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- W2064827158 abstract "Leaf specific conductivities (LSC's) were measured on stem segments excised from various points within the canopy of eastern white cedar trees, Thuja occidentalis L. LSC is defined as the water flow rate (kilograms per second) through a stem caused by a unit of pressure potential gradient (megapascals per metre) per unit leaf surface area supplied by the stem (square metres). LSC's were measured on stems of various diameters and were found to vary over a factor of 30 in magnitude from 1 × 10 −5 kg s −1 m −1 MPa −1 for stems 1 mm in diameter to 3 × 10 −4 kg s −1 m −1 MPa −1 for stems 100 mm in diameter. LSC was found to be related to stem diameter (D (millimetres)) by the following empirical formula: LSC = 9.58 × 10 −6 × D 0.727 . LSC's measured on stem segments including a node had significantly lower LSC's than internodal stem segments of the same length. Various water relations parameters were measured on cedar trees on a diurnal basis including evaporative flux, leaf resistance to evaporation, shoot water potential, air temperature, and air humidity. Water potential isotherms were also measured on excised green shoots. From the above data, we estimate that about 15% of the total water evaporated from green shoots comes from stored water while the shoot water potentials are growing progressively negative. The typical peak evaporative flux in midday was 1.5 × 10 −5 kg s −1 m −2 ; using this value and our measured LSC's we estimate that the pressure potential gradients in the stems must be 50 kPa m −1 in stems 100 mm in diameter and 1500 kPa m −1 in stems 1 mm in diameter. Pressure potential gradients were measured in stems 30 to 50 mm in diameter by the pressure bomb technique and were found to be 69 kPa m −1 during a typical afternoon and this confirms the accuracy of the above estimates." @default.
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- W2064827158 date "1983-08-01" @default.
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- W2064827158 title "The hydraulic architecture of <i>Thuja occidentalis</i>" @default.
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- W2064827158 doi "https://doi.org/10.1139/b83-226" @default.
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