水分胁迫和母树年龄对山东半岛黑松沿海防护林种子萌发的影响

Effects of Water Stress and Mother Tree Age on Seed Germination of the Coastal Pinus thunbergii Protection Forest in Northern Shandong Peninsula

以山东半岛黑松沿海防护林种子为实验材料,研究了水分胁迫和母树年龄对黑松种子萌发的影响。结果表明,随水分胁迫程度增加,种子的发芽率、发芽指数和活力指数呈波浪形降低,而平均发芽时间增加,种子萌发受到显著抑制。随母树年龄增加,种子的发芽率、发芽指数和活力指数呈波浪形增加,种子质量明显提高。对于发芽率,水分胁迫和母树年龄有着显著交互作用。母树年龄的增加使得发芽率在水分胁迫下降低变缓,提高了种子耐水分胁迫能力。因此,母树特性与生态因子的共同作用是黑松海防林天然更新的重要决定因素。

In this paper,Pinus thunbergii seeds of different mother tree age were collected from the coast protection forest in northern Shandong Peninsula.The effects of water stress and mother tree age on seed germination were tested.As water stress aggravated,germination rate（GR）,germination index（GI）and vigor index（VI）showed an undulating decrease,whereas mean germination time increased,which suggested seed germination was inhibited by water stress.With increasing mother tree age,GR,GI and VI increased undulatingly,which indicated seed quality enhanced significantly.There was significant interaction on Gi between water stress and mother tree age.The decrease velocity of GR deriving from water stress became slowly due to the increase of mother tree age,which suggested mother tree age enhanced seed water stress resistance.The combination of mother tree age and ecological factors was a vital determinant on the natural regeneration of the coastal P.thunbergii protection forest.