Experimental warming in a dryland community reduced plant photosynthesis and soil CO 2 efflux although the relationship between the fluxes remained unchanged

Wertin, Timothy M.; Belnap, Jayne; Reed, Sasha C.; Power, ed., Sally

doi:10.1111/1365-2435.12708

Title: Experimental warming in a dryland community reduced plant photosynthesis and soil CO ₂ efflux although the relationship between the fluxes remained unchanged

Journal Article · Wed Sep 28 00:00:00 EDT 2016 · Functional Ecology

DOI:https://doi.org/10.1111/1365-2435.12708· OSTI ID:1401863

Wertin, Timothy M. ^[1]; Belnap, Jayne ^[1]; Reed, Sasha C. ^[1]; Power, ed., Sally

U.S. Geological Survey Southwest Biological Science Center Moab Utah 84532 USA

Summary Drylands represent our planet's largest terrestrial biome and, due to their extensive area, maintain large stocks of carbon (C). Accordingly, understanding how dryland C cycling will respond to climate change is imperative for accurately forecasting global C cycling and future climate. However, it remains difficult to predict how increased temperature will affect dryland C cycling, as substantial uncertainties surround the potential responses of the two main C fluxes: plant photosynthesis and soil CO ₂ efflux. In addition to a need for an improved understanding of climate effects on individual dryland C fluxes, there is also notable uncertainty regarding how climate change may influence the relationship between these fluxes. To address this important knowledge gap, we measured a growing season's in situ photosynthesis, plant biomass accumulation and soil CO ₂ efflux of mature Achnatherum hymenoides (a common and ecologically important C ₃ bunchgrass growing throughout western North America) exposed to ambient or elevated temperature (+2 °C above ambient, warmed via infrared lamps) for 3 years. The 2 °C increase in temperature caused a significant reduction in photosynthesis, plant growth and soil CO ₂ efflux. Of important note, photosynthesis and soil respiration appeared tightly coupled and the relationship between these fluxes was not altered by the elevated temperature treatment, suggesting C fixation's strong control of both above‐ground and below‐ground dryland C cycling. Leaf water use efficiency was substantially increased in the elevated temperature treatment compared to the control treatment. Taken together, our results suggest notable declines in photosynthesis with relatively subtle warming, reveal strong coupling between above‐ and below‐ground C fluxes in this dryland and highlight temperature's strong effect on fundamental components of dryland C and water cycles.

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Sponsoring Organization:: USDOE

OSTI ID:: 1401863

Journal Information:: Functional Ecology, Journal Name: Functional Ecology Vol. 31 Journal Issue: 2; ISSN 0269-8463

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 32 works

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