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地理环境因子对螺情影响的探测分析

DOI: 10.11820/dlkxjz.2014.05.004, PP. 625-635

Keywords: 地理环境因子,地理探测器,钉螺,湖北省,血吸虫病,指示作用

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Abstract:

近年来,由于自然环境、经济社会等因素影响,中国血吸虫病疫情呈回升态势,表现为急性感染人数和血吸虫病患病人数增多,局部地区钉螺扩散明显,感染性钉螺分布范围逐渐扩大等。钉螺是血吸虫的唯一中间宿主,控制钉螺对血吸虫病防治具有重要意义。本文根据钉螺的生态学特征,综合高程、水文、土地利用、土壤、植被等因子,基于地理探测器模型分析了地理环境因子对2009年湖北省钉螺分布的影响。结果表明①在垸内型流行区,整个流行季(3-10月)、特别是7-9月期间的植被覆盖与钉螺分布范围有关,密螺地带的特征为土壤质地粉砂含量适中、黄红壤和淹育水稻土,第一季度有较高的植被覆盖度;②在垸外型流行区,湖泊滩地、高覆盖度草地是其主要分布环境,而第一季度较高的植被覆盖,尤其是荻、芦苇等植被类型是高密度地区的环境特征;③在山地丘陵,河流附近的林地和耕地,潴育或淹育水稻土是钉螺密集分布的环境。筛选出的地理环境指示因子可用于遥感技术监测钉螺孳生地,从而为采取有效的控螺措施提供科学依据。

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