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目的 了解人工灌区钉螺扩散与水位之间关系。方法 在陈村水库灌区的引水总干渠内选择一处坡滩 ,每月系统抽样查螺 ;选择一典型涵闸 ,测量其进水口高、宽 ;勘测滩地及涵闸高程 ;收集总干渠内来水量及历年逐月水位情况 ;综合分析水位变化对钉螺扩散的影响。结果 干渠滩地淹水季节适宜钉螺孳生 ,螺情严重 ;干渠内钉螺分布在齐涵闸高 2～ 3 m水位的沿岸地带。干渠可以经涵闸对农田实施常年自流灌溉 ;水位齐涵闸高 2 m及以上时 ,自流灌溉易造成钉螺扩散。结论 钉螺在总干渠内由上游向下游扩散是肯定的 ,经涵闸向支渠及灌溉农田扩散是可能的 ,主要受水位变化影响。
Objective To understand the relationship between snail diffusion and water level in artificial irrigation area. Methods A slope was chosen in the main diversion channel of the Chencun reservoir irrigation area and the monthly sampling was conducted. A typical culvert was selected to measure its inlet height and width. The elevation of the beach and the culvert was surveyed. Monthly water level monthly situation; comprehensive analysis of water level changes snail spread. Results The flood season was suitable for snail breeding in the dry-flood beach land, and the snail was serious. The snail in the main canal was distributed along the coast of 2 ~ 3 m water level of Qi culvert. The main channel can carry out perennial gravity irrigation on the farmland through the culverts. When the water level reaches the culvert height of 2 m and above, the runoff can easily cause the snail to spread. Conclusion It is certain that snails spread from the upstream to the downstream in the main canal, and it is possible to spread to the branch canal and irrigated farmland through the culverts, which is mainly affected by the change of water level.