An estimated 50-90 percent of the traded volume of tropical timber is illegally sourced. To implement new European legislation intended to eliminate this illegal trade, independent tools will be needed to verify the legal status of timber. We therefore propose to develop a fast, accurate and cost-effective commercial forensic tool for tracing the claimed origin of tropical timber.

In March 2013, the European Union (EU) implemented the EU timber regulation (EUTR), which prohibits any illegally sourced timber from entering the EU market. The EUTR requires the timber industry to ascertain that all tropical timber traded in the EU originates from a legal source. It is implemented through a ‘due diligence system’ in which the legal status of imported tropical timber is based on certificates and trade documents. Such a ‘paper control system’ is however subject to fraud, so independent methods are increasingly needed to check the claimed origin of tropical timber.

We are developing a forensic timber tracing service, Timtrace, which independently verifies the geographical origin of tropical timber. Specifically, we use (1) stable isotopes (e.g. δ13C, δ18O, δ15N), trace elements and rare earth elements in wood that can be matched with regional reference data and (2) DNA analysis, using microsatellite markers and SNPs to distinguish trees from different populations. We apply multiple methods as this allow methodological comparisons and tracing of a large number of tropical timbers. Over the past years, we have assembled a database with stable isotope values of >13,000 entries for 50 timbers from 25 countries (Map). Using this database we are able to correlate large-scale spatial variation in δ18O in wood with isotopic signature of rain water (Figure), with potential for isotopic tracing at large spatial scales. At smaller scale, we have successfully applied microsatellites of the African timber Tali to trace the origin of timber samples to concessions in Cameroon.

Timtrace will fullfil the increasing demand for independent verification of the claimed origin of tropical timber. Interested parties and potential customers of our tracing service include: (1) customs and inspection authorities; (2) timber-processing industry; (3) NGOs and (4) organisations that certify sustainable forest management, which conduct forensic checks to underpin the credibility of their certification.

We coordinate our efforts with the Global Timber Tracking Network, in the recently launched Phase II of the project

Wood samples needed

We need wood samples of African timbers. If you can provide these wood samples, please have a look at the Timtrace sampling protocol and sample form on the right side of this page and contact us directly.

In the media

  • April 26, 2016 - Dutch news paper: "Onze planeet wordt steeds groener". Article on the ‘greening’ of the Earth, which is attributed to CO2 rise. Our Nature Geoscience paper (Van der Sleen 2014) in which we found no fertilization effect of 150 year of CO2 rise on tropical tree growth. And Mart is quoted saying that the jury is still out on CO2 fertilization effects. (NRC, Wetenschap, p.19)
  • March 12, 2015 - Dutch Radio 1: "Herkennen van illegaal hout"
    ('Criminologist on illegal timber trade' from 14:07 onwards, Timtrace from 14:13 onwards)

  • March 11, 2015 - Dutch news paper: Streepjescode herkent fout hout
    (Trouw, De verdieping pp.12-13)
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