e-journal

High-resolution proxies for wood density variations in Terminalia superba

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Background and Aims Density is a crucial variable in forest and wood science and is evaluated by a multitude of methods. Direct gravimetric methods are mostly destructive and time-consuming. Therefore, faster and semito non-destructive indirect methods have been developed.
Methods Profiles of wood density variations with a resolution of approx. 50 mm were derived from one-dimensional resistance drillings, two-dimensional neutron scans, and three-dimensional neutron and X-ray scans. All methods were applied on Terminalia superba Engl. & Diels, an African pioneer species which sometimes exhibits a brown heart (limba noir).
Key Results The use of X-ray tomography combined with a reference material permitted direct estimates of
wood density. These X-ray-derived densities overestimated gravimetrically determined densities non-significantly and showed high correlation (linear regression, R2 ¼ 0.995). When comparing X-ray densities with the attenuation coefficients of neutron scans and the amplitude of drilling resistance, a significant linear relation was found with the neutron attenuation coefficient (R2 ¼ 0.986) yet a weak relation with drilling resistance (R2 ¼ 0.243). When density patterns are compared, all three methods are capable of revealing the same trends. Differences are mainly due to the orientation of tree rings and the different characteristics of the indirect methods.
Conclusions High-resolution X-ray computed tomography is a promising technique for research on wood cores
and will be explored further on other temperate and tropical species. Further study on limba noir is necessary to reveal the causes of density variations and to determine how resistance drillings can be further refined.
Key words: High-resolution X-ray tomography, neutron imaging, drilling resistance, Terminalia superba, wood density.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

: Oxford University Press on behalf of the Annals of Botany Company., 2011

Deskripsi Fisik

Annals of Botany 107: 293–302, 2011

Bahasa

English

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

PERTANIAN.

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Pernyataan Tanggungjawab

yuli/agus

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