摘要
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.
By using reciprocal transplant method, Eupatorium adenophorum Spreng. seedlings of five different provenances were reciprocally transplanted into six different sites in Yunnan Province, with the survival rate, plant height, branch number, biomass, flower number per plant, and seed production measured during the period from April 2007 to May 2008. The seedlings growth and reproductive traits of different provenance E. adenophorum all showed strong plasticity to environmental conditions. With increasing latitude and altitude of transplant site, plant height, branch number, biomass, flower number per plant, and seed production of different provenance E. adenophorum decreased, and the differences in these growth and reproductive traits were significant among the transplant sites. However, there were no significant differences in these traits among different provenance E. adenophorum. Provenance and transplant site had no significant interactive effects on the above-mentioned traits except seed production. At each site, the survival rate, growth potential, and reproductive capability of local provenance E. adenophorum didn＇ t have any superiority, illustrating that the success in the invasion of E. adenophorum in Yunnan Province was mainly due to the phenotypic plasticity of the plant, while local adaptability only played lesser important role.
出处
《应用生态学报》
CAS
CSCD
北大核心
2009年第7期1643-1649,共7页
Chinese Journal of Applied Ecology
基金
云南省自然科学基金项目(2006C0056M)
中国科学院"百人计划"项目(BRJH2002098)资助
关键词
紫茎泽兰
交互移植
表型可塑性
局域适应
Eupatorium adenophorum Spreng.
reciprocal transplant
phenotypie plasticity
local adaptation
