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目的 查明平垸行洪、退田还湖(双退)堤垸钉螺扩散情况并了解其规律。方法 对4 1个双退废弃堤垸采取系统抽样结合环境抽查法设线设框进行现场调查。结果 4 1个平退垸中,发现9个垸内有钉螺分布,钉螺分布面积10 79.74 hm2 ,较平退前2 10 .34hm2 增加了86 9.4 hm2 ,为平退前的5 .13倍;受长江水系影响的平退废垸钉螺扩散速度快,省内入湖水系平退废垸尚未发现钉螺扩散。结论 洞庭湖区部分平垸行洪、退田还湖堤垸钉螺正在以较快的速度扩散。
Aim To find out the diffusion of snail in Pingdi embankment and the return of farmland to lake (double retreat) and understand the law. Methods A total of 4 1 double-abandoned abandoned embankments were systematically surveyed by systematic sampling combined with environmental sampling method. Results 4 1 flat back embankment found snail distribution in nine embankments, snail distribution area of 10 79.74 hm2, compared with 2 10 .34 hm2 flat before the return of an increase of 86 9.4 hm2, before retreating to 5 .13 times; by Affected by the Yangtze River water level retreat waste snail snail diffusion speed, the province into the lake water flat retirement embankment has not yet found snail spread. Conclusion Some of Dongting Lake area embankments flood, retreat paddy embankment embankment is spreading at a faster rate.