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目的为了解长丘山试区沟渠钉螺分布特点。方法用全球定位系统测试沟渠的坐标,经地理信息系统软件绘制沟渠分布图,采用系统抽样法,框距10 m(每框=0.11m2),检获的钉螺压碎镜检,检查钉螺的感染情况,并计数感染性钉螺体内尾蚴数。结果2003-2004年分别在8个、10个自然村的沟渠查螺,共调查8 387框,检查钉螺21 965只,查出感染性钉螺6只,平均活螺密度为2.61只/框。钉螺感染率0.027%,感染性钉螺密度0.000 72只/框。眉山市东坡区正山口乡沟渠的有螺框出现率显著高于蒲江县长丘乡的沟渠38.32%与30.69%,(2χ=41.52,P<0.01)。土沟中的钉螺占全部钉螺的85.07%,有草沟中的钉螺占全部钉螺的99.94%。平均1只感染性钉螺含尾蚴1 596条。结论长丘山试区钉螺和感染性钉螺主要分布在有草的土沟中。
Objective To understand the distribution of Oncomelania snail distribution in Changqiu Mountain. Methods The coordinates of ditches were measured by GPS, and the distribution of ditches was plotted by Geographic Information System software. The sampling distance was 10 m (frame = 0.11 m 2), and the snail was seized to check the infection of snails , And counted the number of infected cercariae in the body. Results In 2003-2004, 8 387 boxes were examined in the ditches of 8 villages and 10 villages respectively. 21 965 snails were detected, and 6 infectious snails were found, with an average live lobe density of 2.61 per box. Snail infection rate 0.027%, infective snail density of 0.00072 / box. The occurrence rate of screw-frame in the ditch of Zhengshankoukou Township in Dongpo District of Meishan City was significantly higher than that of the ditch of Changqiu Township in Pujiang County by 38.32% and 30.69%, respectively (2χ = 41.52, P <0.01). The snails in the soil ditch account for 85.07% of all snails, and the snails in the grass grove account for 99.94% of all snails. An average of only 1 infectious snail containing cercariae 1 596. Conclusion The snails and infecting snails in Changqiu Mountain are mainly distributed in grassy soil ditch.