土壤灭菌对紫茎泽兰和番茄的反馈作用

Feedback of Soil Sterilization on Ageratina adenophora and Lycopersicum esculentum

通过灭菌处理控制云南和北京2份土壤的土壤微生物,比较不同来源土壤的微生物群落对入侵恶性杂草紫茎泽兰和蔬菜番茄生长的反馈作用。结果表明:对于紫茎泽兰,2种土壤灭菌后均不利于其生长。北京菜园土灭菌后,紫茎泽兰的株高和生物量显著低于对照处理,其中生物量是对照处理的14.3%;云南紫茎泽兰入侵土壤灭菌后,株高和生物量分别为对照处理的58.1%和42.9%。而对于番茄,北京菜园土灭菌后,株高和生物量分别为对照处理的226.9%和644.5%;云南土中,灭菌后株高和生物量都与对照处理无显著差异,分别为对照的94.6%和88.7%。以上结果揭示,不同来源土壤灭菌处理后,对外来入侵杂草紫茎泽兰和蔬菜作物番茄的反馈作用存在差异。

Studies were conducted to compare the feedback of different sources of soil microbial community on the growth of noxious weeds Ageratina adenophora and tomatoes by sterilization of soil from Yunnan and Beijing.The results showed that the two types of soil were unfavorable for the growth of A.adenophora after sterilization.Specifically,for soil collected from a vegetable garden in Beijing,plant height and biomass of A.adenophora cultivated in sterilized soil were significantly lower than control.The plant biomass of A.adenophora was only 14.3% that of control.For soil collected from invaded area by A.adenophora in Yunnan,plant height and biomass of A.adenophora cultivated in sterilized soil were 58.1% and 42.9% that of control,respectively.However,plant height and biomass of tomato cultivated in soil from the vegetable garden after sterilization were 226.9% and 644.5% that of control,respectively.The plant height and biomass of tomato cultivated in soil from Yunnan after sterilization were 94.6% and 88.7% that of control respectively,which showed no significant differences.The findings suggested that for different sources of soil,their sterilization had different feedbacks for the growth of invasive weed A.adenophora and common vegetable crop tomato.