摘要
［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。
[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 conditions during the outbreak period of beet webworm adult greatly affected the spatial distribution pattern of subsequent larvae outbreak population. Beet webworm adults were mainly distributed within the areas with relative humidity between 60%-80%, and temperature was the main factor determining the spatial distribution pattern beet webworm adults and larvae within this area. The beet webworm adults were mainly distributed in the areas with a temperature higher than 21 ℃, and the adult population was relatively low when the temperature was over 27 ℃. Larvae outbreak happened within areas with a temperature between 19-27 ℃ during the outbreak period of beet webworm adult, and more severe outbreaks occurred when the temperature was between 21-25 ℃, which was the most suitable temperature range for adult oviposition.[Conclusion] The environmental temperature and relative humidity should be taken as important parameters in forecasting the spatial distribution of outbreak population of beet webworm on macro scale.
出处
《植物保护》
CAS
CSCD
北大核心
2011年第4期76-81,共6页
Plant Protection
基金
国家攻关专题(2005BA529A03,2005BA529A04)
中央财政国家重点实验室自主研究课题专项(SKL2009SR02)
关键词
草地螟
大发生
预测预报
空间分布
Loxostege sticticalis
outbreak
forecasting
spatial distribution
