Song Jia-Wei, Xu Gang, Zhang Yang, Lü Ying-Chun
Yantai Coastal Zone Research Institute, Chinese Academy of Sciences, Yantai 264003, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2020 Feb 8;41(2):728-733. doi: 10.13227/j.hjkx.201908013.
Coastal wetland, at the intersection of land and sea, is considered as a "sink", "source", and "transformer" of phosphorus (P). Coastal wetland plays an important role in the global P cycle, and its ability to retain excessive P in water receives increasing attention. In this study, the coastal reed wetland sediments surrounding the Bohai Sea were sampled to investigate P adsorption capacity and loss risk by conducting batch experiments. Results show that the maximum P adsorption capacity () was 693.7-2117.2 mg·kg, with an average of 1468.6 mg·kg. The decreased in the order of Qilihai Wetland > Beidagang Wetland > Nandagang Wetland > Liaohe Delta Wetland > Shouguang Coastal Wetland > Yellow River Delta Wetland. The P adsorption capacity was related to the contents of Ca, Mg, and TOC. The degree of P adsorption saturation (DPS) and loss risk index (ERI) of the coastal wetland were 0.28%-4.50% and 0.53%-10.10%, respectively. The ERI suggested that the P loss risk was relatively low for coastal reed wetland surrounding the Bohai Sea except for the moderate loss risk for Shouguang coastal wetland. In summary, the reed coastal wetland around Bohai Sea demonstrated significantly P storage capacity and served as a P sink for water P. We recommend to fully utilize the coastal wetland to reduce point or non-point source pollution ( P) during the remediation or recovery of the polluted Bohai Sea.
滨海湿地位于陆地与海洋的交汇处，被视为磷（P）的“汇”“源”和“转化器”。滨海湿地在全球磷循环中发挥着重要作用，其对水中过量磷的截留能力受到越来越多的关注。本研究采集了渤海周边的滨海芦苇湿地沉积物样本，通过批次实验研究磷吸附容量和流失风险。结果表明，最大磷吸附容量（）为693.7 - 2117.2 mg·kg，平均为1468.6 mg·kg。其大小顺序为七里海湿地 > 北大港湿地 > 南大港湿地 > 辽河三角洲湿地 > 寿光滨海湿地 > 黄河三角洲湿地。磷吸附容量与钙、镁和总有机碳含量有关。滨海湿地的磷吸附饱和度（DPS）和流失风险指数（ERI）分别为0.28% - 4.50%和0.53% - 10.10%。ERI表明，除寿光滨海湿地存在中度流失风险外，渤海周边滨海芦苇湿地的磷流失风险相对较低。综上所述，渤海周边的芦苇滨海湿地具有显著的磷储存能力，是水体磷的汇。我们建议在污染渤海的修复或恢复过程中，充分利用滨海湿地来减少点源或非点源污染（磷）。
