外来入侵杂草空心莲子草与本土杂草莲子草的化感作用潜力比较  

Comparison of Allelopathy Potential Between an Exotic Invasive Weed Alternanthera philoxeroides and a Local Weed A. sessilis

作　　者：余柳青[1] Yoshiharu FUJII 周勇军[1] 张建萍[1] 陆永良[1] 玄松南[1] 

机构地区：[1]中国水稻研究所水稻生物学国家重点实验室,浙江杭州310006 [2]日本国立农业环境技术研究所

出　　处：《中国水稻科学》2007年第1期84-89,共6页Chinese Journal of Rice Science

基　　金：国家自然科学基金资助项目(30571231)。

摘　　要：为确定外来入侵杂草空心莲子草的化感作用潜力,以我国本土生长的莲子草为对照采用“三明治”生测法,测定了空心莲子草和莲子草及其不同器官对靶标莴苣和无芒稗根长和芽长的抑制率。结果表明,空心莲子草叶片处理对莴苣和无芒稗根长的抑制率分别为81%和51%,对莴苣和无芒稗芽长的抑制率分别为49%和48%,显著高于空白对照。但与莲子草相比,差异不显著。空心莲子草根系对莴苣的根长平均抑制率为54%,显著高于茎和叶片。随着样品用量增加,空心莲子草对莴苣根长的抑制率显著提高,其50mg叶片处理对莴苣根长的抑制率为83%,显著高于10mg处理的54%和30mg处理的61%。To estimate the allelopathy potential of Alternanthera philoxeroides, the inhibition rates of different organs of the exotic invasive weed A. philoxeroides on seedlings of lettuce （Lactuca sativa L. ） and barnyardgrass [Echinochloa crusgalli （L.） Beauv. var. mitis （Pursh） Peterm. ] were measured with a Chinese native weed A. sessilis as a control by the sandwich method. Under the treatment of 50 mg leaves ofA. philoxeroides, the root growth of the lettuce and barnyardgrass was inhibited by 81% and 51%, respectively, and for the shoot growth by 49% and 48%, respectively, significantly higher than the control. However, there were no significant difference compared with that of the treatment of A. sessilis. The inhibition rate on the root length of barnyardgrass was 54% on average under the treatment of the root of A. philoxeroides, much higher than that of the treatments of its stem and leaf. In addition, with the dose of sample of A. philoxeroides increasing, the inhibition rate against the root growth of lettuce enhanced significantly, and the values were 54 %, 61% and 83% under the treatments of 10 mg, 30 mg and 50 mg leaf of A. philoxeroides, respectively.

关 键 词：空心莲子草 莲子草 化感作用 入侵杂草 无芒稗 

分 类 号：S451[农业科学—植物保护] S476