Abstract:

Objective   To study the impact of vegetation changes on the distribution of Oncomela-
nia hupensis in the marshland and lake regions.  Methods    A bottomland from the 14 bottomlands a-
long the Qiupu River in the Guichi District, Chizhou City, Anhui Province was selected, and a 50 m
X 50 m area of uniform vegetation was choosed as the research field.  Low-grass group, boundary-
grass group, hay group and control group were designed to represent four types of vegetation's sta-
tus and the snail density, soil temperature and soil moisture were surveyed half a month after the
design. The change of Oncmnelania hupensis's distribution due to the vegetation change was ana-
lyzed statistically. Results   The snail density of the hay group was nearly O with high soil moisture
and low soil temperature.  The snail density of the low-grass group was obviously decreased (32.1/
O.l mz), and the snail density of the boundary group slightly increased, which had no statistical
significance compared with the snail density of the control group. Conclusions   Oncmnelania hupen-
sis moves from the low-grass group to the boundary group after the vegetation is cut down, which
changes the distribution of snail. Hay group is the worst environment for Oncamelania hupensis to
survive and the method of cut-overlay grass may be used to improve the effect of molluscicide.  

Key words:  Oncomelania hupensis, Vegetation, Distribution, Marshland and lake regions

摘要：

 目的研究湖沼地区植被自然状态的改变对钉螺分布的影响。方法从安徽省池州市贵池区秋浦河沿岸的14块滩地中随机选择一块滩地，选取植被均- 50 mX50 m作为研究现场，分别设计矮草组、边界组、枯草组和对照组4组不同植被状态的研究区域，半个月后调查4组的钉螺密度、土壤温度和土壤湿度，分析比较4组数据间的差异，推断植被自然状态的改变引起钉螺分布的变化情况。结果枯草组土壤湿度大，温度低，钉螺密度为0.1只10.1  m2；矮草组土壤温度高，湿度低，钉螺密度为32.1只10.1  m2；边界组钉螺密度增高（53.6只/O.l m2），但与对照组钉螺密度(48.2只10.1 m2)比较差异无统计学意义。结论人为割倒滩地植被后，钉螺将由矮草组向边界组移动，导致钉螺分布发生变化；枯草组最不适宜钉螺生存。割草覆盖法可以作为提高药物灭螺效果的辅助措施。

关键词: 钉螺；植被；分布；湖沼地区