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目的探索湘江长沙段洲滩螺情与水源距离、土壤湿度、植被分布、汛期平均水位的关系。方法应用基于格网数据驱动的GIS空间分析方法,结合洲滩标准化植被指数、土壤湿度,对2005-2009年湘江流域长沙段的螺情信息进行分析,并对汛期平均水位与螺情反复、洲滩钉螺密度的变化关系进行分析。结果 2005年甑皮州钉螺主要分布在距最近水源40～240m的范围内,60m处分布最多。钉螺密度与水位存在较明显的正相关性。2005年甑皮州标准化植被指数范围为0～0.982,土壤湿度范围为0～0.298,植被类型分布以杂草和莎草为主。基于水源基准线作出了年度螺情变化的洲滩螺情势图,可直观了解螺情发展情况。结论利用格网数据驱动的螺情信息空间分析方法,可以更准确地反映钉螺网格所在地的植被和土壤湿度状况以及洲滩钉螺的态势,从而及时掌握流行状况。即使在人工干预的情况下,水位变化仍然是导致螺情变化的重要因素。
Objective To explore the relationship between water resources, soil moisture, vegetation distribution and flood season average water level in Dachangtan, Changsha, Hunan Province. Methods Based on grid data driven GIS spatial analysis method, combined with the standardized vegetation index and soil moisture of Chau Beach, the information of spiral lobe in Changsha section from 2005 to 2009 in Xiangjiang River Basin was analyzed. The average water level in flood season, The relationship between the density of beach snail density was analyzed. Results In 2005, Piranha was mainly distributed in the range of 40 ~ 240m from the nearest water source, with the highest distribution at 60m. Snail density and water level there is a more obvious positive correlation. In 2005, Piupu standardized vegetation index ranged from 0 to 0.982, and soil moisture ranged from 0 to 0.298. The distribution of vegetation type was dominated by weeds and sedge. Based on the baseline of water resources, the situation of Chaundanluo, a year-round spiral of changes in spirals, has been made and an intuitive understanding of the development of the spirals can be obtained. Conclusion The grid data-driven spire information spatial analysis method can reflect the vegetation and soil moisture conditions of the snail grid and the status of the snail of the island beach more accurately, and thus grasp the epidemic situation in a timely manner. Even with human intervention, changes in water levels are still an important factor that leads to changes in snails.