叶片打孔和植株剪除对紫茎泽兰根系3种化感物质含量的影响

采用营养液培育法,研究了叶片不同密度打孔和植株不同程度剪除对紫茎泽兰根系3种主要化感物质邻苯二甲酸(2-乙基)己酯(DEHP)、邻苯二甲酸二丁酯(DBP)、和泽兰二酮(DTD)]含量的影响.结果表明:打孔和剪株处理显著增加了紫茎泽兰根系分泌物种DBP和DTD的含量,其中在最高打孔密度6孔/叶时,DBP和DTD的含量均比对照增加了2倍以上;地上部分全部剪除后,DBP分泌量比对照增加了253.6％.两种处理都不同程度地降低了紫茎泽兰根系内部3种化感物质的含量,其中DTD含量与对照差异最为显著.

Effects of leaves holing and plants cutting on contents of three allelochemicals in roots of Ageratina adenophora

With the method of nutrient solution cultivation, effects of leaves holing and plants cutting at different level on the contents of main three allelochemicals (DEHP, DBP, and DTD) in roots of Ageratina adenophora were investigated. The results showed that, leaves holing and plants cutting increased the contents of DBP and DTD from exudates of A . adenophora significantly, among which the contents of DBP and DTD treated by leaves holing at the highest density of 6 hole/leaf increased by more than 2 times than that of control; the treatment of plants aboveground part all cut off caused a obvious enhancement of DBP by 253.6% than that of control. Both of the leaves holing and plants cutting decreased the contents of three allelochemicals in roots of A. adenophora in different degree, and the content of DTD attained the most significant varition compared with control.