In general, the wetland ecosystems showed a decreasing trend in the total Hg output of the downstream watershed.
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Process of mercury accumulation in urban strip river artificial wetland ecosystems: a case study of Changchun, a typical industrial city in Northeast China.
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The sentences
The Donglai South Street Wetland and Bayhood Wetland showed a gradual decrease with seasonal changes in spring, summer and fall, and an increasing trend in winter. 3.2.