The evolution of water quality is monthly and yearly, and the response to the acidification of environment is strong.
水质演化具有明显的逐月和年际变化规律；水质演化对环境酸化具有很好的响应。
The monthly and yearly evolution of water quality were studied by means of PCA, and its response to environment acidification is analyzed by means of correlation.
采用主成分分析的方法，探讨了不同统计口径水质演化的年际和月变化特征。
Based on the monitoring data of groundwater quality in Dezhou City, the paper discusses water quality characteristic and analyzes the water quality evolution of deep groundwater.
根据德州市地下水水质监测数据，本文论述了深层地下水的水质特征，分析研究了深层地下水的水质演化。
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