School of Environment, State Key Laboratory of Water Environment Simulation, Beijing Normal University, Beijing 100875, P.R. China.
School of Geography and Ocean Science, Changbai Mountain Key Laboratory of Biological Resources and Functional Molecules, Yanbian University, Yanji 133003, P.R. China.
Environ Sci Technol. 2021 May 18;55(10):6783-6790. doi: 10.1021/acs.est.1c00135. Epub 2021 May 4.
River delta-front estuaries (DEs) are vital interfaces for fluxes between terrestrial and marine environments. However, deep uncertainty exists in estimating the sedimentary pollutant flux from terrestrial environments in DEs due, in part, to a lack of direct measurements in these dynamic and complicated regions and uncertainty in the calculation method. Due to its high sediment content, the Yellow River (YR) has a strong ability to adsorb phosphorus; therefore, it reliably reflects estuarine sedimentary processes. Here, through the comprehensive analysis of field samples, monitoring data and remote sensing images, we conclude that riverine fine particles control the deltaic estuary pollution status and that particle size is the key factor. Based on the stable relationships between phosphorus and heavy metals, with values of 0.990, 0.992, and 0.639 for As, Cd, and Cr, respectively, we estimated that the P flux reached 22.68 g/m yr in 2017. Analysis of the YR high-silt sediment load, which has a strong phosphorus adsorption ability and constitutes a substantial fraction of global fluvial sediment transport, revealed a negative correlation between the riverine sediment load and the estuarine phosphorus flux.
河流三角洲前缘河口（DEs）是陆地和海洋环境之间通量的重要界面。然而，由于在这些动态和复杂的地区缺乏直接测量以及计算方法的不确定性，因此在估算来自河口的陆地环境的沉积物污染物通量方面存在很大的不确定性。由于黄河（YR）的高含沙量，其具有很强的吸附磷的能力；因此，它可以可靠地反映河口的沉积过程。在这里，我们通过对野外样本、监测数据和遥感图像的综合分析，得出结论：河流细颗粒控制了三角洲河口的污染状况，而颗粒大小是关键因素。基于磷与重金属之间的稳定关系，As、Cd 和 Cr 的 值分别为 0.990、0.992 和 0.639，我们估计 2017 年的磷通量达到了 22.68 克/米年。对具有较强磷吸附能力且构成全球河流泥沙输运主要部分的黄河高泥沙负荷的分析表明，河流泥沙负荷与河口磷通量之间呈负相关关系。
