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Transport in a coordinated soil-root-xylem-phloem leaf system

Publication ,  Journal Article
Huang, CW; Domec, JC; Palmroth, S; Pockman, WT; Litvak, ME; Katul, GG
Published in: Advances in Water Resources
September 1, 2018

Links between the carbon and water economies of plants are coupled by combining the biochemical demand for atmospheric CO2 with gas transfer through stomates, liquid water transport in the soil-xylem hydraulic system and sucrose export in the phloem. We formulated a model to predict stomatal conductance (gs), consistent with the maximum energy circulation concept of Lotka and Odum, by maximizing the sucrose flux out of photosynthesizing leaves. The proposed modeling approach recovers all prior results derived from stomatal optimization theories and profit-maximization arguments for the xylem hydraulic system aimed at predicting gs. The novel features of this approach are its ability to 1) predict the price of losing water in carbon units using xylem and phloem properties (i.e., the marginal water use efficiency) and 2) explain why water molecules become more expensive to exchange for CO2 molecules when soil moisture becomes limiting or when plants acclimate to new elevated atmospheric CO2 concentration. On short time-scales (sub-daily), predicted gs under many environmental stimuli were consistent with measurements reported in the literature, including a general sensitivity of gs to vapor pressure deficit and leaf water potential. During progressive droughts, differences in the coordination among the leaf, xylem, and phloem functioning determine the isohydric-to-anisohydric behavior among plants.

Duke Scholars

Published In

Advances in Water Resources

DOI

ISSN

0309-1708

Publication Date

September 1, 2018

Volume

119

Start / End Page

1 / 16

Related Subject Headings

  • Environmental Engineering
  • 4901 Applied mathematics
  • 4005 Civil engineering
  • 3707 Hydrology
  • 0907 Environmental Engineering
  • 0905 Civil Engineering
  • 0102 Applied Mathematics
 

Citation

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Huang, C. W., Domec, J. C., Palmroth, S., Pockman, W. T., Litvak, M. E., & Katul, G. G. (2018). Transport in a coordinated soil-root-xylem-phloem leaf system. Advances in Water Resources, 119, 1–16. https://doi.org/10.1016/j.advwatres.2018.06.002
Huang, C. W., J. C. Domec, S. Palmroth, W. T. Pockman, M. E. Litvak, and G. G. Katul. “Transport in a coordinated soil-root-xylem-phloem leaf system.” Advances in Water Resources 119 (September 1, 2018): 1–16. https://doi.org/10.1016/j.advwatres.2018.06.002.
Huang CW, Domec JC, Palmroth S, Pockman WT, Litvak ME, Katul GG. Transport in a coordinated soil-root-xylem-phloem leaf system. Advances in Water Resources. 2018 Sep 1;119:1–16.
Huang, C. W., et al. “Transport in a coordinated soil-root-xylem-phloem leaf system.” Advances in Water Resources, vol. 119, Sept. 2018, pp. 1–16. Scopus, doi:10.1016/j.advwatres.2018.06.002.
Huang CW, Domec JC, Palmroth S, Pockman WT, Litvak ME, Katul GG. Transport in a coordinated soil-root-xylem-phloem leaf system. Advances in Water Resources. 2018 Sep 1;119:1–16.
Journal cover image

Published In

Advances in Water Resources

DOI

ISSN

0309-1708

Publication Date

September 1, 2018

Volume

119

Start / End Page

1 / 16

Related Subject Headings

  • Environmental Engineering
  • 4901 Applied mathematics
  • 4005 Civil engineering
  • 3707 Hydrology
  • 0907 Environmental Engineering
  • 0905 Civil Engineering
  • 0102 Applied Mathematics