Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Discussion papers
https://doi.org/10.5194/bg-2019-210
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-210
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Jun 2019

Research article | 13 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).

When trees don’t act their age: size-deterministic tree-ring standardization for long-tern trend estimation in shade-tolerant trees

Rachel Dietrich and Madhur Anand Rachel Dietrich and Madhur Anand
  • School of Environmental Sciences, University of Guelph, Guelph, N1G2W1, Canada

Abstract. With increasing awareness of the consequences of climate change for global ecosystems, the focus and application of tree-ring research has shifted to reconstruction of long-term climate-related trends in tree growth. Contemporary methods for removing the biological growth-trend from tree-ring series (standardization) are ill-adapted to shade-tolerant species, leading to biases in the resultant chronology. Further, many methods, including regional curve standardization (RCS), encounter significant limitations for species in which accurate age estimation is difficult. In this study we present and test two tree-ring standardization models that integrate tree size in the year of ring formation into the estimation of the biological growth-trend. The first method, dubbed size deterministic standardization (SDS), uses tree diameter as the sole predictor of the growth-trend. The second method includes the combined (COMB) effects of age and diameter. We show that both the SDS and COMB methods reproduce long-term trends in simulated tree-ring data better than conventional methods – this result is consistent across multiple species. Further, when applied to real tree-ring data, the COMB method is more parsimonious than its than RCS. We recommend the inclusion of tree size in the year of ring formation in future tree-ring standardization models, particularly when dealing with shade-tolerant species, as it does not compromise model parsimony and allows for the inclusion of unaged trees.

Rachel Dietrich and Madhur Anand
Interactive discussion
Status: open (until 25 Jul 2019)
Status: open (until 25 Jul 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Rachel Dietrich and Madhur Anand
Rachel Dietrich and Madhur Anand
Viewed  
Total article views: 191 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
156 35 0 191 8 1 1
  • HTML: 156
  • PDF: 35
  • XML: 0
  • Total: 191
  • Supplement: 8
  • BibTeX: 1
  • EndNote: 1
Views and downloads (calculated since 13 Jun 2019)
Cumulative views and downloads (calculated since 13 Jun 2019)
Viewed (geographical distribution)  
Total article views: 166 (including HTML, PDF, and XML) Thereof 164 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 22 Jul 2019
Publications Copernicus
Download
Short summary
In shade tolerant tree species growth is not strictly related to tree age. In this study we show that novel tree ring standardization (biological growth trend removal) models which incorporate tree size in the year of ring formation produce more accurate chronologies than those produced by contemporary, age-based, standardization models. These findings are important for accurate and reliable long-term trend reconstruction in tree ring studies in all species but especially shade tolerant species.
In shade tolerant tree species growth is not strictly related to tree age. In this study we show...
Citation