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目的掌握句容市丘陵山区钉螺孳生和分布规律,为制定灭螺规划提供科学依据。方法按水系调查丘陵山区历史有螺环境和现有螺环境,并应用GPS现场采集历史有螺环境和现有螺环境的地理坐标数据,采用Google Earth技术定位分析钉螺孳生环境特点及分布规律。结果共调查历史有螺环境399个,历史有螺面积2 904.39 hm2。其中Ⅰ类环境33个,面积415.04 hm2;Ⅱ类环境33个,面积323.19 hm2;Ⅲ类环境11个,面积96.40 hm2;Ⅳ类环境318个,面积1 989.46 hm2。环境改造率达14.29%。Google Earth地图标注显示现有螺环境和历史有螺环境均沿水系聚集性分布。结论调查建立了句容市历史有螺环境数据库,并以Google Earth地图进行空间标注,有助于山丘地区钉螺监测和更好地制定灭螺规划。
Objective To understand the breeding and distribution of Oncomelania snails in mountainous area of Jurong City and provide a scientific basis for the formulation of snail control plan. Methods According to the investigation of the historical snail environment and the existing snail environment in the hilly and mountainous areas by the water system, the geospatial data of the historical snail environment and the existing snail environment were collected by using GPS and the characteristics and distribution of snail breeding environment were analyzed using Google Earth technology. Results A total of 399 snails were surveyed, with a history of 2 904.39 hm2. Among them, 33 were Type I environment with an area of 415.04 hm2; 33 were Type II environment with an area of 323.19 hm2; 11 were Type III environment with an area of 96.40 hm2; and 318 were Category IV environment with an area of 1 989.46 hm2. Environmental reform rate of 14.29%. Google Earth map annotations show that both existing and historical snails are clustered along the river system. Conclusion The investigation established the historical snail environment database of Jurong City and annotated the space with Google Earth map, which is helpful for the snail monitoring in the hill area and the better planning of snail control.