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中文摘要：
在盆栽条件下，对保水剂处理的杜梨苗木的生长及生理状况进行比较研究。研究结果表明，在自然生长环境中，3种保水剂用量处理对杜梨苗木生长量依次为T2（50g／盘）、T3（70g／盘），T1（25g／盘），且生长量显著高于对照；而在干旱胁迫条件下，随着保水剂用量增加生长量也增加，且苗木生存期显著延长，比对照显著提高29．7％～58．2％。在干旱胁迫前期，净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）随剂量增加而上升，但达到一定剂量会受水分的胁迫而下降；而在干旱21d时，净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）随剂量增加而上升。
英文摘要：
An experimental study was carried out on the water absorption and conservation of soil under the condition of different doses of water retainers（25 g/pot, 50 g/pot,75 g/pot and no） ,and the growth and physiology of P. betulaefolia Bge. were compared under the pot - cultivation conditions. The results showed that the order of the restrained degrees of the growth treated with three water retainers were 50 g/pot 〉 70 g/pot 〉 25 g/pot, they were significantly higher than that of the control（ P 〈 0.05） under natural environmental conditions. However, under drought stress, with the increase of the doses of water retainers, the biomass and mean survival time of the seedlings increased. Pn, Gs, Tr increased with the increase of the doses of water retainers, then decreased under water stress, during the former 7 days of drought stress. On the 21st day of drought stress, the Pn, Gs, Tr increased with the increase of doses of water retainers.
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