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Elevated CO2 does not affect stem CO2 efflux nor stem respiration in a dry Eucalyptus woodland, but it shifts the vertical gradient in xylem [CO2]

(2019) PLANT CELL AND ENVIRONMENT. 42(7). p.2151-2164
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Abstract
To quantify stem respiration (R-S) under elevated CO2 (eCO(2)), stem CO2 efflux (E-A) and CO2 flux through the xylem (F-T) should be accounted for, because part of respired CO2 is transported upwards with the sap solution. However, previous studies have used E-A as a proxy of R-S, which could lead to equivocal conclusions. Here, to test the effect of eCO(2) on R-S, both E-A and F-T were measured in a free-air CO2 enrichment experiment located in a mature Eucalyptus native forest. Drought stress substantially reduced E-A and R-S, which were unaffected by eCO(2), likely as a consequence of its neutral effect on stem growth in this phosphorus-limited site. However, xylem CO2 concentration measured near the stem base was higher under eCO(2), and decreased along the stem resulting in a negative contribution of F-T to R-S, whereas the contribution of F-T to R-S under ambient CO2 was positive. Negative F-T indicates net efflux of CO2 respired below the monitored stem segment, likely coming from the roots. Our results highlight the role of nutrient availability on the dependency of R-S on eCO(2) and suggest stimulated root respiration under eCO(2) that may shift vertical gradients in xylem [CO2] confounding the interpretation of E-A measurements.
Keywords
CO2 enrichment, Eucalyptus tereticornis, EucFACE, growth respiration, nutrient-limited growth, woody tissue respiration, xylem CO2 transport, ATMOSPHERIC CO2, PLANT RESPIRATION, CARBON-DIOXIDE, PHOSPHORUS AVAILABILITY, MAINTENANCE RESPIRATION, DAYTIME DEPRESSION, EXTERNAL FLUXES, WOODY TISSUES, RESPONSES, TREES

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Citation

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Chicago
Salomon Moreno, Roberto Luis, Kathy Steppe, Kristine Y Crous, Nam Jin Noh, and David S Ellsworth. 2019. “Elevated CO2 Does Not Affect Stem CO2 Efflux nor Stem Respiration in a Dry Eucalyptus Woodland, but It Shifts the Vertical Gradient in Xylem [CO2].” Plant Cell and Environment 42 (7): 2151–2164.
APA
Salomon Moreno, R. L., Steppe, K., Crous, K. Y., Noh, N. J., & Ellsworth, D. S. (2019). Elevated CO2 does not affect stem CO2 efflux nor stem respiration in a dry Eucalyptus woodland, but it shifts the vertical gradient in xylem [CO2]. PLANT CELL AND ENVIRONMENT, 42(7), 2151–2164.
Vancouver
1.
Salomon Moreno RL, Steppe K, Crous KY, Noh NJ, Ellsworth DS. Elevated CO2 does not affect stem CO2 efflux nor stem respiration in a dry Eucalyptus woodland, but it shifts the vertical gradient in xylem [CO2]. PLANT CELL AND ENVIRONMENT. 2019;42(7):2151–64.
MLA
Salomon Moreno, Roberto Luis et al. “Elevated CO2 Does Not Affect Stem CO2 Efflux nor Stem Respiration in a Dry Eucalyptus Woodland, but It Shifts the Vertical Gradient in Xylem [CO2].” PLANT CELL AND ENVIRONMENT 42.7 (2019): 2151–2164. Print.
@article{8617687,
  abstract     = {To quantify stem respiration (R-S) under elevated CO2 (eCO(2)), stem CO2 efflux (E-A) and CO2 flux through the xylem (F-T) should be accounted for, because part of respired CO2 is transported upwards with the sap solution. However, previous studies have used E-A as a proxy of R-S, which could lead to equivocal conclusions. Here, to test the effect of eCO(2) on R-S, both E-A and F-T were measured in a free-air CO2 enrichment experiment located in a mature Eucalyptus native forest. Drought stress substantially reduced E-A and R-S, which were unaffected by eCO(2), likely as a consequence of its neutral effect on stem growth in this phosphorus-limited site. However, xylem CO2 concentration measured near the stem base was higher under eCO(2), and decreased along the stem resulting in a negative contribution of F-T to R-S, whereas the contribution of F-T to R-S under ambient CO2 was positive. Negative F-T indicates net efflux of CO2 respired below the monitored stem segment, likely coming from the roots. Our results highlight the role of nutrient availability on the dependency of R-S on eCO(2) and suggest stimulated root respiration under eCO(2) that may shift vertical gradients in xylem [CO2] confounding the interpretation of E-A measurements.},
  author       = {Salomon Moreno, Roberto Luis and Steppe, Kathy and Crous, Kristine Y and Noh, Nam Jin and Ellsworth, David S},
  issn         = {0140-7791},
  journal      = {PLANT CELL AND ENVIRONMENT},
  keywords     = {CO2 enrichment,Eucalyptus tereticornis,EucFACE,growth respiration,nutrient-limited growth,woody tissue respiration,xylem CO2 transport,ATMOSPHERIC CO2,PLANT RESPIRATION,CARBON-DIOXIDE,PHOSPHORUS AVAILABILITY,MAINTENANCE RESPIRATION,DAYTIME DEPRESSION,EXTERNAL FLUXES,WOODY TISSUES,RESPONSES,TREES},
  language     = {eng},
  number       = {7},
  pages        = {2151--2164},
  title        = {Elevated CO2 does not affect stem CO2 efflux nor stem respiration in a dry Eucalyptus woodland, but it shifts the vertical gradient in xylem [CO2]},
  url          = {http://dx.doi.org/10.1111/pce.13550},
  volume       = {42},
  year         = {2019},
}

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