摘要
瓜蚜AphisgossypiiGlover在温室黄瓜上的空间格局为聚集分布,分布的基本成分为个体群,聚集强度随密度的上升而下降;瓜蚜主要分布于中部和下部叶片。瓜蚜在温室黄瓜上呈指数增长,模型为Nt=0.1745e0.7414t(r=0.9676)。应用最优分割法将瓜蚜种群动态划分为3个阶段:初建期、发展期和高峰期。在种群初建期,有翅蚜开始迁入,数量较低,以扩散为主,分布不均匀,聚集强度较高;在发展期,瓜蚜种群不断繁殖扩散,分布日趋均匀,聚集强度逐渐下降;在高峰期,瓜蚜种群数量急剧增长到最高峰,分布至所有植株,聚集强度继续下降,此阶段后由于黄瓜植株受害枯萎,瓜蚜缺少食物而数量急剧下降。
The spatial patterns of Aphis gossypii Glover were aggregated in cucumber plants in the plastic greenhouse. The basic components of aggregation were colonies. The aggregation intensity declined with the increase of the population density. The aphids distributed mainly on the middle and lower leaves. The aphid population increased following the exponential model： Nt = 0.1745e^0.7414t（ r = 0.9676^＊＊）. Using the best division method, the population dynamics was divided into three periods. In the early establishment period, the alates began to immigrate into the greenhouse and diffuse among the plants. The population density was lower and the aggregation intensity was high during this period. In the developmental period, the aphids reproduced and diffused constantly. They tended to distribute evenly and the aggregation intensity decreased gradually. In the fastigium, the population increased sharply to the highest and distributed all over the plants, and the aggregation continued to decrease. Since then, the population declined rapidly due to the wihy of cucumber plants caused by the injury of aphids.
出处
《昆虫知识》
CSCD
北大核心
2005年第5期515-518,共4页
Entomological Knowledge
