合溪水库血防工程对钉螺控制的效果评价

目的 目的 评价合溪水库血防工程对钉螺控制的效果。方法 方法 在水库库尾区、 消落带、 上游集雨区、 坝址及下游等，分别实施水渠硬化工程+主要水系拓宽+溢流坝工程、 填高复垦+库岸硬化护坡工程、 环境改造灭螺工程和综合治理。监测水库血防工程建设前后螺情消长情况， 分析该工程对合溪水库不同区域的钉螺控制效果。结果 结果 水库建成蓄水并采取血防工程措施后， 库底区、 坝址区域、 库区消落带、 库尾区及坝址下游等地原有钉螺全部消除， 已连续3年监测未发现钉螺； 上游集雨区钉螺密度由2009年的0.620 4只/0.1 m2降至2013年的0.113 2只/0.1 m2， 但钉螺面积下降不明显。结论 结论 合溪水库血防工程有效地防止了上游集雨区钉螺向库区扩散， 控制钉螺效果明显。

Effect of schistosomiasis control projects in Hexi Reservoir on Oncomelania snail control

Objective To evaluate the effect of schistosomiasis control projects in Hexi Reservoir on Oncomelania hupensis snail control. Methods The canal hardening ＋ main water system widening ＋ the overflow dam project, the concrete slope protec tion, the banking and reclamation ＋ concrete slope protection project, the environment reform project, and the comprehensive treatment were implemented in the tail area, the hydro-fluctuation belt, the rainwater harvesting zoon of the upstream area, the dam area, and the downstream area of the reservoir, respectively. The changes of the snail situation were investigated before and after the construction of the reservoir, and the snail control effects of the schistosomiasis control projects in different parts of the reservoir were analyzed. Results There were no Oncomelania snails found 3 years in the bottom area, dam area, hydro-fluctua tion belt, tail region and downstream of the dam after the construction and storage of the reservoir and the implementation of the schistosomiasis control projects. In the rainwater harvesting zoon of the upstream area, the density of living snails decreased from 0.620 4 snails/0,1 m^2 in 2009 to 0.113 2 snails/0.1 m^2 in 2013, but the snail area still remained. Conclusions The schistosomia sis control projects in Hexi Reservoir have effectively prevented the diffusion of Oncomelania snails from the rainwater harvesting zone of the upstream area to the dam area, and they are effective in the snail control.