Key factors affecting the occurrence of Acantholyda posticalis larvae in Luoshan Mountains,Ningxia
[Objective]The objective is to study the relationship between the occurrence of Acantholyda posticalis larvae and stand and site factors,and screen out the key factors affecting the occurrence of A.posticalis larvae.[Method]21 sample plots were set up from 2022 to 2023 in the main occurrence areas of the larvae in Luoshan National Nature Reserve of Ningxia to investigate the larval population density of A.posticalis,stand factors and site factors.Using stepwise regression analysis,the key factors affecting the average population density of A.posticalis larvae were screened out.The relationship between mean population density and key factors was obtained by variance analysis and correlation analysis.[Result]By stepwise regression analysis,it was found that herb coverage,crown width,canopy density,and slope position were the key factors affecting A.posticalis larval occurrence.A linear prediction equation for the average larval population density was established based on the key factors.Among the 4 key factors selected,herb coverage and slope position inhibited the larval occurrence,while crown width and canopy density promoted the larval occurrence.[Conclusion]Larvae of A.posticalis are easy to occur in uphill forest areas with low herb coverage,high canopy density and crown width in the understory.It is suggested that these forest areas be taken as the key areas for prevention and control,and herb coverage be adjusted to above 0.3,crown width below 2.5 m and canopy density below 0.7,so as to realize the ecological control of the larval population of A.posticalis in this area.[Ch,5 fig.3 tab.39 ref.]
Acantholyda posticalisaverage population densityherb coveragecrown widthcanopy densityslope position
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