葎草水浸提物对外来入侵植物喜旱莲子草营养生长的影响

Effect of Humulus scandens Water Extracts on Vegetative Growth of Invasive Alien Species,Alternanthera philoxeroides

利用葎草地上和地下部分的水浸提物,对喜旱莲子草根茎的营养生长进行了室内生物测定,分析其形态和相应化感强度,以明确葎草对入侵植物喜旱莲子草营养生长的影响作用。结果表明:(1)与葎草地上部分相比,葎草地下部分浸提物对喜旱莲子草的化感抑制强度更明显。(2)葎草地下部分能够明显抑制喜旱莲子草的叶片大小,0.1mg/L浓度下能比对照组显著减少40.21%。(3)葎草地上部分和地下部分浸提物对喜旱莲子草无性系小株枝条的节数无明显影响,但是浸提物对其根茎的分蘖力均具有明显抑制作用。(4)与葎草地上部分相比,其地下部分浸提物能较强抑制喜旱莲子草无性系小株高度。研究发现,葎草水提物能有效抑制喜旱莲子草的营养生长,有可能作为生物替代材料对喜旱莲子草进行替代控制。

Alternanthera philorerroides （Mart.） Griseb. is one of the most notorious invasive weeds and has been introduced to the regions with warm to subtropical humid climates worldwide. We tested bioassay in laboratory to ascertain the effect of Hurnulus scandens flour. ） Merr. on vegative growth and allelopathic potential of the invasive species. In this study,the effect on the invasive species is determined by water extract of different organs （belowground and aboveground organs） from H. scandens plants. The main purpose of this study was to find the relationship between H. scandens and A. philoaceroidess replacement control. The results as follow ： （1） Compared with the extract of aboveground organs, the inhibition of allelopathy from belowground organs was stronger than that from aboveground parts at the same concentration. （2）The organs of H. scandens has different function on the leaf area of host plants and the leaf area were reduced to 40.21% ,when the rhizome of host plants were applied the extract from the underground organs of H. scandens. （3）The extracts of different organs had little inhibitory effect on the node number of rarnets,however, the extracts significantly inhabited the number of ramets which was 25 % lower than the contrasts. （4）The water extracts from belowground organs inhabited ramets length of the invasive species. The present study suggests that H. scandens could be used as biological alternative material to manage A.philoxeroides invasion.