模拟水分胁迫及复水对宁夏贺兰山油松种子萌芽的影响

采用不同浓度PEG-6000模拟水分胁迫，系统研究了水分胁迫及复水对贺兰山油松种子萌发的影响，主要包括发芽率、发芽速度、发芽指数、活力指数、芽长。结果表明，随着PEG浓度上升到20%~30%，上述指标均受到强烈抑制。复水后，除了发芽速度，其他发芽指标都显著低于对照，不同水分胁迫复水处理之间发芽指标差异不显著。这些发现为更好地理解贺兰山油松自然更新经营管理提供了依据。

Effects of Simulated Water Stress and Re-watering on the Germination of Pinus tabuliformis Seeds in Helan Mountains

Effects of water stress simulated by the different concentrations of polyethylene glycol (PEG)-6000 and re-watering on the germination of Pinus tabuliformis seeds in Helan mountains were studied systematically.Parameters included the germination percentage,germination speed,germination index,vitality index,and sprout length.The results showed that all the parameters mentioned above were restrained intensely when concentrations of PEG raised to 20%-30%.After re-watering,they all showed significantly lower values compared with the controls except for the parameter of germination speed.There was no significant difference in the parameters between rehydration treatments of different water stress.These findings will provide basis for better understanding of natural regeneration management of P.tabuliformis in Helan mountains.