title: Synthesis and modeling perspectives of rhizosphere priming.
abstract: The rhizosphere priming effect (RPE) is a mechanism by which plants interact with soil functions. The large impact of the RPE on soil organic matter decomposition rates (from 50% reduction to 380% increase) warrants similar attention to that being paid to climatic controls on ecosystem functions. Furthermore, global increases in atmospheric CO2 concentration and surface temperature can significantly alter the RPE. Our analysis using a game theoretic model suggests that the RPE may have resulted from an evolutionarily stable mutualistic association between plants and rhizosphere microbes. Through model simulations based on microbial physiology, we demonstrate that a shift in microbial metabolic response to different substrate inputs from plants is a plausible mechanism leading to positive or negative RPEs. In a case study of the Duke Free-Air CO2 Enrichment experiment, performance of the PhotoCent model was significantly improved by including an RPE-induced 40% increase in soil organic matter decomposition rate for the elevated CO2 treatment--demonstrating the value of incorporating the RPE into future ecosystem models. Overall, the RPE is emerging as a crucial mechanism in terrestrial ecosystems, which awaits substantial research and model development.
authors: Environmental Studies Department, University of California, Santa Cruz, CA, 95064, USA.|State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China.
authors: Weixin
authors: W
authors: Cheng
authors: Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO, 80523, USA.
authors: William J
authors: WJ
authors: Parton
authors: Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL, 60607, USA.
authors: Miquel A
authors: MA
authors: Gonzalez-Meler
authors: Department of Biology, Indiana University, Bloomington, IN, 47405, USA.
authors: Richard
authors: R
authors: Phillips
authors: Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO, 80523, USA.
authors: Shinichi
authors: S
authors: Asao
authors: Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL, 60607, USA.
authors: Gordon G
authors: GG
authors: McNickle
authors: Department of Biology, Indiana University, Bloomington, IN, 47405, USA.
authors: Edward
authors: E
authors: Brzostek
authors: Biosciences Division, Argonne National Laboratory, Argonne, IL, 60439, USA.
authors: Julie D
authors: JD
authors: Jastrow
mesh_terms: D002244:Carbon / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism / Q000494:pharmacology; D017753:Ecosystem; D008954:Models, Biological; D010944:Plants / Q000187:drug effects / Q000378:metabolism / Q000382:microbiology*; D058441:Rhizosphere; D012987:Soil; D012988:Soil Microbiology; D013559:Symbiosis
chemical_list: D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon
keywords: PhotoCent model; decomposition; elevated CO2; plant-microbe interactions; roots; soil organic matter (SOM)
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