中文摘要：

对廊坊杨（Populus lanffangensis W．）进行聚丙烯酰胺型保水剂（大颗粒、小颗粒、粉末）处理和盆栽控水试验，研究水分胁迫下，保水剂处理苗木对其生长特征和土壤水分的影响。结果表明：水分胁迫下，保水剂处理苗木能够显著增加苗木的基径、苗高，促进苗木的根系生长，增加根系数量、生物量和叶面积；显著增加土壤水分，在土壤严重干旱时，土壤中仍有充足的水分供植物生长利用；3种保水剂剂型中，小颗粒保水剂使用效果最好。

英文摘要：

An experiment was conducted to study the growth characteristics and soil water content （SWC） of Populus langfangensis potted seedhngs treated with super absorbent polymers （SAP） under water stress. Results showed that the seedlings treated with SAP had an obvious increase in basal diameter, seedling height and number of roots, and SAP increased leaf area and biomass and also accelerated root growth. Soil treated with SAP had enough water to supply seedlings for their growth under prolonged water stress. Among the three kinds of SAP, the effect of SAP with small size granule is the best.