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加拿大一枝黄花是我国东部地区广泛分布的恶性杂草,具有很强的菌根依赖性。目前,氮沉降已成为当今备受关注的全球性环境问题,然而关于菌根真菌和氮沉降对加拿大一枝黄花生长的研究鲜见报道。本实验采用大棚盆栽试验,研究了不同施氮水平下接种菌根真菌(AMF)对加拿大一枝黄花生长和生物量积累的影响。结果表明:AMF对加拿大一枝黄花的叶片数、生物量和菌根侵染率具有显著的正效应,同时,随着处理时间的延长,AMF对株高和叶片数的促进作用不断增强;而氮沉降、AMF和氮沉降的交互作用对其生长没有显著影响。另外,不同的氮供应水平对AMF的效应具有一定的影响。由此可见,菌根共生体对加拿大一枝黄花的入侵具有显著的促进效应,同时外界氮供应水平的不同也决定了加拿大一枝黄花从菌根真菌处获取收益的高低。
Solidago canadensis is a widely distributed malignant weed in eastern China with strong mycorrhizal dependency. At present, nitrogen deposition has become a global environmental issue of great concern. However, the research on the growth of Solidago canadensis on mycorrhizal fungi and nitrogen deposition is seldom reported. In this experiment, greenhouse pot experiment was conducted to study the effects of AMF on growth and biomass accumulation of Solidago canadensis at different nitrogen levels. The results showed that: AMF had significant positive effect on the number of leaves, biomass and mycorrhizal infection rate of Solidago canadensis. At the same time, AMF enhanced the plant height and number of leaves with the prolongation of treatment time; Sedimentation, AMF and nitrogen deposition had no significant effect on their growth. In addition, different levels of nitrogen supply have some effect on the effect of AMF. Thus, the mycorrhizae symbiont has significant promotion effect on the Solidago canadensis invasion, while the different levels of external nitrogen supply also determines the level of Solidago canadensis gain from mycorrhizal fungi.