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朱砂根(Ardisia crenata)原产于东亚和东南亚地区,现已入侵美国南部等地区。为了探讨AM真菌对朱砂根入侵能力的影响,我们以根段接种的方法扩繁了源自入侵地美国德克萨斯州和原产地广东东莞、四川峨眉山和湖北兴山的朱砂根根系中的AM真菌,研究了这些不同来源的AM真菌对朱砂根生长和生理状况的影响。结果表明4个不同来源的AM真菌均能够提高朱砂根的叶面积比(LAR)和相对生长速率(RGR),而对其饱和净光合速率(Pn)、呼吸速率(Rd)、根冠比(R/S)和各器官中氮、磷营养元素含量均没有显著影响。四个不同来源的AM真菌对朱砂根的作用略有差异,其中入侵地德克萨斯州与原产地广东东莞AM真菌对朱砂根生长的促进作用较强,但入侵地AM真菌对朱砂根的促进作用并不普遍高于原产地,AM真菌的作用可能并不是导致入侵种群密度远高于本土种群密度的因素。
Ardisia crenata native to East Asia and Southeast Asia, has now invading the southern United States and other regions. In order to investigate the effect of AM fungi on the intrusion ability of R. soongorica, we disseminated root systems from roots invaded to Texas, USA, and originated in Dongguan, Guangdong, Emei in Sichuan Province and Xingshan in Hubei Province AM fungi, the effects of these different origins of AM fungi on the growth and physiological status of N. cinnabar were studied. The results showed that AM fungi from four different sources could improve the leaf area ratio (LAR) and relative growth rate (RGR) of the roots, while their net photosynthetic rate (Pn), respiration rate (Rd) R / S) and the content of nitrogen and phosphorus in various organs had no significant effect. Four different sources of AM fungi on the role of cinnabar root slightly different, in which Texas invade to the origin of Dongguan, Guangdong and AM fungi on the growth of cinnabar root promotion strong, but the invasion of AM fungi on the cinnabar root The accelerating effect is not generally higher than that of the place of origin, and the role of AM fungi may not be a factor that leads to a much higher density of invasive species than native population density.