中文摘要：

目的研究江西省星子县不同位置钉螺孳生地螺情的纵向变化及与近期水位的关系。方法收集江西省星子县西观湖、马家湾、西庙前3个洲滩2001—2010年的螺情资料以及水位资料，探讨螺情的纵向变化，用Spearman秩相关分析钉螺消长与近期水位变化的关系。结果马家湾洲滩和西庙前洲滩有螺框出现率和活螺密度最高分别为89．66％（442／493）（2002年）和66．72％（872／1307）（2007年）、8．33（2001年）和7．39只／框（2006年），最低为13．26％（126／950）（2010年）和4．60％（55／1195）（2005年）、0．42（2010年）和0．22只／框（2002年），2007年以后均出现下降趋势；西观湖洲滩最高为56．77％（197／347）和2．81只／框（2002年），最低为3．52％（30／852）和0．08只／框（2006年），2007年后呈上升趋势。马家湾洲滩于2005和2009年发现阳性螺，阳性螺密度与阳性螺出现率分别为0．0033和0．0025只／框、0．09％（3／3306）和0．22％（3／1389）；西庙前洲滩于2001、2003、2005、2009年均发现阳性螺，其中2005年阳性螺密度和阳性螺出现率最高，分别为0．0050只／框和0．88％（6／684）；西观湖洲滩于2002和2003年发现阳性螺，阳性螺密度和阳性螺出现率分别为0．0029和0．0027只／框、0．10％（1／974）和0．32％（1／312）。spearman秩相关分析显示，西观湖洲滩有螺框出现率和活螺密度与查螺前1个月（r=0．76，0．82）和查螺前2个月（r=0．71，0．78）平均水位的相关性均具有统计学意义（P〈O．05）；马家湾洲滩有螺框出现率和活螺密度与查螺前近3个月内平均水位的相关性均无统计学意义（P〉O．05）；而西庙前洲滩有螺框出现率和活螺密度与查螺前1个月（r=-0．67，-0．79）和查螺前2个月（r=-0．75，-0．72）平均水位则均呈负相关（P〈O．05）。结论江西省星子县不同空间位置的?

英文摘要：

Objective To study the longitudinal change of data on Oncomelania hupensis surveillance in differ- ent marshlands and the impact of recent water level in Xingzi County, Jiangxi Province. Methods All information in- eluding water level of hydrometric station and the data of snails at the marshlands of Xiguanhu, Majiawan and Ximiao- qian was collected to explore the longitudinal change of snails and analyze the relationship between snail distribution and recent water level with Spearman rank correlation analysis. Results The highest proportion of frames with living snails and living snail densities at Majiawan and Ximiaoqian was 89.66% （442/493） in 2002 and 66.72% （872/1 307） in 2007,8.33 in 2001 and 7.39 snails per frame in 2006, respectively, and the lowest was 13.26% （126/950） in 2010 and 4.60% （55/1 195） in 2005, 0.42 in 2010 and 0,22 snails per frame in 2002, respectively, and tended to decrease gradually af- ter 2007. At Majiawan, infected snails were found in 2005 and 2009, the density and proportion of infected snails were 0.0033 and 0.0025 snails per frame, 0.09% （3/3 306） and 0.22% （3/1 389）. Infected snails were found in Ximiaoqian in 2001, 2003, 2005 and 2009, the highest density and proportion of infected snails were 0.005 0 snails per frame and 0.88% （6/684） in 2005. Infected snails were found in Xiguanhu in 2002 and 2003 with a density and proportion of 0.0029 and 0.0027 snails per frame, 0.10% （1/974） and 0.32% （1/312）, respectively. The correlation analysis between proportion of frames with living snails and density at Xiguanhu with the average water level of the first and second month before snail survey showed statistical significance, the correlation coefficient was 0.76, 0.71, 0.82 and 0.78（P〈0.05）, respec- tively. The correlation between proportion of frames with living snails and density at Majiawan showed no statistical sig- nificance with the average water level of recent three months before snail survey. The proportion of frames with living snails