Studies of roots and shoots vulnerability to xylem embolism in seven woody plants Relations between Xylem Embolisms and Physiological Indexes in Eight Woody Plants I. Relationships with Xylem Water Potentials Relations between Xylem Embolisms and Physiological Indexes in Eight Woody PlantsⅠ.Relationships with Xylem Water Potentials A review of new research progress on the vulnerability of xylem embolism of woody plants