电灌站中层抽水阻止钉螺扩散的效果评估

Evaluation of Effect Prevention of Oncomelania Snail Spread by Pumping Water from Middle of Water Body in Electric Pumping Station

目的评估电灌站中层抽水阻止钉螺扩散的效果。方法在电灌站水泵处建造混凝土结构的抽水池。水线下1.2m处埋设涵管。在水体漂浮物和水泵出水口处查找钉螺。在灌溉区内开展查螺,其结果与对照区进行比较。结果试验和对照电灌站水体漂浮物均发现有钉螺。然而,试验电灌站水泵出水口处连续5年未截获钉螺,其灌溉区连续八年未查到钉螺。而对照电灌站及其灌溉区则连年查到钉螺。结论中层抽水可有效地阻止钉螺扩散。

OBJECTIVE To evaluate the effect of prevention of oncomelania snail spread by pumping water from middle water body in electric pumping station. METHODS The pumping pool of concrete structure custruct in water pump of electric pumping station. The culvert pipelinet laid on below waterline 1.2m. The snail were detected in floats of river and in the exit of water pump.The snail investigation was carried out in irrigation areas and the results were compared between the study area and the control area. RESULTS The snails were discovered in floats of river of trial and control electric pumping station. However, there were continuously no any snails in exit of water pump in trial electric pumping station in 5 years and continuously no any snails in the irrigation areas in 8 years, either. There were snails in the control areas. CONCLUSION The pumping water from middle of water body is very effective for prevention of oncomelania snail spread.