Foundation for the Impossible of Cohesion Theory
Abstract：The water potential measured by using the pressure chamber technique is lack of correctional values, much high- er than the actual one, which can only reflect changes in the size of water potential, rather than represent their true negative pressure inside the xylem. Transpiration can prompt the xylem to produce no more than --0.1MPa limited negative pressure, as a result, the view that there is a huge vacuum inside the xylem is deficient of theoretical basis and direct experimental evidence. Continuous water column doesn＇t exist because the inevitable cavitation make it can not maintain continuous. The water inside xylem is moving from the top to down section by section, deviating from the principle of cohesion. Negative pressure made by transpiration can keep the root absorbing water after transpiration.
Keywords：Cohesion TheoryPressure Chamber TechniqueXylem Negative PressureContinuous Water ColumnWater Move Mode
Publication Date：2011-07-02
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 89-91 )