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Effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum (Liquidambar styraciflua) in North Carolina
Sweetgum, Liquidambar styraciflua L. (Hamamelidales: Hamamelidaceae), is a species of interest for short-rotation plantation forestry in the southeastern United States. Despite its high levels of resistance to many native insects and pathogens, the species is susceptible to generalist defoliators du...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Oxford University Press
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4212847/ https://www.ncbi.nlm.nih.gov/pubmed/25199618 http://dx.doi.org/10.1093/jis/14.1.107 |
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author | Jetton, Robert M. Robison, Daniel J. |
author_facet | Jetton, Robert M. Robison, Daniel J. |
author_sort | Jetton, Robert M. |
collection | PubMed |
description | Sweetgum, Liquidambar styraciflua L. (Hamamelidales: Hamamelidaceae), is a species of interest for short-rotation plantation forestry in the southeastern United States. Despite its high levels of resistance to many native insects and pathogens, the species is susceptible to generalist defoliators during outbreak epidemics. The objective of this field study was to evaluate the potential impact of defoliation on sweetgum growth and productivity within the context of an operational plantation. Over three growing seasons, trees were subjected to artificial defoliation treatments of various intensity (control = 0% defoliation; low intensity = 33% defoliation; moderate intensity = 67% defoliation; high intensity = 99% defoliation) and frequency (not defoliated; defoliated once in April of the first growing season; defoliated twice, once in April of the first growing season and again in April of the second growing season). The responses of stem height, stem diameter, stem volume, crown volume, total biomass accumulation, and branch growth were measured in November of each growing season. At the end of the first growing season, when trees had received single defoliations, significant reductions in all growth traits followed the most severe (99%) defoliation treatment only. After the second and third growing seasons, when trees had received one or two defoliations of varying intensity, stem diameter and volume and total tree biomass were reduced significantly by 67 and 99% defoliation, while reductions in stem height and crown volume followed the 99% treatment only. All growth traits other than crown volume were reduced significantly by two defoliations but not one defoliation. Results indicate that sweetgum is highly resilient to single defoliations of low, moderate, and high intensity. However, during the three-year period of the study, repeated high-intensity defoliation caused significant reductions in growth and productivity that could have lasting impacts on yield throughout a harvest rotation. |
format | Online Article Text |
id | pubmed-4212847 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-42128472014-10-31 Effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum (Liquidambar styraciflua) in North Carolina Jetton, Robert M. Robison, Daniel J. J Insect Sci Papers Sweetgum, Liquidambar styraciflua L. (Hamamelidales: Hamamelidaceae), is a species of interest for short-rotation plantation forestry in the southeastern United States. Despite its high levels of resistance to many native insects and pathogens, the species is susceptible to generalist defoliators during outbreak epidemics. The objective of this field study was to evaluate the potential impact of defoliation on sweetgum growth and productivity within the context of an operational plantation. Over three growing seasons, trees were subjected to artificial defoliation treatments of various intensity (control = 0% defoliation; low intensity = 33% defoliation; moderate intensity = 67% defoliation; high intensity = 99% defoliation) and frequency (not defoliated; defoliated once in April of the first growing season; defoliated twice, once in April of the first growing season and again in April of the second growing season). The responses of stem height, stem diameter, stem volume, crown volume, total biomass accumulation, and branch growth were measured in November of each growing season. At the end of the first growing season, when trees had received single defoliations, significant reductions in all growth traits followed the most severe (99%) defoliation treatment only. After the second and third growing seasons, when trees had received one or two defoliations of varying intensity, stem diameter and volume and total tree biomass were reduced significantly by 67 and 99% defoliation, while reductions in stem height and crown volume followed the 99% treatment only. All growth traits other than crown volume were reduced significantly by two defoliations but not one defoliation. Results indicate that sweetgum is highly resilient to single defoliations of low, moderate, and high intensity. However, during the three-year period of the study, repeated high-intensity defoliation caused significant reductions in growth and productivity that could have lasting impacts on yield throughout a harvest rotation. Oxford University Press 2014-08-12 /pmc/articles/PMC4212847/ /pubmed/25199618 http://dx.doi.org/10.1093/jis/14.1.107 Text en This is an open access paper. We use the Creative Commons Attribution 3.0 license that permits unrestricted use, provided that the paper is properly attributed. http://creativecommons.org/licenses/by/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, providedthe original work is properly cited. |
spellingShingle | Papers Jetton, Robert M. Robison, Daniel J. Effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum (Liquidambar styraciflua) in North Carolina |
title |
Effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum
(Liquidambar styraciflua)
in North Carolina
|
title_full |
Effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum
(Liquidambar styraciflua)
in North Carolina
|
title_fullStr |
Effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum
(Liquidambar styraciflua)
in North Carolina
|
title_full_unstemmed |
Effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum
(Liquidambar styraciflua)
in North Carolina
|
title_short |
Effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum
(Liquidambar styraciflua)
in North Carolina
|
title_sort | effects of artificial defoliation on growth and biomass accumulation in short-rotation sweetgum
(liquidambar styraciflua)
in north carolina |
topic | Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4212847/ https://www.ncbi.nlm.nih.gov/pubmed/25199618 http://dx.doi.org/10.1093/jis/14.1.107 |
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