Plant species, not climate, controls aboveground biomass O2:CO2 exchange ratios in deciduous and coniferous ecosystems

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dc.citation.firstpage2314
dc.citation.issueNumber9
dc.citation.journalTitleJournal of Geophysical Research: Biogeosciences
dc.citation.lastpage2324
dc.citation.volumeNumber122
dc.contributor.authorGallagher, Morgan E.
dc.contributor.authorLiljestrand, Frasier L.
dc.contributor.authorHockaday, William C.
dc.contributor.authorMasiello, Caroline A.
dc.date.accessioned2018-06-29T16:54:54Z
dc.date.available2018-06-29T16:54:54Z
dc.date.issued2017
dc.description.abstractThe oxidative ratio (OR) is the O2:CO2 ratio associated with photosynthesis, respiration, and other ecosystem gas exchange processes and can be reported on the scale of an individual leaf, an ecosystem, up to the entire terrestrial biosphere. The OR of the terrestrial biosphere is used to partition anthropogenic CO2 between oceanic and terrestrial carbon sinks, and the ease of measurement of this property on smaller scales suggests its potential for other uses. However, controls on the natural variation of OR are not understood in either organic matter pools or fluxes, and this lack of basic information limits the use of the tracer. Here we assess the annual variability of the OR of photosynthesis over ~decade for two temperate forests, one coniferous and one deciduous, and show that the photosynthetic OR signature is strongly dominated by plant species. We determined the OR of this flux by measuring the OR of carbon pools that close on annual or shorter timescales (leaves and individual tree rings), via solidā€state 13C NMR spectroscopy and elemental analysis. Leaf litter OR is different between coniferous and deciduous forests, but tree bole OR is constant between species. There was no significant change in leaf litter OR with time, nor any correlations between leaf litter OR and temperature or precipitation. During this time growing season precipitation varied by 95% from the time period average, and growing season temperature by 22%, demonstrating that on the decadal scale photosynthetic OR is invariant over significant shifts in these climate parameters.
dc.identifier.citationGallagher, Morgan E., Liljestrand, Frasier L., Hockaday, William C., et al.. "Plant species, not climate, controls aboveground biomass O2:CO2 exchange ratios in deciduous and coniferous ecosystems." <i>Journal of Geophysical Research: Biogeosciences,</i> 122, no. 9 (2017) Wiley: 2314-2324. https://doi.org/10.1002/2017JG003847.
dc.identifier.doihttps://doi.org/10.1002/2017JG003847
dc.identifier.urihttps://hdl.handle.net/1911/102319
dc.language.isoeng
dc.publisherWiley
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titlePlant species, not climate, controls aboveground biomass O2:CO2 exchange ratios in deciduous and coniferous ecosystems
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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