Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/16532
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Ecosystem-level controls on root-rhizosphere respiration
Authors: Hopkins, Francesca
Gonzalez-Meler, Miquel A
Flower, Charles E
Lynch, Douglas J
Czimczik, Claudia
Tang, Jianwu
Subke, Jens-Arne
Contact Email: jens-arne.subke@stir.ac.uk
Keywords: autotrophic
global change
gross primary productivity (GPP)
heterotrophic
nitrogen (N)
rhizosphere
root respiration
soil respiration
Issue Date: Jul-2013
Publisher: Wiley-Blackwell
Citation: Hopkins F, Gonzalez-Meler MA, Flower CE, Lynch DJ, Czimczik C, Tang J & Subke J (2013) Ecosystem-level controls on root-rhizosphere respiration, New Phytologist, 199 (2), pp. 339-351.
Abstract: Recent advances in the partitioning of autotrophic from heterotrophic respiration processes in soils in conjunction with new high temporal resolution soil respiration data sets offer insights into biotic and environmental controls of respiration. Besides temperature, many emerging controlling factors have not yet been incorporated into ecosystem-scale models. We synthesize recent research that has partitioned soil respiration into its process components to evaluate effects of nitrogen, temperature and photosynthesis on autotrophic flux from soils at the ecosystem level. Despite the widely used temperature dependence of root respiration, gross primary productivity (GPP) can explain most patterns of ecosystem root respiration (and to some extent heterotrophic respiration) at within-season time-scales. Specifically, heterotrophic respiration is influenced by a seasonally variable supply of recent photosynthetic products in the rhizosphere. The contribution of stored root carbon (C) to root respiratory fluxes also varied seasonally, partially decoupling the proportion of photosynthetic C driving root respiration. In order to reflect recent insights, new hierarchical models, which incorporate root respiration as a primary function of GPP and which respond to environmental variables by modifying C allocation belowground, are needed for better prediction of future ecosystem C sequestration.
Type: Journal Article
URI: http://hdl.handle.net/1893/16532
DOI Link: http://dx.doi.org/10.1111/nph.12271
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: University of California, Irvine
University of Illinois at Chicago
University of Illinois at Chicago
University of Illinois at Chicago
University of California, Irvine
Marine Biological Laboratory
Biological and Environmental Sciences

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