中文摘要：

紫茎泽兰 （Ａｇｅｒａｔｉｎａａｄｅｎｏｐｈｏｒａ）是一种世界性的恶性杂草，现已在我国西南地区泛滥成灾，探索有效的防治措施极为迫切。以往研究表明桉树 （Ｅｕｃａｌｙｐｔｕｓｓｐｐ．）的化学成分具有多种生物活性和广泛应用前景。为了探索桉树的化学成分对紫茎泽兰种子萌发和幼苗生长的影响，本文采用室内生物模拟的方法，研究了桉树的 ５种重要化学成分即 １，８－桉叶油素、α－蒎烯、α－松油醇、柠檬烯和龙脑对紫茎泽兰种子萌发和幼苗生长的影响。结果表明：试验所用 ５种化学成分在 １０，５０，１００ｍｇ／Ｌ时对紫茎泽兰种子萌发和幼苗生长的综合作用均表现为抑制作用，综合效应指数介于 －００４～－０９６。其中，α－松油醇各浓度溶液对紫茎泽兰萌发和生长各参数的抑制作用最为显著，导致受体种子发芽率极低及萌发种子胚根、胚轴生长停止直至最后死亡，综合效应指数的绝对值达到 ０９５以上；１，８－桉叶油素、α－蒎烯、龙脑对紫茎泽兰萌发和生长参数的抑制作用随浓度增高而增强；柠檬烯在 ５０ｍｇ／Ｌ时抑制作用较弱，在 １０，１００ｍｇ／Ｌ时抑制作用较强。表明桉树的５种化学成分对紫茎泽兰的种子萌发和幼苗生长均具有一定的抑制作用。该研究有望为紫茎泽兰的防治和植物源农药的开发提供新的思路。

英文摘要：

Ageratina adenophora is a worldwide weed which leads to serious harm in Southwest China. It has been an urgent demand to be controlled. Previous studies have shown that chemical compositions from Eucalyputs spp. have various biological activities and broad application prospects. To explore the effects of five important chemical compositions from Eucalyptus spp. on seed germination and seeding growth of A. adenophora, the effects of five main chemical compositions from Eucalyputs spp. as 1, 8 - Cineole, A - Pi-nene, tx -Terpineol, Limonene and Borneo on germination and growth of A. adenophora were studied by u- sing indoor biological simulation experiment in this study. The results showed that seed germination and seeding growth of A. adenophora were inhibited comprehensively by the five chemical compositions at 10, 50, 100 mg/L concentration, and the synthetical allelopathic effect index ranged from -0. 04 to -0. 96. Among those, the inhibitory effects of a - Terpineol solution at different concentration were the most signifi- cant, which led receptor seeds to extremely low germination rate, seedling radicles and hypocotyls to cease growing and even die. Absolute value of comprehensive index of c~ - Terpineol reached over 0. 95. The in- hibitory actions of 1, 8 - Cineole, ~ - Pinene and Borneol on seed germination and seedling growth of A. adenophora enhanced with the concentration increased. The inhibitory effects of Limonene were weak at 50 mg/L concentration and strong at 10 mg/L and 100 mg/L concentration. The results above indicated that the five chemical compositions from Eucalyptus spp. inhibited seed germination and seeding growth of A. adenophora. The studies are expected to provide a new solution to prevention and control of A. adenophora and also a new development approach of plant-derived pesticides.