草业学报2017，Vol.26Issue(5)：51-61,11.DOI:10.11686/cyxb2016217
不同氮添加对入侵植物瘤突苍耳和本地近缘 植物苍耳及两者杂交种的生长影响
Effect of nitrogen treatments on growth of the invasive plant Xanthium strumarium,the native plant Xanthium sibiricum,and their reciprocal crosses
摘要
Abstract
The effect of soil nutrients on the invasion of alien plants is a hot topic in invasion biology research, but few studies have focused on the effects of soil nutrients on the characteristics of reciprocally crossing plants.In this study,we analyzed the differences in biomass accumulation and distribution,growth character-istics ,and photosynthetic characteristics of the invasive plant Xanthiumstrumarium,the native plant Xanthi-umsibiricum,and their reciprocal crosses (Xst♀× Xsi♂ and Xsi♀× Xst♂)under different nitrogen treat-ments,to explore the relationship between invasion and soil nutrient status.The stem diameter,total leaf are-a,total biomass,root biomass,root biomass ratio,and root mass/crown mass ratio of X.strumarium,X. sibiricum,and their reciprocal crosses (Xst♀×Xsi♂)increased significantly (P<0.05)and the leaf area to root mass ratio decreased significantly (P<0.05)with increasing nitrogen levels in the soil.The net assimila-tion rate ofX.strumariumwas significantly higher than that ofX.sibiricum(P<0.05),but its specific leaf area was significantly lower than that of X.sibiricum (P<0.05).The relative growth rate,net assimilation rate,and mean leaf area ratio were higher in the male progeny than in the female progeny (P<0.05),and the biomass index and growth index were higher in Xst♀×Xsi♂plants than in Xsi♀ × Xst♂plants.We conclu-ded that:1 )when nutrients are limited,X.strumarium distributes more biomass to the root,possibly as an ecological strategy to adapt to nutrient-heterogenous environments during invasion.2 )Compared with the hy-brid progenies of X.sibiricum,those of X.strumarium show stronger growth and increased reproductive abil-ity,which are properties that will further strengthen their invasiveness.关键词
瘤突苍耳/氮处理/杂交/入侵Key words
Xanthium strumarium/nitrogen treatments/hybridization/invasion引用本文复制引用
荀挚峰,白龙,曲波,许玉凤,李光海,詹忠浪,石九曜..不同氮添加对入侵植物瘤突苍耳和本地近缘 植物苍耳及两者杂交种的生长影响[J].草业学报,2017,26(5):51-61,11.基金项目
辽宁省农业攻关及成果产业化项目(201421400)资助. （201421400）
