牛膝菊对黄山乡土植物柔毛水杨梅的化感作用

以外来入侵杂草牛膝菊(Galinsoga parviflora)根、茎、叶水浸提液处理黄山乡土植物柔毛水杨梅(Geum japonicum var.chinense)种子,并对其萌发效果进行研究。结果表明:不同器官浸提液对柔毛水杨梅种子的萌发率以及萌发速度均表现出很强的抑制作用,且随各浸提液质量浓度的增加抑制作用相应增强,但各浸提液的影响存在一定差异性。当茎、叶浸提液质量浓度均为0.1 g/mL、根浸提液质量浓度为0.08 g/mL时,对种子萌发的抑制作用达到最强;同一器官浸提液在0～0.1 g/mL质量浓度范围内,对种子萌发的抑制作用随浓度的增加而加强,当质量浓度为0.1 g/mL时,延迟作用最为显著,但茎、叶浸提液质量浓度为0.02 g/mL时,对萌发速率没有延迟却有加速作用。分析认为,抑制作用可能是多种化感物质共同作用的结果,且它们的性质、活性各不相同。

Allelopathy of invasive plant of Galinsoga parviflora on the seeds of Geum japonicum var.chinense from Huangshan

The effects of leaching water extracted from the root,stem,and leaf of the invasive plants of Galinsoga parviflora on the seeds of the local plants Geum japonicum var.chinense were studied in this paper.The results showed that: the leaching water from different organs inhibited the rate and speed of seed germination of G.japonicum var.chinense and as the concentration of leaching water increased,the suppression increased,while the inhibition effect of the leaching water from different organs was different.The inhibition effect achieved the peak when the concentration of the leaching water of shoots,leaves and roots were 0.1 g/mL,0.1 g/mL and 0.08 g/mL,respectively.When the concentration of the leaching water from all organs was less than 0.1 g/mL,the suppression increased as the concentration of the leaching water increased.However,when the concentration of leaching water extracted from shoots and leaves reached 0.02 g/mL,the leaching water would accelerate the germination.Our study showed that the inhibition effect was the result of several compound acted together.