镇江市焦北滩翻耕种植灭螺效果及费用-效益评价

Effect and cost-benefit of Oncomelania snail control by plowing and planting in Jiaobei Beach of Zhenjiang City

目的观察镇江市焦北滩翻耕种植灭螺效果,评价其费用效益。方法于2009年在焦北滩东实验区实施修筑矮围、翻耕种植(矮围垦种)灭螺,在焦北滩西对照区采用氯硝柳胺乙醇胺盐粉剂进行喷粉法灭螺,观察两组灭螺效果,并进行费用效果比较。结果实验组矮围垦种当年活螺密度下降了99.75%,第2年开始即查不到活螺;对照区实施药物灭螺后当年活螺密度下降70%左右,但次年即基本恢复。实验区单位面积净效益费用比为2.18,对照区为-0.92。结论长江中下游江滩采用修筑江滩矮围和翻耕种植的方法可有效控制钉螺,并可取得一定的经济效益。

Objective To evaluate the effect and cost-benefit of Oncomelania snail control by plowing and planting in Jiaobei Beach of Zhenjiang City. Methods In 2009, the measures of building low dike and plowing and planting were implemented in the experimental area of the east part of Jiaobei Beach, while in the control area of the west part of the beach, the molluscacide （ni- closamide） was used to control snails. Then, the snail control effects and the cost-benefits of the two groups were compared. Re-suits In the experimental area, the density of living snails decreased by 99.75% in the year when the measures were implement-ed, and no living snails were found from the second year. Though that the density of living snails in the control area decreased by 70% around, it aroused again in the second year. The net cost-benefit ratios of the experimental area and the control area were 2.18 and -0.92, respectively. Conclusion Building low dike and plowing and planting in the beaches along the middle and lower reaches of the Yangtze River can effectively control snails, meanwhile, it is economic.