我国各地更新造林基本上使用裸根苗。苗木在起苗、换床、造林生产环节中苗根暴露在空间与日光条件下,使苗木体内水分有所散失。水分散失影响到苗木自身的水分平衡,因而,栽植后发育不良造成死亡。为探讨苗木在日晒条件下失水多少对苗木发育与成活影响的规律,我们对樟子松、红松、红皮云杉、兴安落叶松,水曲柳,大青杨六个树 Basically, we use bare root seedlings to reforest our country. Seedlings in the starting seedlings, changing beds, afforestation production processes in the exposed roots in space and sunlight conditions, the seedling body water has been lost. Water loss affects the water balance of the seedlings themselves, and therefore, death caused by dysplasia after planting. In order to explore the law of seedling loss and seedling growth and survival under the sun exposure conditions, we studied six trees of Pinus sylvestris, Pinus koraiensis, Picea koraiensis, Larix gmelinii, Ash,