Shifts in biomass and nitrogen allocation to tree seedlings in response to root-zone temperature

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Abstract

Root-zone warming of trees can result in an increase in biomass production but the mechanisms for this increase may differ between evergreen and deciduous species. The leaf gas exchange, carbohydrate and nitrogen partitioning of two Australian evergreens, Acacia saligna and Eucalyptus cladocalyx, were compared to the deciduous Populus deltoides and Acer negundo after exposure to cool or warm soil during spring. The warm treatment stimulated aboveground biomass production in all four species, however the form of this increase was species dependent. Compared with the evergreens, soluble sugars were mobilised from the above- and belowground components to a greater extent in the deciduous species, especially during root-zone warming. Photosynthesis, stomatal conductance and transpiration were increased in the warm soil treatment for the two evergreens and P. deltoides only. In P. deltoides and A. saligna the new fine roots contained greater starch concentrations when grown in warm soil but only in A. negundo was new root growth greater. Compared with the other three species, the leguminous A. saligna contained the highest N and most of this was concentrated in the phyllodes of warmed plants with no apparent mobilisation from the existing biomass. In the other evergreen, E. cladocalyx, the existing leaves and stems were a N source for new growth, while in the two deciduous species N was derived from the woody components and structural roots. These data show that the carbohydrate movement and nitrogen partitioning patterns in response to soil warming differ between perennial and deciduous plants and are likely responsible for the different forms of biomass accumulation in each of these species.
Original languageEnglish
Pages (from-to)205-216
Number of pages12
JournalAustralian Journal of Botany
Volume62
Issue number3
DOIs
Publication statusPublished - 2014

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Acacia saligna
root zone temperature
Populus deltoides
Acer negundo
rhizosphere
biomass production
seedling
seedlings
nitrogen
biomass
carbohydrates
soil heating
temperature
warming
soil treatment
aboveground biomass
gas exchange
stomatal conductance
leaves
soil

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@article{9bf425a2dce648098a465d5b32914e84,
title = "Shifts in biomass and nitrogen allocation to tree seedlings in response to root-zone temperature",
abstract = "Root-zone warming of trees can result in an increase in biomass production but the mechanisms for this increase may differ between evergreen and deciduous species. The leaf gas exchange, carbohydrate and nitrogen partitioning of two Australian evergreens, Acacia saligna and Eucalyptus cladocalyx, were compared to the deciduous Populus deltoides and Acer negundo after exposure to cool or warm soil during spring. The warm treatment stimulated aboveground biomass production in all four species, however the form of this increase was species dependent. Compared with the evergreens, soluble sugars were mobilised from the above- and belowground components to a greater extent in the deciduous species, especially during root-zone warming. Photosynthesis, stomatal conductance and transpiration were increased in the warm soil treatment for the two evergreens and P. deltoides only. In P. deltoides and A. saligna the new fine roots contained greater starch concentrations when grown in warm soil but only in A. negundo was new root growth greater. Compared with the other three species, the leguminous A. saligna contained the highest N and most of this was concentrated in the phyllodes of warmed plants with no apparent mobilisation from the existing biomass. In the other evergreen, E. cladocalyx, the existing leaves and stems were a N source for new growth, while in the two deciduous species N was derived from the woody components and structural roots. These data show that the carbohydrate movement and nitrogen partitioning patterns in response to soil warming differ between perennial and deciduous plants and are likely responsible for the different forms of biomass accumulation in each of these species.",
keywords = "Biomass partitioning, Box elder, Cottonwood, Soil temperature, Sugar gum, Wattle",
author = "Suzy Rogiers and Jason Smith and Bruno Holzapfel and Gurli Nielsen",
note = "Includes bibliographical references.",
year = "2014",
doi = "10.1071/BT14071",
language = "English",
volume = "62",
pages = "205--216",
journal = "Australian Journal of Botany",
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TY - JOUR

T1 - Shifts in biomass and nitrogen allocation to tree seedlings in response to root-zone temperature

AU - Rogiers, Suzy

AU - Smith, Jason

AU - Holzapfel, Bruno

AU - Nielsen, Gurli

N1 - Includes bibliographical references.

PY - 2014

Y1 - 2014

N2 - Root-zone warming of trees can result in an increase in biomass production but the mechanisms for this increase may differ between evergreen and deciduous species. The leaf gas exchange, carbohydrate and nitrogen partitioning of two Australian evergreens, Acacia saligna and Eucalyptus cladocalyx, were compared to the deciduous Populus deltoides and Acer negundo after exposure to cool or warm soil during spring. The warm treatment stimulated aboveground biomass production in all four species, however the form of this increase was species dependent. Compared with the evergreens, soluble sugars were mobilised from the above- and belowground components to a greater extent in the deciduous species, especially during root-zone warming. Photosynthesis, stomatal conductance and transpiration were increased in the warm soil treatment for the two evergreens and P. deltoides only. In P. deltoides and A. saligna the new fine roots contained greater starch concentrations when grown in warm soil but only in A. negundo was new root growth greater. Compared with the other three species, the leguminous A. saligna contained the highest N and most of this was concentrated in the phyllodes of warmed plants with no apparent mobilisation from the existing biomass. In the other evergreen, E. cladocalyx, the existing leaves and stems were a N source for new growth, while in the two deciduous species N was derived from the woody components and structural roots. These data show that the carbohydrate movement and nitrogen partitioning patterns in response to soil warming differ between perennial and deciduous plants and are likely responsible for the different forms of biomass accumulation in each of these species.

AB - Root-zone warming of trees can result in an increase in biomass production but the mechanisms for this increase may differ between evergreen and deciduous species. The leaf gas exchange, carbohydrate and nitrogen partitioning of two Australian evergreens, Acacia saligna and Eucalyptus cladocalyx, were compared to the deciduous Populus deltoides and Acer negundo after exposure to cool or warm soil during spring. The warm treatment stimulated aboveground biomass production in all four species, however the form of this increase was species dependent. Compared with the evergreens, soluble sugars were mobilised from the above- and belowground components to a greater extent in the deciduous species, especially during root-zone warming. Photosynthesis, stomatal conductance and transpiration were increased in the warm soil treatment for the two evergreens and P. deltoides only. In P. deltoides and A. saligna the new fine roots contained greater starch concentrations when grown in warm soil but only in A. negundo was new root growth greater. Compared with the other three species, the leguminous A. saligna contained the highest N and most of this was concentrated in the phyllodes of warmed plants with no apparent mobilisation from the existing biomass. In the other evergreen, E. cladocalyx, the existing leaves and stems were a N source for new growth, while in the two deciduous species N was derived from the woody components and structural roots. These data show that the carbohydrate movement and nitrogen partitioning patterns in response to soil warming differ between perennial and deciduous plants and are likely responsible for the different forms of biomass accumulation in each of these species.

KW - Biomass partitioning

KW - Box elder

KW - Cottonwood

KW - Soil temperature

KW - Sugar gum

KW - Wattle

U2 - 10.1071/BT14071

DO - 10.1071/BT14071

M3 - Article

VL - 62

SP - 205

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JO - Australian Journal of Botany

JF - Australian Journal of Botany

SN - 0067-1924

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ER -