Journal of Wood Science

, Volume 56, Issue 3, pp 175–183

Stable carbon isotopes of tree rings as a tool to pinpoint the geographic origin of timber

Article

DOI: 10.1007/s10086-009-1085-6

Cite this article as:
Kagawa, A. & Leavitt, S.W. J Wood Sci (2010) 56: 175. doi:10.1007/s10086-009-1085-6

Abstract

Illegal logging is a major cause of worldwide deforestation, and demands for scientific methods to identify the geographic origin of timber are increasing. “Dendroprovenancing” is one such method, in which the origin of unknown wood is estimated by calculating correlations of the ring-width series of the unknown wood with reference trees of known geographic origins. We applied the dendroprovenancing method to carbon isotope network data of pinyon pines (Pinus edulis and Pinus monophylla) from the southwestern United States to test the efficacy of using a carbon isotope time series for provenancing wood. First, we calculated correlations (t values) between test trees temporarily assumed to be of unknown origin and reference trees from 13 surrounding sites. Then, we plotted the t values on a map. When provenancing was successful, the tested trees showed the strongest correlation with reference trees from sites close to the actual origins of the test trees, and the correlations decreased with the distance between the original sites of test and reference trees. This conical distribution of t values enabled provenancing of wood with precision of 114–304 km. Although isotope measurement is more expensive and laborious than ring-width measurement, our tests of provenancing pinyon pines in the southwestern United States showed a higher success rate with carbon isotopes.

Key words

Illegal logging Isotope fingerprint Traceability δ13Forest law enforcement governance and trade (FLEGT) 

Copyright information

© The Japan Wood Research Society 2009

Authors and Affiliations

  1. 1.Wood Anatomy and Quality LaboratoryForestry and Forest Products Research InstituteIbarakiJapan
  2. 2.Laboratory of Tree-Ring ResearchUniversity of ArizonaTucsonUSA

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