three different rotation lengths. Simulations including stochastic windstorm events were run and compared with deterministic simulations with no catastrophic disturbance. Our results indicate that when disturbances caused by storms were not taken into account, the carbon balance was actually overestimated in some cases and that this overestimation increased with the rotation length. In our case study, omitting windstorm damage resulted in an overestimation as large as 8% for the longer rotation length. Nevertheless, when windstorm damage was taken into account in the simulation, the longer rotation length still stored more carbon on the average than shorter rotation lengths. However, the marginal gain in carbon storage induced by the increase of the rotation length was reduced.

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Development of total aboveground volume equations for seven important forest tree species in France

Cited by 95 publications

References 24 publications

Improving the robustness of biomass functions: from empirical to functional approaches

Improving the robustness of biomass functions: from empirical to functional approaches

A New General Allometric Biomass Model

The Impact of Windstorm Damage in the Assessment of the Carbon Balance in Even-Aged Fagus sylvatica L. Stands

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