2019年-2020年昭通市草地贪夜蛾扩散时空格局

Spatiotemporal pattern of Spodoptera frugiperda in Zhaotong city from 2019 to 2020

地处云贵川交界的云南省昭通市是入侵害虫草地贪夜蛾Spodoptera frugiperda北迁的重要通道之一,为明确草地贪夜蛾在昭通市的入侵动态,本文基于2019年-2020年昭通市草地贪夜蛾的发生情况统计数据,通过空间分析探讨草地贪夜蛾的时空格局。结果表明:1)草地贪夜蛾在昭通市11县(区)均有发生,整体为害程度偏轻,虫口密度西部大于东部;2)发生密度中心由西南向东北移动,2020年迁移进程快于2019年,东部的迁移进程快于西部;3)草地贪夜蛾在昭通发生的热点从西南向东北迁移,发生时间西部早于东部,发生热点数量由西南向东北递减。本研究明确了昭通市草地贪夜蛾的发生密度中心、热点区域、海拔区间等时空动态特征,以期为草地贪夜蛾的监测预警及科学防控提供科学支撑。

Zhaotong city,Yunnan province,located at the junction of Yunnan,Guizhou and Sichuan,is one of the important passages for the northward migration of the invasive pest Spodoptera frugiperda.Based on the statistical data of the occurrence of S.frugiperda in Zhaotong city from 2019 to 2020,this study explored the temporal and spatial patterns of S.frugiperda through spatial analysis.The results showed that:1)S.frugiperda occurred in 11 counties(districts)in Zhaotong city,and the overall damage was slight.The insect population density in the west was greater than that in the east.2)The occurrence density center moved from southwest to northeast,and the migration process was faster in 2020 than in 2019,and the migration process in the east was faster than in the west.3)The occurrence hotspot of S.frugiperda in Zhaotong migrated from the southwest to the northeast.The occurrence time was earlier in the west than in the east,and the number of hotspots decreased from the southwest to the northeast.This study clarified the temporal and spatial dynamic characteristics of the occurrence density center,hotspot area,and altitude interval of S.frugiperda in Zhaotong city,which provides a scientific support for the monitoring,early warning,scientific prevention and control of S.frugiperda.