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Below-ground process responses to elevated CO2 and temperature: a discussion of observations, measurement methods, and models

Pendall, E; Bridgham, S; Hanson, PJ; Hungate, B; Kicklighter, DW; Johnson, DW; Law, BE; Luo, YQ; Megonigal, JP and Olsrud, Maria LU , et al. (2004) In New Phytologist 162(2). p.311-322
Abstract
Rising atmospheric CO2 and temperatures are probably altering ecosystem carbon cycling, causing both positive and negative feedbacks to climate. Below-ground processes play a key role in the global carbon (C) cycle because they regulate storage of large quantities of C, and are potentially very sensitive to direct and indirect effects of elevated CO2 and temperature. Soil organic matter pools, roots and associated rhizosphere organisms all have distinct responses to environmental change drivers, although availability of C substrates will regulate all the responses. Elevated CO2 increases C supply below-ground, whereas warming is likely to increase respiration and decomposition rates, leading to speculation that these effects will moderate... (More)
Rising atmospheric CO2 and temperatures are probably altering ecosystem carbon cycling, causing both positive and negative feedbacks to climate. Below-ground processes play a key role in the global carbon (C) cycle because they regulate storage of large quantities of C, and are potentially very sensitive to direct and indirect effects of elevated CO2 and temperature. Soil organic matter pools, roots and associated rhizosphere organisms all have distinct responses to environmental change drivers, although availability of C substrates will regulate all the responses. Elevated CO2 increases C supply below-ground, whereas warming is likely to increase respiration and decomposition rates, leading to speculation that these effects will moderate one another. However, indirect effects on soil moisture availability and nutrient supply may alter processes in unexpected directions. Detailed, mechanistic understanding and modelling of below-ground flux components, pool sizes and turnover rates is needed to adequately predict long-term, net C storage in ecosystems. In this synthesis, we discuss the current status of below-ground responses to elevated CO2 and temperature and potential feedback effects, methodological challenges, and approaches to integrating models and measurements. (Less)
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Contribution to journal
publication status
published
subject
keywords
rhizosphere, nutrient cycling, mycorrhizas, carbon sequestration, CO2 fertilization, soil carbon, soil respiration, soil warming
in
New Phytologist
volume
162
issue
2
pages
311 - 322
publisher
Wiley-Blackwell
external identifiers
  • wos:000221058900006
  • scopus:11144353702
ISSN
1469-8137
DOI
10.1111/j.1469-8137.2004.01053.x
language
English
LU publication?
yes
id
13439135-c081-4b5e-9390-1040c4febe5d (old id 280383)
date added to LUP
2007-10-29 14:53:49
date last changed
2017-10-22 03:44:00
@article{13439135-c081-4b5e-9390-1040c4febe5d,
  abstract     = {Rising atmospheric CO2 and temperatures are probably altering ecosystem carbon cycling, causing both positive and negative feedbacks to climate. Below-ground processes play a key role in the global carbon (C) cycle because they regulate storage of large quantities of C, and are potentially very sensitive to direct and indirect effects of elevated CO2 and temperature. Soil organic matter pools, roots and associated rhizosphere organisms all have distinct responses to environmental change drivers, although availability of C substrates will regulate all the responses. Elevated CO2 increases C supply below-ground, whereas warming is likely to increase respiration and decomposition rates, leading to speculation that these effects will moderate one another. However, indirect effects on soil moisture availability and nutrient supply may alter processes in unexpected directions. Detailed, mechanistic understanding and modelling of below-ground flux components, pool sizes and turnover rates is needed to adequately predict long-term, net C storage in ecosystems. In this synthesis, we discuss the current status of below-ground responses to elevated CO2 and temperature and potential feedback effects, methodological challenges, and approaches to integrating models and measurements.},
  author       = {Pendall, E and Bridgham, S and Hanson, PJ and Hungate, B and Kicklighter, DW and Johnson, DW and Law, BE and Luo, YQ and Megonigal, JP and Olsrud, Maria and Ryan, MG and Wan, SQ},
  issn         = {1469-8137},
  keyword      = {rhizosphere,nutrient cycling,mycorrhizas,carbon sequestration,CO2 fertilization,soil carbon,soil respiration,soil warming},
  language     = {eng},
  number       = {2},
  pages        = {311--322},
  publisher    = {Wiley-Blackwell},
  series       = {New Phytologist},
  title        = {Below-ground process responses to elevated CO2 and temperature: a discussion of observations, measurement methods, and models},
  url          = {http://dx.doi.org/10.1111/j.1469-8137.2004.01053.x},
  volume       = {162},
  year         = {2004},
}