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采用交互移植法,对移栽在6种不同生境中的5个不同种源紫茎泽兰幼苗的存活率、株高、分枝数、生物量、单株花序数、产种量和种子萌发率进行了为期1年的对比研究.结果表明:各种源紫茎泽兰的幼苗生长和繁殖特性对样地环境条件变化均表现出很强的可塑性.试验样地因素对幼苗株高、分枝数、生物量、单株花序数和产种量的影响均达到极显著水平(P<0.001).随着样地纬度和海拔的升高,各种源的幼苗株高、分枝数量、单株生物量、每株花序数量和单株产种量均呈下降趋势,且各样地间的差异均达到显著水平(P<0.05).但种源因素对幼苗株高、分枝数、生物量、单株花序数和产种量的影响均不显著(P>0.05).除单株产种量外,种源与试验样地的交互作用对上述各指标的影响均不显著.在各样地内,当地种源幼苗的存活率、生长能力和繁殖能力均未表现出显著的优势.说明紫茎泽兰在我国西南地区入侵成功主要依靠其较高的表型可塑性,而局域适应的作用相对较小.
The survival rate, plant height, branch number, biomass, number of inflorescences per plant, seed production and seed germination of five different provenances of Eupatorium adenophorum transplanted in 6 different habitats Rate of 1-year comparative study conducted.The results showed that: All kinds of Eupatorium seedling growth and reproduction characteristics of the plots of environmental conditions showed a strong plasticity of the experimental plot of seedling plant height, The number of branches, biomass, the number of inflorescences per plant and the yield of seedlings all reached the extremely significant level (P <0.001) .With the increase of latitude and altitude, the seedling height, branch number, The biomass per plant, the number of inflorescence per plant and the yield per plant all showed a decreasing trend, and the differences among the various plots reached significant levels (P <0.05), but the seedling factors had no significant effect on plant height, branch number, The biomass, number of inflorescence per plant and yield had no significant effects (P> 0.05) .In addition to the yield per plant, the interaction between provenances and experimental plots had no significant effect on the above indexes In all plots, the survival rate, growth ability and reproductive capacity of seedlings of local provenances did not show significant advantages. Invasion in southwest China’s success mainly depends on its high phenotypic plasticity and local adaptation of a relatively minor role.