Stable Isotopes in Tree Rings of Tropical Forests

Sleen, Peter van der; Zuidema, Pieter A.; Pons, Thijs L.

doi:10.1007/978-3-030-92698-4_22

Cited by 2 publications

(1 citation statement)

References 112 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…How stable isotopes composition varies will depend on the site and species-specific response to these different changing environmental factors (Helle and Schleser, 2004;Poussart and Schrag, 2005;van der Sleen et al, 2017). Up to now, several stable isotopes analyses have been done in Bolivia (Brienen et al, 2012;Nijmeijer, 2012;van der Sleen, 2014;Baker et al, 2015;van der Sleen et al, 2015) focusing on different species and sites. However, it is required to assess the species and site specific variation before performing discrimination analysis for timber tracking purposes.…”

Section: Stable Isotopes Prospective To Trace Timber Originmentioning

confidence: 99%

Tropical timber forensics : a multi-methods approach to tracing Bolivian Cedrela

Paredes-Villanueva¹

View full text Add to dashboard Cite

Combating illegal timber trade requires the ability to identify species and verify geographic origin of timber. Forensic techniques that independently verify the declared species and geographic origin are needed, as current legality procedures are based on certificates and documents that can be falsified. Timber from the genus Cedrela is among the most economically valued tropical timbers worldwide. Three Cedrela species are included in the Appendix III of CITES: C. fissilis, C. odorata, and C. angustifolia (listed as C. lilloi). Cedrela timber is currently traded with false origin declarations and under a different species name, but tools to verify this are lacking. We used Direct Analysis in Real Time Time-of-Flight Mass Spectrometry (DART-TOFMS) to chemically identify Cedrela species and sites of origin. Heartwood samples from six Cedrela species (the three CITESlisted species plus C. balansae, C. montana, and C. saltensis) were collected at 11 sites throughout Bolivia. Mass spectra detected by DART-TOFMS comprised 1062 compounds; their relative intensities were analysed using Principal Component Analyses (PCA), Kernel Discriminant Analysis (KDA), and Random Forest analyses to check discrimination potential among species and sites. Species were identified with a mean discrimination error of 15-19%, with substantial variation in discrimination accuracy among species. The lowest error was observed in C. fissilis (Mean=4.4%). Site discrimination error was considerably higher: 43-54% for C. fissilis and 42-48% for C.odorata. These results provide good prospects to differentiate C. fissilis from other species, but at present there is no scope to do so for other tested species. Thus, discrimination is highly species specific. Our findings for tests of geographic origin suggest no potential to discriminate at the studied scale and for the studied species.Cross-checking results from different methods (KDA and Random Forest) reduced discrimination errors. In all, the DART-TOFMS technique allows independent verification of claimed identity of certain Cedrela species in timber trade.

show abstract

Section: Stable Isotopes Prospective To Trace Timber Originmentioning

confidence: 99%

Tropical timber forensics : a multi-methods approach to tracing Bolivian Cedrela

Paredes-Villanueva¹

View full text Add to dashboard Cite

show abstract

Shining a new light on the classical concepts of carbon‐isotope dendrochronology

Wieloch

2024

New Phytologist

View full text Add to dashboard Cite

SummaryRetrospective information about plant ecophysiology and the climate system are key inputs in Earth system and vegetation models. Dendrochronology provides such information with large spatiotemporal coverage, and carbon‐isotope analysis across tree‐ring series is among the most advanced dendrochronological tools. For the past 70 years, this analysis was performed on whole molecules and, to this day, 13C discrimination during carbon assimilation is invoked to explain isotope variation and associated climate signals. However, recently it was reported that tree‐ring glucose exhibits multiple isotope signals at the intramolecular level (see Wieloch et al., 2024). Here, I estimated the signals' contribution to whole‐molecule isotope variation and found that downstream processes in leaf and stem metabolism each introduce more variation than carbon assimilation. Moreover, downstream processes introduce most of the climate information. These findings are inconsistent with the classical concepts/practices of carbon‐isotope dendrochronology. More importantly, intramolecular tree‐ring isotope analysis promises novel insights into forest metabolism and the climate of the past.

show abstract

Stable Isotopes in Tree Rings of Tropical Forests

Cited by 2 publications

References 112 publications

Tropical timber forensics : a multi-methods approach to tracing Bolivian Cedrela

Tropical timber forensics : a multi-methods approach to tracing Bolivian Cedrela

Shining a new light on the classical concepts of carbon‐isotope dendrochronology

Contact Info

Product

Resources

About