木本植物木质部内水柱不连续的证据

The evidence of discontinuous water column inside the xylem of woody plants

利用压力注水的方法使枝干木质部内形成连续水柱,然后与未处理的枝干进行压力测试对比,结果显示只有连续水柱才能在底部产生0.01Mpa/m的压力,而水柱不连续的情况下底部测不到因重力产生的压力。树干液流时滞和木质部空穴现象对木质部水柱不连续均可提供有力的证据。

Using the pressure to inject water in the branch’s xylem to form a continuous water column,and then carrying stress test with the branch untreated.It shows that only continuous water column can make0.01Mpa/m pressure at the bottom,while there is no pressure due to gravity at the bottom under the discontinuous water column cases.Both trunk fluid flow delay and xylem cavitations can provide strong evidences for discontinuous water column inside the xylem.