From 1991 to 2019, the dryness index in the Dongjiangyuan River first decreased, then increased, and decreased again; the average temperature in the source basin of the Dongjiangyuan River showed an increasing trend.
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Research on Ecoenvironmental Quality Evaluation System Based on Big Data Analysis.
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The sentences
The NDVI value in the source basin of Dongjiangyuan River showed a trend of first increasing, then decreasing, and then increasing.