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- W2761375897 abstract "Daytime decreases in temperature-normalised stem CO2 efflux (EA_D) are commonly ascribed to internal transport of respired CO2 (FT) 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 FT, 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 FT. Under well-watered control conditions, both turgor pressure and sap flow, as a proxy of FT, were reliable predictors of EA_D. After tree manipulation, only turgor pressure was a robust predictor of EA_D. Moreover, FT accounted for < 15% of EA_D. Our results suggest that daytime reductions in turgor pressure and associated constrained growth are the main cause of EA_D 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." @default.
- W2761375897 created "2017-10-20" @default.
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- W2761375897 date "2017-10-06" @default.
- W2761375897 modified "2023-10-14" @default.
- W2761375897 title "Daytime depression in temperature-normalised stem CO<sub>2</sub>efflux in young poplar trees is dominated by low turgor pressure rather than by internal transport of respired CO<sub>2</sub>" @default.
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- W2761375897 doi "https://doi.org/10.1111/nph.14831" @default.
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