5 a), which showed an increasing trend during the period 2000 ~ 2020.
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Exploring the factors influencing the carbon sink function of coastal wetlands in the Yellow River Delta.
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The sentences
The results showed that the SOC stock in the 0 ~ 100 cm depth in 1999, 2004, 2009, 2013 and 2020 were about 7.8871 Tg C, 7.5785 Tg C, 7.1661 Tg C, 7.4453 Tg C, and 7.0521 Tg C, respectively, indicating that the SOC stock showed a decreasing trend in non-linear fluctuations from 1999 to 2020.