稻水象甲在浙江和福建省扩散的空间格局分析

应用地统计学方法和GIS技术分析了稻水象甲在浙江和福建省早稻上的空间分布和动态（1993-2001）。结果表明：稻水象甲主要分布于沿海一带,其空间分布格局在所有年份均表现为聚集分布,并且这种分布格局随时间发生变化。在1993年该虫入侵面积大约为392100公顷,在以后的几年中其面积随时间而持续增加,至2001年达最大,为2533900公顷。稻水象甲起初沿海岸线向南扩散,接着向北,现在该虫已入侵约26个县和190个乡镇。通常,该虫在南部的为害重于北部,玉环、乐清、温岭等地发生最重。稻水象甲主要沿公路和水路扩散,这表明该虫的传播为人类活动所致,因此其扩散速率可以通过对国家和地区间的交通货运进行严格的检疫而得到控制。

Spatial Pattern Analysis of Spread for the Rice Water Weevil in Zhejiang and Fujian Provinces, East China

Geostatistical methods and GIS are used to analyze the spatial dis- tribution of the rice water weevil (RWW) in the 1st rice crop season in Zhejiang and Fujian province from 1993 to 2001.The results show that the RWW population is mainly distributed in coastal regions,its spatial patterns are aggregated throughout the study periods and distribution patterns change with time.The area occupied by this pest is about 392,100 ha in 1993 which increase continually to a maximum of 2,533,900 ha in 2001.The RWW population initially spread south along the coastline, then north.It has now invaded about 26 counties including 190 villages and towns. In general,the risk to rice crops posed by the RWW population is higher in south and lower in north;it is highest in Yuhuan,Leqing and Wenling from 1993 to 2001. RWWs spread mostly along roads and waterways,which suggests that it is transported by human activity and therefore that its rate of spread may be controlled by better managing the transport of people and produce.