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Adjustment of forest ecosystem root respiration as temperature warms

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dc.contributor.author Burton, Andrew J.
dc.contributor.author Melillo, Jerry M.
dc.contributor.author Frey, Serita D.
dc.date.accessioned 2009-10-21T18:16:33Z
dc.date.available 2009-10-21T18:16:33Z
dc.date.issued 2008-06
dc.identifier.uri http://hdl.handle.net/1912/3031
dc.description Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Journal of Integrative Plant Biology 50 (2008): 1467-1483, doi:10.1111/j.1744-7909.2008.00750.x. en_US
dc.description.abstract Adjustment of ecosystem root respiration to warmer climatic conditions can alter the autotrophic portion of soil respiration and influence the amount of carbon available for biomass production. We examined 44 published values of annual forest root respiration and found an increase in ecosystem root respiration with increasing mean annual temperature (MAT), but the rate of this cross-ecosystem increase (Q10 = 1.6) is less than published values for short-term responses of root respiration to temperature within ecosystems (Q10 = 2 to 3). When specific root respiration rates and root biomass values were examined, there was a clear trend for decreasing root metabolic capacity (respiration rate at a standard temperature) with increasing MAT. There also were tradeoffs between root metabolic capacity and root system biomass, such that there were no instances of high growing season respiration rates and high root biomass occurring together. We also examined specific root respiration rates at three soil warming experiments at Harvard Forest, USA, and found decreases in metabolic capacity for roots from the heated plots. This decline could be due to either physiological acclimation or to the effects of co-occurring drier soils on the measurement date. Regardless of the cause, these findings clearly suggest that modeling efforts that allow root respiration to increase exponentially with temperature, with Q10 values of 2 or more, may over-predict root contributions to ecosystem CO2 efflux for future climates and underestimate the amount of C available for other uses, including NPP. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.relation.uri http://dx.doi.org/10.1111/j.1744-7909.2008.00750.x
dc.subject Root respiration en_US
dc.subject Acclimation en_US
dc.subject Root biomass en_US
dc.subject Climatic warming en_US
dc.subject Soil warming en_US
dc.title Adjustment of forest ecosystem root respiration as temperature warms en_US
dc.type Preprint en_US


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