Study on Community Structure and Dynamics of Insects, Spiders and Entomogenous Fungi in Masson′s Pine Stands in Winter in the Southern Part of Anhui Province

During winter,the community structure and the dynamics of insects spiders and entomogenous fungi were investigated vertically from November,1992 to January,1993.The results showed that species numbers were in order:phytophagous groupspider groupparasitic grouppredatory groupentomogenous fungi.The individual numbers were in the order:phytophagous groupparasitic groupspiderspredatory groupinfected insect cadavers.The species number of phytophagous group accounted for 46.35% of the total species number.The individual number of phytophagous group accounted for 83.65% of the total individual number.The ratio of beneficial to pest organism species numbers was 1.16671 ,and the ratio of the beneficial to pest individual number was 0.19541.Within the tree layer,species numbers were the highest.The individual number in this layer accounted for 52.1% of the total individual number.In the soil layer ,species number and individual number were respectively the second,and the individual number accounted for 41.6% of the total individual number.The species and the individual number were all scarce in the dead soil covering layer,the shrub and herb layer.The entomogenous fungi were mainly distributed in the dead soil covering layer,tree layer and soil layer.The total individual number in November was bigger,that in December was the smallest and that in January was the biggest.It is helpful to enhance the overwintering incidence of the disease for the population of Dendrolimus punctatus .