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紫茎泽兰叶片化感作用对10种草本植物种子萌发和幼苗生长的影响
引用本文:郑丽,冯玉龙. 紫茎泽兰叶片化感作用对10种草本植物种子萌发和幼苗生长的影响[J]. 生态学报, 2005, 25(10): 2782-2787
作者姓名:郑丽  冯玉龙
作者单位:1. 中国科学院西双版纳热带植物园昆明分部,昆明,650223;中国科学院研究生院,北京,100049
2. 中国科学院西双版纳热带植物园昆明分部,昆明,650223
基金项目:中国科学院知识创新工程重大资助项目(KSCX1-SW-13-0X-0X)~~
摘    要:化感作用在生物入侵过程中具有重要的意义,紫茎泽兰具有化感物质,它能抑制豌豆等一些对化感物质敏感的植物种子萌发,但它对入侵早期直接与之竞争的植物的影响以及化感作用与其入侵性的关系还知之甚少。以紫茎泽兰入侵早期直接与之竞争的草本植物和为替代控制紫茎泽兰引进的牧草为材料,利用培养皿滤纸法研究紫茎泽兰叶片提取液对种子萌发和幼苗生长的影响,探讨化感作用与其入侵性的关系,并为其替代控制提供依据。紫茎泽兰叶片提取液对10种受体植物种子萌发和幼苗生长均有化感作用,不同浓度的提取液对植物的化感作用强度不同,低浓度时较弱,高浓度时较强。高浓度的提取液能降低种子发芽率、发芽速率、胚轴和胚根长度,增加幼苗丙二醛含量,其中发芽速率更敏感,可能是衡量化感作用的最敏感指标。不同植物对紫茎泽兰化感作用的敏感程度不同,无芒虎尾草、白三叶、细叶苦荬和莎草砖子苗对紫茎泽兰化感作用较敏感,紫花苜蓿最不敏感。

关 键 词:紫茎泽兰  化感作用  种子萌发  幼苗生长  入侵性
文章编号:1000-0933(2005)10-2782-06
收稿时间:2004-07-04
修稿时间:2004-07-042005-01-14

Allelopathic effects of Eupatorium adenophorum Spreng.on seed germination and seedling growth in ten herbaceous species
ZHENG Li and FENG Yulong. Allelopathic effects of Eupatorium adenophorum Spreng.on seed germination and seedling growth in ten herbaceous species[J]. Acta Ecologica Sinica, 2005, 25(10): 2782-2787
Authors:ZHENG Li and FENG Yulong
Affiliation:1. Kunming Division, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China ; 2. Graduate School, Chinese Academy of Sciences, Beijin g 100049, China
Abstract:It was hypothesized that allelopathy played an important role in biological invasion.Eupatorium adenophorum Spreng.has allelochemicals,which could inhibit seed germination of some species,such as pea,sensitive to allelochemicals.But we knew little about the effect of E.adenopherum's allelochemicals on species competing directly with it during the early stage of its invasion.Furthermore,the relationship between allelopathy and invasiveness was not known in E.adenopherum.In this study we determined the effects of aqueous leaf extract of E.adenopherum on seed germination and seedling growth in five herbaceous species competing directly with it during the early stage of its invasion, and five pasture species introduced to replace E.adenopherum.We discussed the relationships between allelopathy and invasiveness,replacement control of E.adenopherum.The aqueous leaf extract of E.adenopherum could inhibit seed germination and seedling growth in all the ten species,and its effect was concentration dependent,increasing with the increase of concentration.The high concentration extract could reduce seed germination rate and germination speed,radicle and hypocotyl growth,seedling dry mass,and increase malondialdehyde content.Seed germination speed was more sensitive to the extract than seed germination rate,which might be the most sensitive index to judge allelopathy,among parameters mentioned above.Sensitivity to the leaf extract was different among the species tested in this study,Chloris gayana,Trifolium repens,Ixeridium gracile and Mariscus cyperinus were sensitive to E.adenopherum's allelochemicals,but Medicago sativa was not.
Keywords:Eupatorium adenophorum Spreng.  allelopathy  seed germination  seedling growth  invasiveness
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