嘉鱼县的长江洲滩多为江心芦洲。这种芦洲都有钉螺孳生,且钉螺分布面积不断扩大。我们选择7个江心洲(6个洲有芦,1个洲无芦),于1971、1976、1980及1982年的春季,测量面积,等距设框调查钉螺分布情况,结果如下: 一、江心芦洲高程增高情况:4年内6个江心芦洲的高程均有不同程度的增高。最低处的高程由 Jiayu County, the Yangtze River Island Beach mostly river heart Luzhou. This Luzhou has snail breeding, snail distribution and the area has been expanding. We chose seven Jiang Xinzhou (six continents have reed, one continent no reed), in the spring of 1971,1976,1980 and 1982, measuring area, equispaced box to investigate snail distribution, the results are as follows: Luzhou elevation increased situation: 4 years, six river heart Luzhou elevation have varying degrees of increase. The lowest elevation by