通水抵抗度
水の流れにくさを示す指標で、通水抵抗を試料(枝など)の長さで標準化した値。通水度(Kh)の逆数。
$R =r / l$
($s・MPa・m^{-4}$ 、$s・MPa・kg^{-1}$ もしくは $s・MPa・mmol^{-1}$)
Tyree MT, Ewers F (1991) The hydraulic architenture of trees and other woody plants. New Phytologist, 119: 345-360
Sperry JS (1995) Limitation on stem water transport and their consequences. In: Gartner BL(ed), Plant stems Physiology and functional morpholog, 105-106. Academic Press, San Diego