Preliminary manifestation of the Yangtze River Protection Strategy in improving the carbon sink function of estuary wetlands.

Considering the three shoals as a whole ( Figure 6 D), it was found that most of the chemical indicators monitored gradually decreased from 2016 to 2018 (e.g., DOC: from 2.31 to 1.89 mg/L; TPH: from 0.11 to 0.10 mg/L; TN: from 2.49 to 1.46 mg/L; NO 3 -N: from 1.91 to 1.18 mg/L; and TP: from 0.28 to 0.25 mg/L), while AP showed a slightly increasing trend from 0.06 to 0.09 mg/L.

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The SR in the same shoal presented a decreasing trend with time (NS: 2.48, 2.31, and 1.90 μmol m −2 s −1 , SS: 1.91, 1.47, and 1.06 μmol m −2 s −1 ; XS: 1.30, 0.97, and 0.65 μmol m −2 s −1 ), and the SR in the same year presented a decreasing trend from upstream to downstream (NS > SS > XS).

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