Skip to Main Content
Below-ground process responses to elevated CO2 and temperature: a discussion of observations, measurement methods, and modelsAuthor(s): Elise Pendall; Scott Bridgham; Paul J. Hanson; Bruce Hungate; David W. Kicklighter; Dale W. Johnson; Beverly E. Law; Yiqi Luo; J. Patrick Megonigal; Maria Olsrud; Michael G. Ryan; Shiqiang Wan
Source: New Phytologist. Vol. 162, no. 2 (May 2004). p. 311-322.
Publication Series: Miscellaneous Publication
PDF: Download Publication (300 B)
DescriptionRising 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 CO2 fertilization, mycorrhizas, nutrient cycling, rhizosphere, soil carbon, soil respiration, soil warming.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationPendall, Elise; Bridgham, Scott; Hanson, Paul J.; Hungate, Bruce; Kicklighter, David W.; Johnson, Dale W.; Law, Beverly E.; Luo, Yiqi; Megonigal, J. Patrick; Olsrud, Maria; Ryan, Michael G.; Wan, Shiqiang. 2004. Below-ground process responses to elevated CO2 and temperature: a discussion of observations, measurement methods, and models. New Phytologist. Vol. 162, no. 2 (May 2004). p. 311-322.
Keywordscarbon sequestration, CO2 fertilization, mycorrhizas, nutrient cycling, rhizosphere, soil carbon, soil respiration, soil warming
- The response of heterotrophic activity and carbon cycling to nitrogen additions and warming in two tropical soils
- Warming-related increases in soil CO2 efflux are explained by increased below-ground carbon flux
- Tropical forest carbon balance in a warmer world: a critical review spanning microbial- to ecosystem-scale processes
XML: View XML