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紫茎泽兰根系释放的化感物质是导致其土壤环境发生变化的重要因素,可为其成功入侵提供有利条件.以空白土样为对照,提取健康和感染棉蚜的紫茎泽兰根区土壤酚酸类化感物质,采用GC-MS分析其组分和相对含量.结果表明:不同处理根区土壤酚酸类化感物质的种类没有变化,但相对含量发生了改变.其中,虫害处理土样中苯甲酸和对羟基苯甲酸的相对含量均显著高于对照,但对羟基肉桂酸的相对含量显著低于对照,且苯甲酸、对羟基苯甲酸和对羟基肉桂酸的相对含量在3种处理土样中的比例存在差异.用上述3种物质单体及它们在3个处理土样的比例复配进行抑菌试验发现:在较低浓度(50～150mg·mL-1)下,3种化感物质对5种土传性病菌有显著的抑制作用,但复配后对5种病菌的抑制作用各不相同,虫害处理的复配对其中3种病原菌的抑制作用均低于对照和健康植株.
The allelochemicals released from the roots of Eupatorium adenophorum were the important factors that led to the change of soil environment, which could provide favorable conditions for their successful invasion.With the blank soil samples as the control, Eupatorium adenophorum rooted in healthy and infected cotton aphids The soil phenolic acids allelochemicals were analyzed by GC-MS. The results showed that the content of phenolic acids allelochemicals did not change, but the relative content changed. Among them, The relative contents of benzoic acid and p-hydroxybenzoic acid in soil samples were significantly higher than the control, but the relative content of p-hydroxycinnamic acid was significantly lower than the control, and the relative content of benzoic acid, p-hydroxybenzoic acid and p-hydroxycinnamic acid was between 3 The results showed that there was a significant difference in the proportion of soil samples treated with the above three kinds of materials and their combination in three soil samples at a low concentration (50-150 mg · mL-1) The three allelopathic substances had significant inhibitory effects on five soil-borne pathogens, but the inhibitory effects on the five pathogens were different after compounding. The inhibitory effects of the pest treatment on three of the three pathogenic bacteria were lower than that of the control and Healthy plant.