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Forestry Advance Access originally published online on June 9, 2005
Forestry 2005 78(4):451-455; doi:10.1093/forestry/cpi041
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© Institute of Chartered Foresters, 2005. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Research Notes

Estimating stemwood nutrient concentration with an increment borer: a potential source of error

L. Augusto1,* and D. Bert2

1 Institut National de la Recherche Agronomique, UMR TCEM. BP81, 33883 Villenave d'Ornon Cedex, France
2 Institut National de la Recherche Agronomique, UR EPHYSE. 69 rte d'Arcachon, 33612 Cestas Cedex, France

* Corresponding author. E-mail: laugusto{at}bordeaux.inra.fr

Two methods of sampling stemwood nutrients have been compared on 10 Pinus pinaster (Ait.) trees: the increment borer method (non-destructive but producing samples which are not weighed according to the tissues' proportion) and the disc method (destructive but producing weighed samples). The samples were divided into sapwood and heartwood, and nutrient concentrations were determined for major nutrients (N, P, K, Ca, Mg). Compared with the disc sampling method, the increment borer sampling method significantly underestimated N, P and K concentration in sapwood, whereas it overestimated Ca and Mg concentration in heartwood. The mean error ranged from –13 per cent (N and P in sapwood) to +14 per cent (Ca in heartwood). These results were in agreement with previous studies which showed horizontal variations in the nutrient concentration of stemwood.

Received 13 September 2004.
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L. Augusto, M. R. Bakker, C. De Lavaissiere, L. Jordan-Meille, and E. Saur
Estimation of nutrient content of woody plants using allometric relationships: quantifying the difference between concentration values from the literature and actuals
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