对低丘区6种土地利用类型的钉螺分布特征以及不同土地利用类型钉螺分布与草本特征的关系进行了调查研究。结果表明：（1）滩地杨树林地、旱地、河滩、荒地、沟渠、水田均有钉螺分布，而其他林地类型中并未发现钉螺，有螺框出现率与钉螺密度的大小规律一致，为河滩﹥沟渠﹥水田﹥旱地﹥荒地﹥滩地杨树林地；（2）最适于钉螺孳生的草本高度、盖度、物种丰富度分别为16～20 cm、80%～90%、6～7；（3）滩地杨树林地、旱地、河滩、荒地、沟渠的钉螺密度与草本高度分别呈现y =-0.0248x2+0.2209x - 0.2352、y =-0.1725x2 + 0.9595x -0.8075、y = - 0.0902x2+0.4055x+1.7143、y =-0.0667x2+0.4583x-0.0743、y = -0.2850x2+1.5490x-0.9550的关系，旱地、荒地的钉螺密度与草本盖度分别呈现y =-0.0950x2 + 0.3650x + 0.1550、y =-0.3350x2+1.9210x-1.7050的关系，滩地杨树林地、旱地、河滩、荒地、沟渠、水田的钉螺密度与草本物种丰富度分别呈现y =-0.0212x2+0.2057x- 0.1781、 y =-0.0581x2+0.4248x-0.3000、y =-0.4793x2+3.0607x-2.4560、y =-0.0436x2+0.2704x+0.2080、y =-0.0675x2+ 0.7788x- 0.9420、y = -0.1282x2+0.8186x-0.4240的关系。
The characteristics of snail distribution in six land use types, and the relationship between Oncomelania hupensis fausti Bartsch distribution and characteristics of herb in different land use types were investigated in the low hill area. The results were as follows. Firstly, snails were found in bottomland poplar forest land, dry land, beach, wasteland, irrigation canal and paddy field, while there was no snail in other forest land types. Especially, the occurrence rate of snail frame and the density of snail exhibited the same regularity that was beach﹥irrigation canal﹥paddy field﹥dry land﹥wasteland﹥bottomland poplar forest land. Secondly, on the whole, the suitable conditions including height, cover degree and species richness of herbs for snails’ propagation were 16-20 cm, 80%-90%, 6-7, respectively. The relation between density of snail and height of herb showed y=-0.0248x2 +0.2209x-0.2352, y=-0.1725x2+0.9595x-0.8075, y=-0.0902x2 +0.4055x+1.7143, y=-0.0667x2 + 0.4583x-0.0743, y=-0.2850x2 +1.5490x-0.9550, respectively in bottomland poplar forest land, dry land, beach, wasteland, irrigation canal, and the relation between density of snail and cover degree of herb were y = - 0.0950x2 + 0.3650 x + 0.1550, y= - 0.3350 x2 + 1.9210 x-1.7050 in dry land, wasteland, respectively. In addition, the relation between density of snail and species richness of herb were y =-0.0212x2 + 0.2057x - 0.1781, y = -0.0581x2 + 0.4248x - 0.3000, y=-0.4793x2 + 3.0607x-2.4560, y= - 0.0436x2+0.2704x + 0.2080, y=-0.0675x2 + 0.7788x - 0.9420, y=-0.1282x2 + 0.8186x - 0.4240 in bottomland poplar forest land, dry land, beach, wasteland, irrigation canal and paddy field, respectively.