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湖沼地区湖北钉螺小尺度分布的空间自相关分析

ISSN号：1005-6661
期刊名称：中国血吸虫病防治杂志
时间：0
页码：418-423
语言：中文
分类：R383.24[医药卫生—医学寄生虫学;医药卫生—基础医学]
作者机构：[1]复旦大学公共卫生学院流行病学教研室、教育部公共卫生安全重点实验室,上海200032, [2]安徽省池州市贵池区血吸虫病防治站
相关基金：国家自然科学基金重大项目（30590374）、国家高技术研究发展计划（863计划）（2006AA022402）
相关项目：基于现代信息技术研究传染病时空传播与流行规律

中文摘要：

目的研究湖沼地区湖北钉螺小尺度分布的空间自相关性。方法从安徽省池州市贵池区的秋浦河沿岸随机选择一个滩地的中间层和河边层作为研究现场，采用交叉复核随机抽检的查螺方法于滩地水淹前后各普查钉螺100框，判别死活，并分辨成螺和幼螺。在两层内各随机取10份土壤样本，测量土壤湿度。先计算并比较水淹前后两层的土壤湿度和钉螺密度，然后计算Moran’s I和Geary’s C两个空间自相关指标，探讨钉螺的小尺度分布情况及是否存在空间自相关。结果钉螺的小尺度分布始终存在正空间自相关，其变化与钉螺密度的高低一致。Moran’s I均〉0．22，Geary’s C均〈0．76，P〈0．01。水淹前，河边层钉螺的空间自相关大于中间层；水淹后，中间层幼螺和成螺的空间自相关均大于河边层，并且同一层内幼螺的空间自相关均大于成螺。结论湖沼地区湖北钉螺的小尺度分布存在正空间自相关。

英文摘要：

Objective To study the spatial autocorrelation on the small-scale distribution of Oncomelania hupensis in marshland and lake regions. Methods A bottomland was randomly selected from the Oiupu River in Guichi District, Chizhou City, Anhui Province, and the selected bottomland was divided into three parts according to the distance from the Oiupu River （riverside, middle and roadside）. The two parts of the riverside and middle in the bottomland were selected as the study field for not being affected by external matters. The snails were censused carefully and the sample size was 100 frames respectively. All the snails were brought back to the laboratory to distinguish whether they were alive or not and tell mature snails from young snails. During the snail surveying, 10 soil samples were also randomly collected from the two parts of the riverside and middle in the bottomland, and their humidity were measured. The soil humidity and snail density were calculated respectively, and the multiple comparisons were also performed. Finally, the values of Moran＇s I and Geary＇s C statistic were calculated to test whether Oncomelania hupensis had spatial autocorrelation, and how it changed. Results Oncomelania hupensis had positive spatial autocorrelation, which changed consistently with snail density. The values of Moran＇s I statistic were all greater than 0. 22, and the values of Geary＇s C statistic were all less than 0.76, and their P values were all less than 0.01. Spatial autocorrelation of Oncomelania hupensis in the riverside of the bot-tomland was greater than that in the middle of the bottomland before floods, but less than that in the middle of the bottomland after the floods. Spatial autocorrelation of the young snails was greater than that of the mature snails in both the riverside and middle of the bottomland. Conclusion Positive spatial autocorrelation exists on the small-scale distribution of Oncomelania hupensis in marshland and lake regions.

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