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Whole-tree tracheid property maps for loblolly pine at different ages
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Journal Article
Whole-tree tracheid property maps for loblolly pine at different ages
2020
Overview
Maps developed using Akima’s interpolation method, and representing average data for trees aged 13 and 22 years, were used to compare patterns of within-tree variation for
Pinus taeda
L. (loblolly pine) tracheid properties: coarseness (
C
), specific surface (
S
), radial (
R
) and tangential (
T
) diameter and wall thickness (
w
). SilviScan-calibrated near-infrared (NIR) spectroscopy provided data for the analysis with
C
(
R
c
2
= 0.85,
R
p
2
= 0.85),
S
(
R
c
2
= 0.83,
R
p
2
= 0.76), and
w
(
R
c
2
= 0.89,
R
p
2
= 0.93) models having very good calibration / prediction statistics, while those for
T
and
R
diameter were moderate (
R
c
2
= 0.79,
R
p
2
= 0.57) and poor (
R
c
2
= 0.64,
R
p
2
= 0.19), respectively.
C
,
S
, and
w
maps were similar to the density maps for
P. taeda
and indicate the properties increase radially at all heights. The
T
diameter map was similar to maps reported for microfibril angle except that
T
diameter increased radially and with height whereas microfibril angle decreased radially and with height. The map for
R
diameter increased with height and was unlike the other properties examined; caution is recommended regarding any interpretations based on the
R
diameter map owing to the weak statistics observed for the NIR model. Changes observed between the two ages are consistent with the asymptotic progression of properties associated with maturation.
