Enhancement of phosphorus storage capacity of sediments by coastal wetland restoration, Yellow River Delta, China
2020
Un-restored (R₀) and restored (in 2006 (R₂₀₀₆) and in 2002, (R₂₀₀₂)) coastal wetlands were selected to study phosphorus (P) storage capacity and the risk of P loss in the Yellow River Delta (YRD). The results showed that the maximum P sorption capacity (Qₘₐₓ) in the wetland sediments varied between 201.8–1168.6 mg kg⁻¹; the average value was 576.2 mg kg⁻¹. Qₘₐₓ increased with increasing time since restoration (R₂₀₀₂ > R₂₀₀₆ > R₀). The eutrophication risk index (ERI) ranged between 0.27–2.07% and decreased with increasing time since restoration, but the relationship was not statistically significant (P > 0.05). A correlation analysis demonstrated that Feₒₓ, Mg, and Alₒₓ are the main P sorption agents in wetland sediments, whereas TOC, pH, and clay particles have an important effect on P sorption and release. The analysis suggests that we should restore degraded coastal wetlands to help reduce the P load to offshore waters.
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