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Daytime depression in temperature-normalised stem CO2 efflux in young poplar trees is dominated by low turgor pressure rather than by internal transport of respired CO2

(2018) NEW PHYTOLOGIST. 217(2). p.586-598
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Abstract
Daytime decreases in temperature-normalised stem CO2 efflux (E-A_D) are commonly ascribed to internal transport of respired CO2 (F-T) or to an attenuated respiratory activity due to lowered turgor pressure. The two are difficult to separate as they are simultaneously driven by sap flow dynamics. To achieve combined gradients in turgor pressure and F-T, sap flow rates in poplar trees were manipulated through severe defoliation, severe drought, moderate defoliation and moderate drought. Turgor pressure was mechanistically modelled using measurements of sap flow, stem diameter variation, and soil and stem water potential. A mass balance approach considering internal and external CO2 fluxes was applied to estimate F-T. Under well-watered control conditions, both turgor pressure and sap flow, as a proxy of F-T, were reliable predictors of E-AD. After tree manipulation, only turgor pressure was a robust predictor of E-AD. Moreover, F-T accounted for <15% of E-AD. Our results suggest that daytime reductions in turgor pressure and associated constrained growth are the main cause of E-AD in young poplar trees. Turgor pressure is determined by both carbohydrate supply and water availability, and should be considered to improve our widely used but inaccurate temperature-based predictions of woody tissue respiration in global models.
Keywords
carbon fluxes, growth respiration, maintenance respiration, mechanistic modelling, PopulusxCanadensis Moench Vesten', radial stem growth, transpiration, xylem CO2 transport, CARBON-DIOXIDE EFFLUX, SUB-MEDITERRANEAN OAK, LOBLOLLY-PINE TREES, SAP-FLOW, MAINTENANCE RESPIRATION, PLANT RESPIRATION, DIAMETER VARIATIONS, XYLEM SAP, GROWTH, WATER

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Citation

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MLA
Salomon Moreno, Roberto Luis, Veerle De Schepper, María Valbuena-Carabaña, et al. “Daytime Depression in Temperature-normalised Stem CO2 Efflux in Young Poplar Trees Is Dominated by Low Turgor Pressure Rather Than by Internal Transport of Respired CO2.” NEW PHYTOLOGIST 217.2 (2018): 586–598. Print.
APA
Salomon Moreno, R. L., De Schepper, V., Valbuena-Carabaña, M., Gil, L., & Steppe, K. (2018). Daytime depression in temperature-normalised stem CO2 efflux in young poplar trees is dominated by low turgor pressure rather than by internal transport of respired CO2. NEW PHYTOLOGIST, 217(2), 586–598.
Chicago author-date
Salomon Moreno, Roberto Luis, Veerle De Schepper, María Valbuena-Carabaña, Luis Gil, and Kathy Steppe. 2018. “Daytime Depression in Temperature-normalised Stem CO2 Efflux in Young Poplar Trees Is Dominated by Low Turgor Pressure Rather Than by Internal Transport of Respired CO2.” New Phytologist 217 (2): 586–598.
Chicago author-date (all authors)
Salomon Moreno, Roberto Luis, Veerle De Schepper, María Valbuena-Carabaña, Luis Gil, and Kathy Steppe. 2018. “Daytime Depression in Temperature-normalised Stem CO2 Efflux in Young Poplar Trees Is Dominated by Low Turgor Pressure Rather Than by Internal Transport of Respired CO2.” New Phytologist 217 (2): 586–598.
Vancouver
1.
Salomon Moreno RL, De Schepper V, Valbuena-Carabaña M, Gil L, Steppe K. Daytime depression in temperature-normalised stem CO2 efflux in young poplar trees is dominated by low turgor pressure rather than by internal transport of respired CO2. NEW PHYTOLOGIST. 2018;217(2):586–98.
IEEE
[1]
R. L. Salomon Moreno, V. De Schepper, M. Valbuena-Carabaña, L. Gil, and K. Steppe, “Daytime depression in temperature-normalised stem CO2 efflux in young poplar trees is dominated by low turgor pressure rather than by internal transport of respired CO2,” NEW PHYTOLOGIST, vol. 217, no. 2, pp. 586–598, 2018.
@article{8564018,
  abstract     = {Daytime decreases in temperature-normalised stem CO2 efflux (E-A_D) are commonly ascribed to internal transport of respired CO2 (F-T) or to an attenuated respiratory activity due to lowered turgor pressure. The two are difficult to separate as they are simultaneously driven by sap flow dynamics. 
To achieve combined gradients in turgor pressure and F-T, sap flow rates in poplar trees were manipulated through severe defoliation, severe drought, moderate defoliation and moderate drought. Turgor pressure was mechanistically modelled using measurements of sap flow, stem diameter variation, and soil and stem water potential. A mass balance approach considering internal and external CO2 fluxes was applied to estimate F-T. 
Under well-watered control conditions, both turgor pressure and sap flow, as a proxy of F-T, were reliable predictors of E-AD. After tree manipulation, only turgor pressure was a robust predictor of E-AD. Moreover, F-T accounted for <15% of E-AD. 
Our results suggest that daytime reductions in turgor pressure and associated constrained growth are the main cause of E-AD in young poplar trees. Turgor pressure is determined by both carbohydrate supply and water availability, and should be considered to improve our widely used but inaccurate temperature-based predictions of woody tissue respiration in global models.},
  author       = {Salomon Moreno, Roberto Luis and De Schepper, Veerle and Valbuena-Carabaña, María and Gil, Luis and Steppe, Kathy},
  issn         = {0028-646X},
  journal      = {NEW PHYTOLOGIST},
  keywords     = {carbon fluxes,growth respiration,maintenance respiration,mechanistic modelling,PopulusxCanadensis Moench Vesten',radial stem growth,transpiration,xylem CO2 transport,CARBON-DIOXIDE EFFLUX,SUB-MEDITERRANEAN OAK,LOBLOLLY-PINE TREES,SAP-FLOW,MAINTENANCE RESPIRATION,PLANT RESPIRATION,DIAMETER VARIATIONS,XYLEM SAP,GROWTH,WATER},
  language     = {eng},
  number       = {2},
  pages        = {586--598},
  title        = {Daytime depression in temperature-normalised stem CO2 efflux in young poplar trees is dominated by low turgor pressure rather than by internal transport of respired CO2},
  url          = {http://dx.doi.org/10.1111/nph.14831},
  volume       = {217},
  year         = {2018},
}

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