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目的 探讨鄱阳湖北部湖汊型草洲植被的覆盖度和钉螺的生长发育、钉螺血吸虫感染性年间变异的关系。方法 选定都昌县 6个草洲连续 3年进行植被覆盖度和螺情调查 ,对所获钉螺进行测量、解剖 ,并收集水文资料进行比较分析。结果 13- 16 m高程的草洲 ,水淹日数越长 ,植被的覆盖度越低 ;同一草洲不同年间钉螺的生长发育与植被的覆盖度呈正相关 ;不同草洲不同年间钉螺血吸虫感染率以钉螺壳长 7.5 m m以上为最高 ,5 .5 - 7.5 mm为其次 ,5 .5 m m以下最低 ;草洲钉螺血吸虫感染性年间变异与植被的覆盖度无关 ,而与传染源的多少和管理措施的力度有关。结论 草洲水淹日数与植被的覆盖度呈负相关 ,钉螺壳长与植被的覆盖度呈正相关 ,感染性钉螺其壳长者感染率较高 ,钉螺血吸虫的感染率与植被的覆盖度无关。
Objective To investigate the relationship between the coverage of larvae of Spartina alterniflora and the growth and development of Oncomelania snails and the annual variation of infection of Schistosoma japonicum in Poyang Lake. Methods Six grasslands in Duchang County were selected for investigation of vegetation cover and snail for three consecutive years. The snails obtained were measured and dissected, and the hydrological data were collected for comparative analysis. Results The grassland with 13-16 m elevation had longer flooding days and lower vegetation coverage. The growth and development of snails in different years were positively correlated with the coverage of vegetation. In different years, the infection rates of snails The length of the snail shell was the highest at 7.5 mm, followed by the range of 5.5 - 7.5 mm, and the lowest at 5.5 mm. The annual variation of infectivity of the snails was independent of the coverage of the vegetation, but the difference with the source of infection and the management measures Intensity related. Conclusion The number of days of flooding in grassland is negatively correlated with the coverage of vegetation. The length of snail shells is positively correlated with the coverage of vegetation. The infection rate of infected snails is high. The infection rate of schistosomula is not related to vegetation coverage.