紫茎泽兰的化学互感潜力（英文）

广布于阑沧江流域的紫茎泽兰是一入浸性极强的外来杂草。研究表明它对其它植物有化学互感作用，其地上部分的石油醚、乙醇和水提取物对豌豆的种子萌发和幼苗生长均有抑制作用。在２％相对浓度下，紫茎泽兰的石油醚、乙醇和水提取物豆的萌发分别产生１００％、４０％和５０％的抑制。它的化学互感物质主要集中于石油醚提取物及醚提取物吸附于活性炭后的甲解剖 物中。从石油醚提取物分离出的第二，第三和第四组分继主要的活性成分，在

ALLELOPATHIC POTENTIAL OF EUPATORIUM ADENOPHORUM

Eupatorium adenophorum, a weed with strong invasibility and exotic to the Lancang River watershed, has an allelopathic effect on other plants. Its petroleum, ethanol and water extracts showed inhibitory effects on the germination and seedling growth of the garden pea (Pisum sativum). At the relative concentration of 2%, the petroleum, ethanol and water extracts showed 100%, 40% and 50% inhibition on pea germination respectively. Its allelochemicals are mainly located in petroleum extract and the methanol eluent of the petroleum extract absorbed in activated charcoal. The major active fractions of the petroleum extract are FR2 (identified as 9 Oxo Ageraphorone), FR3 and FR4. At the relative concentration of 1%, the FR2, FR3 and FR4 showed 100%, 90% and 90% inhibition on the germination of pea respectively. Moreover, germinated peas treated with 1% FR3 and FR4 did not show any shoot and root growth. It is suggested that the allelopathic effect of this plant occurs through the release of volatile allelochemicals from aerial part tissues and the leaching of water soluble allelochemicals from both aerial tissues and litter.