The fact that the xerop - hyte grows naturally in desert presents that the sprout of xerophyte has special adaptive ability to endure the first draught season in its life . it is the most essential factor for the sprout of the xerophyte going through the first hot summer to build up the xeromorphic structure and physiological function 在水分条件渐减乃至干旱、炎热的立地条件中，幼苗能否及时适应? ?旱生结构的迅速形成与生理功能的迅速完善，是决定旱生植物能否在荒漠气候条件下继续生长的至关重要的因素。
