Effects of Water State of Soil on Ecological Boundary of Leaf Surface of Populus davidiana

The effect of water state of soil on eco-boundary over leal surface was disscussed by takin Populus davidiana as experimental material. The results show that to change soil water state by some methods was to adjust and control the forming quality of eco-boundary in fact. The plant in good water condition must be accompanied by thinner eco-boundary. This eco-boundary is beneficial to exchange and flow of the substances between plant and environment.