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目的 探讨混凝土护坡通江河道内钉螺迁移扩散规律 ,为制订钉螺防治对策提供依据。方法 以苏南运河“河口至新丰铁路桥”河段为试区 ,开展整治前已灭螺点、混凝土护坡有螺情况、水中障碍物滞螺、水体钉螺、漂浮物携螺和船体携螺调查 ,将调查结果与整治前情况相比较。结果 已灭螺点复查 12处 ,2处查到钉螺 ,距河口分别为 3.2 km和 4 .3km;水中障碍物滞螺调查有螺框出现率为 0 ,与整治前的 87.0 %相比 ,差异有非常显著性 (P<0 .0 1) ;调查水体 4 80 0 m3,捕获活钉螺1只 ,水体钉螺密度 0 .0 2 1只 /m3,较整治前下降了 98.5 % ;调查漂浮物 2 6 0 kg,捕获活钉螺 3只 ,漂浮物携螺量 0 .0 12只 /kg,较整治前下降了 95 .4 %。结论 混凝土护坡通江河道汛期仍存在钉螺迁移扩散 ,以随水流及漂浮物扩散为主要形式 ,但强度明显减弱 ,波及范围明显缩小
Objective To study the rule of migration and spread of Oncomelania snail in concrete revetments and to provide basis for the prevention and control of snail. Methods Taking the section of “the estuary to the Xinfeng railway bridge” of the southern Jiangsu Canal as the test area, the project started to carry out the measures of eliminating spiral spots before remediation, including the condition of slope protection for concrete revetments, hysteria, slugs, Survey, the survey results compared with the situation before remediation. Results Twelve snails were found in the review, and snails were found at two locations, with distances of 3.2 km and 4.3 km respectively from the estuaries. The incidence of stranded snails in the stranded snails was 0, compared with 87.0% before treatment (P <0.01). 4 80 0 m3 water bodies were surveyed, 1 snail alive and 0 0 0 2 1 / m3 snails, which decreased by 98.5% 6 0 kg, captured 3 live snails, floaters carried 0 0,12 kg / kg, which was 95.4% lower than that before treatment. CONCLUSIONS Oncomelania migration and diffusion still exist in flood season of Tongjiang River with concrete revetment, with the spread of water flow and floating debris as the main form, but the intensity is obviously weakened and the scope of the wave is obviously reduced