我国生物入侵形势严峻,其中菊科豚草(属一年生杂草豚草)造成的危害十分严重。已有研究证实,豚草的入侵机理之一是化感作用。但在北京地区对其机理的具体研究尚未见报道,并对其危害现状缺乏量化分析。考虑到豚草化感作用研究对北京农业的重要意义,确定本文在考察豚草在北京部分地区分布情况的基础上重点研究豚草对植物种子萌发、幼根发育的化感作用。 The situation of biological invasiveness in China is grave, and the damage caused by Compositae ragweed (an annual weed ragweed) is very serious. Studies have confirmed that one of the invading mechanisms of ragweed is allelopathy. However, the specific study of its mechanism in Beijing has not been reported yet, and there is no quantitative analysis of its harm status. Taking into account the importance of ragweed allelopathic effects in Beijing agriculture, it is determined that this paper focuses on the allelopathy of ragweed on seed germination and young root development based on the investigation of the distribution of ragweed in parts of Beijing.