Juvenile/Mature Wood Transition in Loblolly Pine as Defined by Annual Ring Specific Gravity, Proportion of Latewood, and Microfibril Angle
The length of juvenility or number of years a tree produces juvenile wood at a fixed height can be defined by the age of the wood at which properties change from juvenile to mature wood. This paper estimates the age of transition from juvenile to mature wood based on ring specific gravity (SG), prop...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
SWST
2007
|
Subjects: | |
Online Access: | http://wfs.swst.org/index.php/wfs/article/view/495 |
id |
ftjwfs:oai:ojs.wfs.swst.org:article/495 |
---|---|
record_format |
openpolar |
spelling |
ftjwfs:oai:ojs.wfs.swst.org:article/495 2023-05-15T17:32:04+02:00 Juvenile/Mature Wood Transition in Loblolly Pine as Defined by Annual Ring Specific Gravity, Proportion of Latewood, and Microfibril Angle Clark, Alexander Daniels, Richard F. Jordan, Lewis 2007-06-05 application/pdf http://wfs.swst.org/index.php/wfs/article/view/495 eng eng SWST http://wfs.swst.org/index.php/wfs/article/view/495/495 http://wfs.swst.org/index.php/wfs/article/view/495 Copyright (c) 2014 Wood and Fibre Science Wood and Fiber Science; Number 2 / April 2006; 292-299 0735-6161 Juvenile/mature transition Pinus taeda L specific gravity percent latewood MFA info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2007 ftjwfs 2023-02-11T17:29:40Z The length of juvenility or number of years a tree produces juvenile wood at a fixed height can be defined by the age of the wood at which properties change from juvenile to mature wood. This paper estimates the age of transition from juvenile to mature wood based on ring specific gravity (SG), proportion of annual ring in latewood, and ring average microfibril angle (MFA). The threshold method and the segmented modeling approach were used to estimate the age of transition. Twenty loblolly pine (Pinus taeda L.) plantations, 20-27 years old, were sampled across five physiographic regions in the southern United States. Increment cores were collected at 1.3 meters from 15 trees in each stand to determine ring specific gravity and proportion of latewood by X-ray densitometry and annual ring MFA by X-ray diffraction. Precisely determining the transition age between juvenile and mature wood was difficult because transition is gradual, not abrupt. The age of transition was found to differ by wood property because these properties mature at different rates due to genetic and environmental factors. Both the threshold and the segmented model approach showed that transition age varied among regions. Both approaches showed that length of juvenility based on ring SG was shorter in the South Atlantic and North Atlantic Coastal Plains (ranging from 5.5 to 7.9 years) compared to that in the Hilly Coastal Plain that ranged from 10.4 to 13.6 years. Using MFA to estimate the age of demarcation, both approaches showed the South Atlantic, Gulf Coastal, and Hilly Coastal Plains had shorter lengths of juvenility (ranging from 8.4 to 10.4 years) than the Piedmont and North Atlantic Coastal Plain (ranging from 10.5 to over 20 years). Article in Journal/Newspaper North Atlantic Wood and Fiber Science (E-Journal) |
institution |
Open Polar |
collection |
Wood and Fiber Science (E-Journal) |
op_collection_id |
ftjwfs |
language |
English |
topic |
Juvenile/mature transition Pinus taeda L specific gravity percent latewood MFA |
spellingShingle |
Juvenile/mature transition Pinus taeda L specific gravity percent latewood MFA Clark, Alexander Daniels, Richard F. Jordan, Lewis Juvenile/Mature Wood Transition in Loblolly Pine as Defined by Annual Ring Specific Gravity, Proportion of Latewood, and Microfibril Angle |
topic_facet |
Juvenile/mature transition Pinus taeda L specific gravity percent latewood MFA |
description |
The length of juvenility or number of years a tree produces juvenile wood at a fixed height can be defined by the age of the wood at which properties change from juvenile to mature wood. This paper estimates the age of transition from juvenile to mature wood based on ring specific gravity (SG), proportion of annual ring in latewood, and ring average microfibril angle (MFA). The threshold method and the segmented modeling approach were used to estimate the age of transition. Twenty loblolly pine (Pinus taeda L.) plantations, 20-27 years old, were sampled across five physiographic regions in the southern United States. Increment cores were collected at 1.3 meters from 15 trees in each stand to determine ring specific gravity and proportion of latewood by X-ray densitometry and annual ring MFA by X-ray diffraction. Precisely determining the transition age between juvenile and mature wood was difficult because transition is gradual, not abrupt. The age of transition was found to differ by wood property because these properties mature at different rates due to genetic and environmental factors. Both the threshold and the segmented model approach showed that transition age varied among regions. Both approaches showed that length of juvenility based on ring SG was shorter in the South Atlantic and North Atlantic Coastal Plains (ranging from 5.5 to 7.9 years) compared to that in the Hilly Coastal Plain that ranged from 10.4 to 13.6 years. Using MFA to estimate the age of demarcation, both approaches showed the South Atlantic, Gulf Coastal, and Hilly Coastal Plains had shorter lengths of juvenility (ranging from 8.4 to 10.4 years) than the Piedmont and North Atlantic Coastal Plain (ranging from 10.5 to over 20 years). |
format |
Article in Journal/Newspaper |
author |
Clark, Alexander Daniels, Richard F. Jordan, Lewis |
author_facet |
Clark, Alexander Daniels, Richard F. Jordan, Lewis |
author_sort |
Clark, Alexander |
title |
Juvenile/Mature Wood Transition in Loblolly Pine as Defined by Annual Ring Specific Gravity, Proportion of Latewood, and Microfibril Angle |
title_short |
Juvenile/Mature Wood Transition in Loblolly Pine as Defined by Annual Ring Specific Gravity, Proportion of Latewood, and Microfibril Angle |
title_full |
Juvenile/Mature Wood Transition in Loblolly Pine as Defined by Annual Ring Specific Gravity, Proportion of Latewood, and Microfibril Angle |
title_fullStr |
Juvenile/Mature Wood Transition in Loblolly Pine as Defined by Annual Ring Specific Gravity, Proportion of Latewood, and Microfibril Angle |
title_full_unstemmed |
Juvenile/Mature Wood Transition in Loblolly Pine as Defined by Annual Ring Specific Gravity, Proportion of Latewood, and Microfibril Angle |
title_sort |
juvenile/mature wood transition in loblolly pine as defined by annual ring specific gravity, proportion of latewood, and microfibril angle |
publisher |
SWST |
publishDate |
2007 |
url |
http://wfs.swst.org/index.php/wfs/article/view/495 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Wood and Fiber Science; Number 2 / April 2006; 292-299 0735-6161 |
op_relation |
http://wfs.swst.org/index.php/wfs/article/view/495/495 http://wfs.swst.org/index.php/wfs/article/view/495 |
op_rights |
Copyright (c) 2014 Wood and Fibre Science |
_version_ |
1766129996150079488 |