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目的探讨趋势面分析在水质指标地理分布研究中的可行性。方法采用统计软件对某地区水质监测点的地理坐标和硝酸盐含量进行趋势面方程拟合和等值线图绘制。结果建立了该地区饮水硝酸盐含量的最优趋势面方程,并制作了趋势面等值图;该地区饮水的硝酸盐含量在东北部地区有个高峰区域,呈现东高西低的特点。结论趋势面分析可以用于饮水指标的地理趋势分布研究。
Objective To explore the feasibility of trend surface analysis in the study of geographical distribution of water quality indicators. Methods Statistical software was used to fit the surface coordinates and nitrate content of water quality monitoring points in a certain area with trend surface equation fitting and contour drawing. Results The optimal trend surface equation of nitrate content in drinking water was established and the contour map of trend surface was established. The nitrate content of drinking water in this area has a peak area in the northeast, showing the characteristics of high in the east and low in the west. Conclusion The trend surface analysis can be used to study the geographical trend distribution of drinking water indicators.