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- W2051138534 abstract "Abstract To reveal the mechanism of transpiration by hydrophytes in the field, it is necessary to evaluate the transpiration rate without the effect of the evaporation from the water surface. In order to test the suitability for evaluating the transpiration rate of lotus ( Nelumbo nucifera Gaertn.) leaves in the field, stem heat-balance method was applied and the obtained sap-flow rate was compared with the transpiration rate measured by weighing and with the overall canopy evapotranspiration rate by means of the eddy covariance technique. The transpiration rate estimated with the sap-flow measurements showed good agreement with that obtained from the weighing method. Lotus has many air canals in its petiole to carry oxygen-rich air to the rhizome and methane- and carbon dioxide-rich air back to the atmosphere, but there was little effect of the mass flow of air through these canals on the sap-flow rates. In the field observations, the canopy evapotranspiration rate (0.28 mm h −1 at maximum) was nearly equal to the sum of the transpiration rate from all sunlit leaves (0.30 mm h −1 ), and the contribution of the transpiration from shaded leaves and evaporation from the water surface was considered to be minor in the seasons when the leaves were fully developed. Evaluation of bulk leaf conductance revealed that the conductance in the leaf boundary layer of lotus could be low (ca. 0.23 mol m −2 s −1 ) because of its large leaf area. The low conductance in the leaf boundary layer would increase leaf temperature, which, in turn, would generate air circulation within the plant's ventilation system. Because there was a linear relationship between transpiration rate and the leaf-to-air vapor-pressure deficit, with no apparent maximum, high vapor-pressure deficits (3.4 kPa at maximum) did not appear to cause significant stomatal closure in lotus plants. The stomata of lotus leaves play a role as air inlets to carry oxygen-rich air to the rhizome, so their low sensitivity would help to increase air intake." @default.
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- W2051138534 date "2006-08-01" @default.
- W2051138534 modified "2023-09-24" @default.
- W2051138534 title "Evaluation of the transpiration rate of lotus using the stem heat-balance method" @default.
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- W2051138534 doi "https://doi.org/10.1016/j.aquabot.2006.03.006" @default.
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