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Linking nonstructural carbohydrate dynamics to gas exchange and leaf hydraulic behavior in Pinus edulis and Juniperus monosperma

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  • Leaf hydraulics, gas exchange and carbon storage in Pinus edulis and Juniperus monosperma, two tree species on opposite ends of the isohydry–anisohydry spectrum, were analyzed to examine relationships between hydraulic function and carbohydrate dynamics. Leaf hydraulic vulnerability, leaf water potential (Wl), leaf hydraulic conductance (Kleaf), photosynthesis (A), stomatal conductance (gs) and nonstructural carbohydrate (NSC) content were analyzed throughout the growing season. Leaf hydraulic vulnerability was significantly lower in the relatively anisohydric J. monosperma than in the more isohydric P. edulis. In P. edulis, ψ₁ dropped and stayed below 50% loss of leaf hydraulic conductance (P₅₀) early in the day during May, August and around midday in September, leading to sustained reductions in K[subscript leaf]. In J. monosperma, ψ₁ dropped below P₅₀ only during August, resulting in the maintenance of K[subscript leaf] during much of the growing season. Mean A and g[subscript s] during September were significantly lower in P. edulis than in J. monosperma. Foliar total NSC was two to three times greater in J. monosperma than in P. edulis in June, August and September. Consistently lower levels of total NSC in P. edulis suggest that its isohydric strategy pushes it towards the exhaustion of carbon reserves during much of the growing season.
  • Keywords: Juniperus monosperma, Carbon storage, Leaf hydraulics, Pinus edulis, Carbon starvation, Growth limitation, Nonstructural carbohydrate (NSC), Drought
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  • Woodruff, D. R., Meinzer, F. C., Marias, D. E., Sevanto, S., Jenkins, M. W., & McDowell, N. G. (2015). Linking nonstructural carbohydrate dynamics to gas exchange and leaf hydraulic behavior in Pinus edulis and Juniperus monosperma. New Phytologist, 206(1), 411-421. doi:10.1111/nph.13170
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  • 206
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  • 1
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  • This work was supported in part by interagency agreement DE-NA0001302 between Los Alamos National Laboratory and the USDA Forest Service Pacific Northwest Research Station, and by the Department of Energy, Office of Science.
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