作　　者： ; ; ; ; ;

机构地区： 韩山师范学院生物系

出　　处： 《中国生态农业学报》 2008年第6期1483-1488,共6页

摘　　要： 为探讨当归(Angelica sinensis)自毒作用与连作障碍的关系并建立合理的轮作制度,利用4个浓度当归营养期根部及茎叶部水浸液对当归及其种植区常见作物油菜(Brassica campestris)、小麦(Triticum aestivum)和燕麦(Avena sativa)的种子和幼苗进行了生物测定。分析结果表明,当归具明显的自毒作用(敏感指数M3=-0.258 3),茎叶部分的自毒效应强于根部,且作用强度随浓度增加而增强;小麦和燕麦对当归的化感作用有一定的耐受能力,综合敏感指数(M)分别为-0.075 5和-0.144 7;而油菜对当归的化感作用较为敏感,综合敏感指数为-0.307 9,这一结果与实际种植情况不符,推断可能与当归化感物质在土壤中的转化导致化感作用降低有关。在种间化感作用的研究中发现根部的化感作用强于茎叶,并有高抑制低促进的浓度效应。试验结果说明当归的自毒作用是造成连作障碍的原因之一;当归对小麦和燕麦的化感作用较弱,可以用于当归轮作体系,缓解因自毒作用而引起的连作障碍。 To investigate the relationship between autotoxicity and continuous cropping obstacle and to find a reasonable crop rotation system for Angelica sinensis（a common traditional Chinese medicinal plant）.Aqueous extracts from root,stem and leaf of A.sinensis at vegetative stage were analyzed for autotoxicity and allelopathic effect on Brassica campestris,Triticum aestivum,Avena sativa（which are often grown in regions where A.sinensis grown）.The results indicate that A.sinensis exhibits significant autotoxicity（sensitivity index M3 =-0.258 3）.The effect from stem and leaf extracts is stronger than root extracts,which also increases with increasing concentration.T.aestivum and A.sativa show resistance to A.sinensis allelopathy,with respective comprehensive sensitivity indexes（M） of-0.075 5 and-0.144 7,while B.campestris is sensitive at M3 =-0.307 9.Bioassay result of B.campestris is inconsistent with practical planting and this may be due to interactions between allelochemicals and soil microbes or allelochemical transformation which reduces allelopathy potential.Being different from autotoxicity,allelopathic effect of A.sinensis root on the three other tested plants is stronger than stem and leaf extracts,and is positively correlated with extract concentration.It then can be concluded that autotoxicity is an obstacle to continuous cropping of A.sinensis cultivation;T.aestivum and A.sativa may be an alternative rotation for overcoming this obstacle.

关 键 词： 当归 营养期 水浸液 化感作用 自毒作用 连作障碍 轮作

领　　域： [生物学]