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- W2115896557 abstract "Ecosystem respiration is known to vary following changes in canopy photosynthesis. However, the timing of this coupling is not well understood. Here, we summarize the literature on soil and ecosystem respiration where the speed of transfer of photosynthetic sugars from the plant canopy via the phloem to the roots was determined. Estimates of the transfer speed can be grouped according to whether the study employed isotopic or canopy/soil flux-based techniques. These two groups should provide different estimates of transfer times because transport of sucrose molecules, and pressure-concentration waves, in phloem differ. A steady-state and a dynamic photosynthesis/phloem-transport/soil gas diffusion model were employed to interpret our results. Starch storage and partly soil gas diffusion affected transfer times, but phloem path-length strongly controlled molecule transfer times. Successful modelling required substantially different phloem properties (higher specific conductivity and turgor pressure difference) in tall compared with small plants, which is significant for our understanding of tall trees' physiology. Finally, we compared isotopic and flux-based approaches for the determination of the link between canopy photosynthesis and ecosystem respiration. We conclude that isotopic approaches are not well suited to document whether changes in photosynthesis of tall trees can rapidly affect soil respiration." @default.
- W2115896557 created "2016-06-24" @default.
- W2115896557 creator A5060221969 @default.
- W2115896557 creator A5088437443 @default.
- W2115896557 date "2009-10-13" @default.
- W2115896557 modified "2023-10-05" @default.
- W2115896557 title "The significance of phloem transport for the speed with which canopy photosynthesis and belowground respiration are linked" @default.
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- W2115896557 doi "https://doi.org/10.1111/j.1469-8137.2009.03050.x" @default.
- W2115896557 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19825019" @default.
- W2115896557 hasPublicationYear "2009" @default.
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