Sun Qiyao, Sheng Yanqing, Yang Jian, Di Bonito Marcello, Mortimer Robert J G
Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.
Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.
Environ Pollut. 2016 Dec;219:588-595. doi: 10.1016/j.envpol.2016.06.019. Epub 2016 Jun 22.
The cycling of sulfur (S), iron (Fe) and phosphorus (P) in sediments and pore water can impact the water quality of overlying water. In a heavily polluted river estuary (Yantai, China), vertical profiles of fluxes of dissolved sulfide, Fe and dissolved reactive phosphorus (DRP) in sediment pore water were investigated by the Diffusive Gradients in Thin films technique (DGT). Vertical fluxes of S, Fe, P in intertidal sediment showed the availability of DRP increased while the sulfide decreased with depth in surface sediment, indicating that sulfide accumulation could enhance P release in anoxic sediment. In sites with contrasting salinity, the relative dominance of iron and sulfate reduction was different, with iron reduction dominant over sulfate reduction in the upper sediment at an intertidal site but the reverse true in a freshwater site, with the other process dominating at depth in each case. Phosphate release was largely controlled by iron reduction.
沉积物和孔隙水中硫（S）、铁（Fe）和磷（P）的循环会影响上覆水的水质。在中国烟台一个重度污染的河口，采用薄膜扩散梯度技术（DGT）研究了沉积物孔隙水中溶解硫化物、铁和溶解活性磷（DRP）通量的垂直剖面。潮间带沉积物中S、Fe、P的垂直通量表明，表层沉积物中DRP的有效性随深度增加，而硫化物减少，这表明硫化物积累可增强缺氧沉积物中P的释放。在盐度不同的地点，铁还原和硫酸盐还原的相对优势不同，在一个潮间带地点的上层沉积物中铁还原占主导地位，而在淡水地点则相反，在每个地点的深部另一个过程占主导地位。磷酸盐的释放主要受铁还原控制。
