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目的了解北京市某区自备井水质现状及空间分布特征。方法在对北京市某区2013年自备井普查数据描述性分析的基础上,采用空间自相关的方法探讨空间分布特征。结果北京市某区自备井水总体合格率为69.25%,主要不合格项目为总硬度和硝酸盐,合格率分别为87.89%和88.38%。总硬度和硝酸盐在整体上存在空间自相关,全局Moran’s I指数分别为0.4404(P<0.01)和0.5335(P<0.01)。总硬度呈现北低南高的趋势,硝酸盐主要是南部地区偏高。结论北京市某区自备井水合格率偏低,总硬度和硝酸盐存在空间聚集现象。
Objective To understand the present situation and spatial distribution characteristics of self-prepared wells in a certain area of Beijing. Methods Based on the descriptive analysis of 2013 census data from a certain area in Beijing, spatial autocorrelation was used to explore the spatial distribution characteristics. Results The overall qualified rate of self-provided well water in a certain area of Beijing was 69.25%. The main unqualified items were total hardness and nitrate, with the pass rates of 87.89% and 88.38% respectively. There was spatial autocorrelation between the total hardness and nitrate, and the global Moran’s I index was 0.4404 (P <0.01) and 0.5335 (P <0.01) respectively. The total hardness shows a trend of north and south high, nitrate is mainly high in the southern region. Conclusions The qualified rate of self-provided well water in a certain area of Beijing is low, and the total hardness and the accumulation of nitrate exist in space.