To Platycladus orientalis seedlings, it is 0.1mg/L> 0.2mg/L>0mg/L>0.3mg/L>0.4mg/L, suggesting that the drought resistance of three arbor seedlings were more raised by lower concentration NBR treatment than higher concentration NBR treatment.

• 得出不同浓度NBR 处理提高刺槐苗木抗旱性；其顺序为0.；2mg/L>0