我国2008年草地螟大发生种群空间分布特征

［目的］为进一步认识草地螟大发生规律，更好地开展大尺度草地螟发生预测预报，本文对2008年草地螟大发生种群空间分布特征进行分析。［方法］ 对2008年我国草地螟1代成虫和2代幼虫发生数量与当地温湿度条件进行回归分析，找出影响草地螟种群空间分布特征的主要因素。［结果］ 草地螟成虫发生期的环境温湿度对随后幼虫发生的空间分布具有显著的影响。草地螟成虫集中分布在湿度60%~80%的区域内，而在相对湿度为60%~80%的区域内，温度是草地螟成虫和幼虫空间分布的主导因素。成虫主要分布在温度高于21 ℃的区域内，而温度高于27 ℃的区域内草地螟成虫量较少。在成虫盛期温度为19~27 ℃的区域内易形成草地螟幼虫大发生，特别是在温度为21~25 ℃区域内发生程度更重，该温度范围与草地螟成虫产卵适温范围相符。［结论］ 成虫发生期的环境温湿度指标应是开展大尺度空间草地螟大发生分布预测预报的重要依据。

Characteristics of spatial distribution pattern of Loxostege sticticalis outbreak population in China in 2008

Objective] For the purpose of better understanding the outbreak dynamics,and improving the forecasting of beet webworm outbreak on macro scale,case analysis was conducted on beet webworm outbreak in 2008.Method] Regression analysis between the amount of the first generation adults and the second generation larvae in 2008 and the local temperature and humidity were made to find the factors affecting the spatial distribution of Loxostege sticticalis.Result] Environmental temperature and relative humidity c...