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通过温室控制试验,研究了氮碳素添加及丛枝菌根(AM)对外来入侵植物豚草生长的影响.结果表明:氮素添加对豚草的形态指标、生物量及其分配特征和生长速率均没有显著影响,却使豚草地上器官和根的氮含量显著增加;碳素添加增加了土壤中的有效氮含量,促使豚草增加营养吸收器官的生物量分配以缓解养分(氮素)胁迫,导致分枝数、总叶面积、比叶面积和叶生物量比明显降低,总生物量显著减少.豚草与AM真菌共生增强了其适应土壤氮素变化的能力,增加了比叶面积,提高了豚草的资源获取能力,其作用在土壤有效氮含量低时更加明显.AM真菌对豚草适应低氮生境有着重要意义.
The effects of nitrogen and arbuscular mycorrhizal (AM) on the invasive algae ragweed (Glycyrrhiza uralensis Fisch) were studied through greenhouse control experiments.The results showed that the effects of N on the morphological traits, biomass, distribution and growth of ragweed The nitrogen content of the aboveground organs and roots of ragweed increased significantly; the addition of carbon increased the available nitrogen content in the soil and led ragweed to increase the biomass allocation of nutrient uptake organs to alleviate the nutrient (nitrogen) Under stress, the number of branches, the total leaf area, specific leaf area and leaf biomass decreased significantly, and the total biomass decreased significantly.The symbiosis between AR and arbuscular mycorrhizal fungi increased their ability to adapt to soil N and increased the specific leaf area , Which raises the ability of ragweed to gain access to resources, which is more obvious when the content of soil available N is low.AM fungi is very important for ragweed to adapt to low nitrogen habitat.