白僵菌生物防治林中虫生真菌群落结构分析

对白僵菌生物防治林中虫生真菌群落的结构研究表明,长期接种式释放白僵菌的马尾松林中虫生真菌共有4属7种.球孢白僵菌的数量占绝对优势，为总数的63.22%；拟青霉次之，占25.86%；绿僵菌占9.20%；轮枝孢仅占1.72%.从寄主昆虫的多样性来看，球孢白僵菌和环链拟青霉的Brillouin多样性指数分别为3.564和2.315，均匀度分别为0.814和0.865；粉拟青霉和蜡蚧轮枝孢的多样性指数分别为1.471和0.862，均匀度为0.963和1.000而黄绿绿僵菌、金龟子绿僵菌和玫烟色拟青霉多样性和均匀度指标均较低.不同季节中被白僵菌侵染的寄主昆虫多样性指数呈现出春秋高、夏季低的趋势，反映了白僵菌种群的季节性变化.

Community structure of entomogenous fungi in Beauveria-inoculated Masson's pine forest

The study on the community structure of entomogenous fungi in a Masson's pine forest having been inoculated with Beauveria bassiana for many years showed that there were 4 genus and 7 species of entomogenous fungi,among which,B.bassiana was the dominant species,occupying 63.22% of the total,followed by Paecilomyces (25.86%),Metarhizium (9.20%) and Verticillum (1.72%).In terms of insect host diversity,the Brillouin index and evenness index were 3.564 and 2.315,and 0.814 and 0.865 for B.bassiana and P.cateniannulatus,and 1.471 and 0.862,and 0.963 and 1.000 for P.farinosus and V.lecanii,respectively,while M.flavoviride,M.anisopliae,and P.fumosoroseus had lower diversity and evenness.The diversity index of insect hosts infected by B.bassiana showed a temporal variation,i.e.,higher in spring and autumn,and lower in summer,which reflected the seasonal dynamics of B.bassiana population.