A review of new research progress on the vulnerability of xylem embolism of woody plants Relationships between Xylem Vessel Structure and Embolism Vulnerability in Four Populus Clones 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 Relationships between xylem structure and embolism vulnerability in six species of drought tolerance trees