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Tytuł:
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Plant, microbial and ecosystem carbon use efficiencies interact to stabilize microbial growth as a fraction of gross primary production.
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Autorzy:
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Sinsabaugh RL; Biology Department, University of New Mexico, Albuquerque, NM, 87131, USA.
Moorhead DL; Department of Environmental Sciences, University of Toledo, Toledo, OH, 43606, USA.
Xu X; Biology Department, San Diego State University, San Diego, CA, 92182, USA.
Litvak ME; Biology Department, University of New Mexico, Albuquerque, NM, 87131, USA.
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Źródło:
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The New phytologist [New Phytol] 2017 Jun; Vol. 214 (4), pp. 1518-1526. Date of Electronic Publication: 2017 Feb 24.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: Oxford : Wiley on behalf of New Phytologist Trust
Original Publication: London, New York [etc.] Academic Press.
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MeSH Terms:
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Soil Microbiology*
Carbon/*metabolism
Plants/*metabolism
Biomass ; Carbon Sequestration ; Ecosystem ; Satellite Imagery ; Soil/chemistry ; Temperature
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Contributed Indexing:
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Keywords: ecosystem carbon use efficiency; metabolic theory; microbial carbon use efficiency (CUEh); plant carbon use efficiency (CUEa); soil carbon storage; temperature sensitivity
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Substance Nomenclature:
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0 (Soil)
7440-44-0 (Carbon)
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Entry Date(s):
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Date Created: 20170225 Date Completed: 20180222 Latest Revision: 20200930
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Update Code:
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20240105
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DOI:
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10.1111/nph.14485
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PMID:
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28233327
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The carbon use efficiency of plants (CUE a ) and microorganisms (CUE h ) determines rates of biomass turnover and soil carbon sequestration. We evaluated the hypothesis that CUE a and CUE h counterbalance at a large scale, stabilizing microbial growth (μ) as a fraction of gross primary production (GPP). Collating data from published studies, we correlated annual CUE a , estimated from satellite imagery, with locally determined soil CUE h for 100 globally distributed sites. Ecosystem CUE e , the ratio of net ecosystem production (NEP) to GPP, was estimated for each site using published models. At the ecosystem scale, CUE a and CUE h were inversely related. At the global scale, the apparent temperature sensitivity of CUE h with respect to mean annual temperature (MAT) was similar for organic and mineral soils (0.029°C -1 ). CUE a and CUE e were inversely related to MAT, with apparent sensitivities of -0.009 and -0.032°C -1 , respectively. These trends constrain the ratio μ : GPP (= (CUE a × CUE h )/(1 - CUE e )) with respect to MAT by counterbalancing the apparent temperature sensitivities of the component processes. At the ecosystem scale, the counterbalance is effected by modulating soil organic matter stocks. The results suggest that a μ : GPP value of c. 0.13 is a homeostatic steady state for ecosystem carbon fluxes at a large scale.
(© 2017 The Authors. New Phytologist © 2017 New Phytologist Trust.)
