论文部分内容阅读
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=-0.024 8x2+0.220 9x-0.235 2、y=-0.172 5x2+0.959 5x-0.807 5、y=-0.090 2x2+0.405 5x+1.714 3、y=-0.066 7x2+0.458 3x-0.074 3、y=-0.285 0x2+1.549 0x-0.955 0的关系,旱地、荒地的钉螺密度与草本盖度分别呈现y=-0.095 0x2+0.365 0x+0.155 0、y=-0.335 0x2+1.921 0x-1.705 0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=-0.021 2x2+0.205 7x-0.178 1、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 distribution characteristics of snail in six land use types and the relationship between snail distribution and herbality in different land use types were studied. The results showed that: (1) Oncomelania was found in poplar woodland, dry land, floodplain, wasteland, ditches and paddy fields in the beach land, but not in other woodland types, and the occurrence rate of snail frame was consistent with that of snail density > Ditch> paddy field> dry land> wasteland> poplar woodland of beach land. (2) The height, cover and species richness of the herbaceous plants that are most suitable for snail breeding are 16-20 cm, 80-90% and 6-7, respectively 3) The snail density and the herb height of poplar woodland, dry land, floodplain, wasteland and ditch of the beach are y = -0.024 8x2 + 0.220 9x-0.235 2, y = -0.172 5x2 + 0.959 5x-0.807 5, y = -0.090 The relationship between snail density and herbaceous cover in dry land and barren land are y = -0.095, y = -0.066 7x2 + 0.458 3x-0.074 3, y = -0.285 0x2 + 1.549 0x- 0.955 0, respectively. The relationship between snail density and herbaceous species abundance in poplar woodland, dry land, floodplain, wasteland, ditch and paddy field in floodplain is y = -0.021 2x2 + 0.205 7x-0.178 1, y = -0.0581x2 + 0.4248x-0.3000, y = -0.4793x2 + 3.0607x-2.4560, y = -0.0436x2 + 0.2704x + 0.2080, y = -0.0675x 2 + 0.7788x-0.9420, y = -0.1282x2 + 0.8186x-0.4240.