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Title: Digging deeper: Fine root responses to rising atmospheric [CO2] in forested ecosystems

Abstract

Experimental evidence from a diverse set of forested ecosystems indicates that CO2 enrichment may lead to deeper rooting distributions. While the causes of greater root production at deeper soil depths under elevated CO2 concentration ([CO2]) require further investigation, altered rooting distributions are expected to affect important ecosystem processes. The depth at which fine roots are produced may influence root chemistry, physiological function, and mycorrhizal infection, leading to altered nitrogen (N) uptake rates and slower turnover. Also, soil processes such as microbial decomposition are slowed at depth in the soil, potentially affecting the rate at which root detritus becomes incorporated into soil organic matter. Deeper rooting distributions under elevated [CO2] provide exciting opportunities to use novel sensors and chemical analyses throughout the soil profile to track the effects of root proliferation on carbon (C) and N cycling. Models do not currently incorporate information on root turnover and C and N cycling at depth in the soil, and modification is necessary to accurately represent processes associated with altered rooting depth distributions. Progress in understanding and modeling the interface between deeper rooting distributions under elevated [CO2] and soil C and N cycling will be critical in projecting the sustainability of forest responses tomore » rising atmospheric [CO2].« less

Authors:
ORCiD logo [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
974219
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
New Phytologist
Additional Journal Information:
Journal Volume: 186; Journal Issue: 2; Journal ID: ISSN 0028-646X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; CARBON; CHEMISTRY; DEPTH; DETRITUS; ECOSYSTEMS; FORESTS; MODIFICATIONS; NITROGEN; ORGANIC MATTER; PRODUCTION; PROLIFERATION; SIMULATION; SOILS; SPATIAL DISTRIBUTION; elevated [CO2]; forests; fine roots; depth distribution; turnover; carbon storage; nutrient cycling; ecosystem model

Citation Formats

Iversen, Colleen M. Digging deeper: Fine root responses to rising atmospheric [CO2] in forested ecosystems. United States: N. p., 2010. Web. doi:10.1111/j.1469-8137.2009.03122.x.
Iversen, Colleen M. Digging deeper: Fine root responses to rising atmospheric [CO2] in forested ecosystems. United States. doi:10.1111/j.1469-8137.2009.03122.x.
Iversen, Colleen M. Thu . "Digging deeper: Fine root responses to rising atmospheric [CO2] in forested ecosystems". United States. doi:10.1111/j.1469-8137.2009.03122.x.
@article{osti_974219,
title = {Digging deeper: Fine root responses to rising atmospheric [CO2] in forested ecosystems},
author = {Iversen, Colleen M.},
abstractNote = {Experimental evidence from a diverse set of forested ecosystems indicates that CO2 enrichment may lead to deeper rooting distributions. While the causes of greater root production at deeper soil depths under elevated CO2 concentration ([CO2]) require further investigation, altered rooting distributions are expected to affect important ecosystem processes. The depth at which fine roots are produced may influence root chemistry, physiological function, and mycorrhizal infection, leading to altered nitrogen (N) uptake rates and slower turnover. Also, soil processes such as microbial decomposition are slowed at depth in the soil, potentially affecting the rate at which root detritus becomes incorporated into soil organic matter. Deeper rooting distributions under elevated [CO2] provide exciting opportunities to use novel sensors and chemical analyses throughout the soil profile to track the effects of root proliferation on carbon (C) and N cycling. Models do not currently incorporate information on root turnover and C and N cycling at depth in the soil, and modification is necessary to accurately represent processes associated with altered rooting depth distributions. Progress in understanding and modeling the interface between deeper rooting distributions under elevated [CO2] and soil C and N cycling will be critical in projecting the sustainability of forest responses to rising atmospheric [CO2].},
doi = {10.1111/j.1469-8137.2009.03122.x},
journal = {New Phytologist},
issn = {0028-646X},
number = 2,
volume = 186,
place = {United States},
year = {2010},
month = {4}
}

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