立地条件和人为干扰对杜仲梦尼夜蛾种群数量的影响

在河南省灵宝市两处种植模式和管理措施截然不同的杜仲种植基地,以杜仲梦尼夜蛾为研究对象,采用回归分析和T检验方法,研究立地条件、林分特征和人为干扰因素对杜仲梦尼夜蛾种群数量的影响。结果表明:在不同栽培和管理措施条件下,影响杜仲梦尼夜蛾种群密度的主要因素是坡向和海拔高度,虫口密度均随着坡向值的增加和海拔的增高而降低。人为干扰较少的庄科基地的林分郁闭度成为继坡向及海拔后影响虫口密度最重要的因素,这一点是两种管理模式下的最大的区别。闫驮基地7月份的叶面积损失率与5月的差异不显著(F=1.005,P=0.317),但极显著低于同期庄科基地的叶面积损失率(F=33.268,P0.001),表明闫驮基地采取的以抚育管理为主的生态调控措施在控制杜仲梦尼夜蛾种群密度方面取得了良好的效果。本研究结论可用于指导划分关键防控区域和以抚育管理为主的杜仲梦尼夜蛾生态调控技术的实施。

Impact of site condition and anthropogenic disturbance on Orthosia songi Chen et Zhang population

In order to better understand the effects of site conditons, stand features and anthropogenic disturbance on population distribution and dynamic of Orthosia songi, we carried out the studies in two Eucommia ulmoides plantation bases under different planting modes and management stratigies located in Lingbao City, Henan, China. A regression analysis was applied for analyzing the relationship between O. songi larval density and site conditions and stand features in Eucommia orchard-system base in Yantuo and Eucommia plantation base in Zhuangke, respectively. A t-test was used to compare O. songi larval density in the same base and between the two bases investigated in May and in July, respectively. Results indicated that aspect value and elevation were consistently the most important predictor variable negatively correlated with larval density in the two bases. Canopy cover was the most important variables among stand features affecting larval density in Zhuangke base, which was different compared to Yantuo base. There was no significant difference of leaf area loss rate in Yantuo base between in July and in May ( F=1. 005 , P=0. 317 ) , while the July’s leaf area loss rate in Yantuo was statistically significant lower compared to that of the same time in Zhuangke base ( F=33. 268 , P<0. 001 ) . It suggested the positive effect of ecological regulation approaches on controling O. songi population density in Yantuo base. Our findings can be used to determine those key areas for O. songi monitoring and control as well as implementation of ecological regulation techniques based on tending measures.