Key factors affecting occurrence of Cephalcia infumata(Hymenoptera:Pamphiliidae)in Picea crassifolia forest in Daluoshan Mountain,Ningxia
This study aimed to identify the relationship between the occurrence of Cephalcia infumata Zhang &Wei and the stand characteristics and site conditions of Picea crassifolia forest,and explore the key factors affecting the population density of C.infumata,which has important guiding significance for monitoring the population density of C.infumata in P.crassifolia forest.A total of 16 plots(20 m× 20 m)were set up in different forest types in the main distribution area of C.infumata in Daluoshan Mountain,Ningxia,and the stand factors,site factors and population density of C.infumata were investigated.By stepwise regression analysis,herb coverage(x7),canopy(x2)and crown width(x5)were identified as the key factors affecting the occurrence of C.infumata from 2022 to 2023 and a linear prediction equation model of population density was established,y=-50.205-50.758x7+111.633x2+2.916x5.Among them,there was a negative correlation between herb coverage and average population density of C.infumata(P＜0.01,t=6.169),a significant positive correlation between canopy coverage and average population density of C.infumata(P＜0.01,t=3.345),and a significant positive correlation between crown width and average population density of C.infumata(P＜0.01,t=5.724).Therefore,C.infumata is prone to occur in P.crassifolia forest with large canopy and crown width and low herb coverage in Daluoshan Mountain,Ningxia,which should be a key monitoring area to prepare for prevention of insect pests in advance.
Picea crassifoliastand factorsite factorCephalcia infumatapopulation density
NETL
NSTL
万方数据
