Abstract
Coastal wetlands can intercept and retain P from upland sources, limiting excessive P into coastal water. However, factors like hydrologic management and vegetation variations on P retention or removal efficiency have been far from understood. In this study, the rhizosphere sediment and profile samples were collected under different vegetation cover from May to October in 2019 in the wetlands in Yellow River Delta. We used the concept of sediment P storage capacity (SPSC) to estimate the amount of P “sink” or P “source”. The results indicated that the wetlands functioned as a significantly P “sink” because an elevated SPSC value was reported in restored wetland (70–104 mg kg−1) compared with that in non-restored wetland (55–79 mg kg−1). The increased SPSC value was mainly attributed to the significantly increase of sediment organic matter content in the restored wetlands as a result of freshwater restoration of the degraded wetlands. The vegetation cover with higher plant biomass production exhibited higher SPSC value while the SPSC showed no significant variation in different period of plant growth. The SPSC value significantly decreased with sediment depth (0–40 cm) whether the wetlands restored or not. The relatively long safe lifespan of wetlands indicated that the wetland substrate was less saturation and it can environmental friendly store additional P. However, further investigation need to elucidate the role of particulate inorganic phosphorus played in the SPSC calculation of these wetlands. In conclusions, the freshwater restoration provide higher sediment P storage capacity and deserved more application in the degraded wetlands.
摘要
滨海湿地可以截留并存储上游过量磷, 以降低磷对近海环境的威胁。但是湿地管理措施中如湿地生态水湿地植被类型/生长及湿地土层, 它们对湿地磷存储和释放潜力影响还有待进一步研究。本研究采集黄河三角洲湿地根际土壤和剖面土壤样品, 采用磷存储潜力 (SPSC) 方法研究湿地磷的源或汇关系。研究结果表明淡水恢复湿地SPSC值 (70–104 mg kg−1) 明显高于未恢复湿地 (55–79 mg kg−1) 。退化湿地通过淡水恢复显著提高了植物生长和土壤有机质含量, 同时改善了土壤理化性质, 提高了湿地磷的存储潜力。生物量的植被类型和表层土壤均提高了土壤SPSC值, 而植被生长对SPSC值影响不显著。基于磷存储的恢复湿地安全运行年限可达几百年, 可能跟湿地磷负荷较低和基质远未吸附饱和有关。但是黄河水体中高含量的颗粒态磷可能会增加湿地磷负荷和流失风险, 后续需要密切关注。总之, 退化湿地通过淡水恢复增加植被生长的方式可以显著增加湿地磷的存储, 值得大范围推广。
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Data Availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This research was supported by the National Natural Science Foundation of China (41573120, U1806215).
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Yingchun Lv conceived, designed and wrote the manuscript. Xiaoyao Li and Yuxuan Ren performed the experiments, analyzed the data. Haibin Hui collected the sample and analyzed the data. Gang Xu analyzed the data and edited the manuscript. All authors read and approved the final manuscript.
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Lv, Y., Li, X., Ren, Y. et al. “Safe” Sequestration of Additional Phosphorus in Freshwater Wetland and Salt Marsh at Coastal Zone in the Yellow River Delta. Wetlands 43, 59 (2023). https://doi.org/10.1007/s13157-023-01665-8
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DOI: https://doi.org/10.1007/s13157-023-01665-8