提高胡杨种子萌发率初探

胡杨(populus euphratzica)是我国干旱区唯一能自然形成大面积森林的乔木树种，是耐旱耐盐碱的重要林木，对遏制沙漠扩展、保护和改善生态环境起到了重要作用。胡杨种子成熟后，在自然状态下经30d左右将丧失萌发能力。经密封低温储存后，种子寿命将延长，但随储存期的延长，种子的萌发率也很快降低。为了提高储存的胡杨种子的萌发率，为后续人工营造胡杨林提供方便，本项研究是基于单因素多水平探索之后进一步的工作。采用了赤霉素(GA3)、硝酸钢(La(NO3)3)、萘乙酸(NAA)、氯化铜(CuCl2)单因子两水平多重复试验和四因子两水平互作效应的正交实验。结果表明：赤霉素单因子处理胡杨种子，在两水平间差异显著，20mg／L赤霉素处理对胡杨种子的萌发有一定的抑制作用；氯化铜溶液单因子处理胡杨种子，对提高萌发率效果显著，尤其以10mg／L的氯化铜处理，能提高种子萌发率大约10％；赤霉素与硝酸钢两因子间的互作效应，在两水平间差异显著，以10mg／L赤霉素与20mg／L硝酸钢的互作对胡杨种子萌发率的提高有显著促进作用；萘乙酸与氯化铜两因子间的互作效应，在两水平间差异极显著。尤其以5mg／L的萘乙酸与10mg／L的氯化铜互作时，对胡杨种子萌发率的提高有显著促进作用。

Initial Studies on Increase Germination Percentage of Populus Euphratica Seeds

In order to increase the germination percentage of Populus Euphratica stored seeds, we designed the experiments of mono factor on two level, many repetitions, and four factor on two level interactions separately by Gibberellin(GA_3), Nitric acid lanthanum (La(NO_3)_3), Naphthalene acetic acid (NAA), Chlorinated copper (CuCl_2) reagents and water (contrast). The results indicated that the imparity of effects is notable after treated the P. Euphratica seeds by GA_3 on two level to promote germination, it is a negative effects treating with 20 mg/L GA_3. The positive action is remarkable by CuCl_2, the germination percentage about 10% can be increased especially by 10 mg/L CuCl_2. The interaction effects between GA_3 and La(NO_3)_3 on two level is marked, it can increase the percentage when treated the seeds by 10 mg/L GA_3 and 20 mg/L La(NO_3)_3. The interaction between NAA and CuCl_2 to promote sprout is notable extremely, the interaction between 5 mg/L NAA and 10 mg/L CuCl_2 can promote the seeds to pullulate in particular.