, Volume 69, Issue 2, pp 235-243

Reconstructing harvesting diameter distribution from aggregate data

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Abstract

Context

Distribution of removed trees among species and diameter classes is usually used to characterize selection harvesting. This information is, however, rarely available when analysing past time series. The challenge is then to determine the minimal level of information required to characterize harvests.

Aims

We tested in this work whether an algorithm based on the total number of trees and volume to be removed enabled the reconstruction of harvesting diameter distributions, when combined with stand diameter distribution before harvest.

Methods

We tested the algorithm against empirical data in the case of selection system, comparing distributions by χ² tests, and extended its evaluation to more diversified theoretical situations.

Results

Observed harvesting distributions were well-reconstructed in most empirical cases, with better results when considering mean simulated distributions. The algorithm was also effective for other thinning and harvesting strategies: low thinning, thinning of dominants, and mechanical thinning, whatever the structure of the stand before being cut.

Conclusion

Total number of trees and volume harvested appeared thus sufficient to reconstruct DBH distribution of removed trees in diverse situations, provided that the distribution before harvest was known. This algorithm, therefore, enables the simulation of complex harvesting operations with minimal information.

Handling Editor: Daniel Auclair

Contribution of the co-authors

V. Lafond carried out the study and wrote this paper, under supervision of T. Cordonnier and B. Courbaud (who is also the coordinator of the BGF project). They contributed to experiment designs, writing, and multiple revisions. F. de Coligny helped to program the algorithm, and implemented it in the Capsis4 simulation platform.