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目的 探讨人工灌溉与钉螺生长繁殖及感染性钉螺产生之间的关系。方法 选择安徽省宿松县钓鱼台水库一段干渠为观察点 ,每月下旬进行系统抽样查螺 ,连续观察 12个月 ;每次随机抽样有螺框 2 0框 (每框 0 .1m2 ) ,室内逐只测量钉螺螺旋数和壳体长度 ,并在镜下观察雌螺含卵情况 ;全部钉螺解剖鉴定死活及血吸虫感染情况。同时测量记录查螺环境气象、水文情况。结果 干渠活螺密度在水库放水灌溉前后各出现一次高峰 ,在放水灌溉末期钉螺死亡率最低 ,钉螺长速明显 ;雌螺含卵呈现明显的季节性变化 ,含卵雌螺数从 5月底开始减少 ,至 8月底仅占观察雌螺数 4 .82 % ,9月底又复增加 ;钉螺感染率及感染性钉螺密度在灌溉季节后较灌溉季节前上升。结论 人工灌溉能促进干渠钉螺的新老交替 ,促进年度感染性钉螺的发生
Objective To investigate the relationship between artificial irrigation and snail growth and infestation. Methods The first section of Diaoyutai reservoir in Susong County, Anhui Province was chosen as the observation point. The system was sampled every other month for 12 months. Each time a random sample was taken with 20 frames (0. 1m 2 per frame) Only the number of spiral snails and shell length were measured, and the oviposition of female snails was observed under the microscope. All snails were anatomized to determine the life and death and schistosomiasis infection. Meteorological and hydrological conditions are recorded and recorded at the same time. Results The results showed that the live lobed density of the main channel appeared a peak before and after irrigation in the reservoir. The mortality of snails was the lowest at the end of the drainage irrigation, and the long-term speed of snails was obvious. The oviposition of the female snails showed seasonal changes obviously. , Accounting for only 4.82% of the observed female snails by the end of August, increasing again at the end of September. The infection rates of snails and infectious snails increased after irrigation season before the irrigation season. Conclusion Artificial irrigation can promote the alternation of new and old canopies and promote the occurrence of annual infectious snails