摘要
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, a notorious invasive weed species highly dependent on AM iungi （AMF）, has been spreading rapidly in eastern China. At present, nitrogen deposition has become one of the most concerned environmental issues, but few studies have focused on the effects of AMF and nitrogen deposition on the growth of S. canadensis. In this paper, a green house pot culture experiment was conducted to study the effects of inoculating AMF on the growth and biomass accumulation of S. canadensis seedlings under different nitrogen application levels. Inoculating AMF had significant positive effects on the leaf number, biomass accumulation, and AMF colonization rate of seedlings. Also, with the extension of the treatment period, the promo tion effects of AMF on the plant height and leaf number were increasing. However, both nitrogen deposition and the interaction between AMF and nitrogen deposition had no significant effects on the seedlings＇ growth. Different nitrogen application levels had definite influence on the effects of AMF. It was suggested that AMF had significant promotion effects on the invasion of S. canaden sis, and the variation of exogenous nitrogen supply level determined the degree of host plant bene fit derived from AMF.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第11期2953-2958,共6页
Chinese Journal of Ecology
基金
植被与环境变化国家重点实验室开放课题项目(LVEC-2012kf05)
浙江省自然科学基金项目(LQ12C03002
Y3110200)
国家自然科学基金项目(31270497
31100325)
浙江省教育厅科研项目(Y201017730)资助
关键词
AM真菌
氮沉降
加拿大一枝黄花
生长
AM fungi
nitrogen deposition
Solidago canadensis
growth.
