Li Le, Wang Sheng-Rui, Jiao Li-Xin, Yu You-Jin, Ding Shuai, Wang Yue-Jie
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Research Center of Lake Eco-Environment, State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Huan Jing Ke Xue. 2016 Sep 8;37(9):3384-3393. doi: 10.13227/j.hjkx.2016.09.017.
Columnar sediment samples were collected from the Waihai of Lake Dianchi in northern, central and southern sediment, combined with the data of phosphorus in the overlying water and sediment organic matter, the effects of organic matter and particle size on sediment release were studied, and the influence of different forms of phosphorus release from sediments and their contributions were discussed. The results showed:Sediment pore water (DTP) and (SRP) was negatively correlated with contents of OM, clay (<4.00 μm) and silt (4.00-63.00 μm), but it showed a significant positive correlation with sand (>63.00 μm) content. Theincrease in organic matter content of the sediments significantly reduced the gap water phosphorus mass concentration, and increasing clay and silt contents reduced the gap water phosphorus mass concentration, inhibiting the release of phosphorus in sediments. Potentially mobile phosphorus of the Lake Dianchi sediment was significantly positively correlated with the clay and silt contents, and was significantly negatively correlated with the sand content. It was indicated that clay and silt may enhance the phosphorus movement ability of the sediment, and the sand may enhance the retention of phosphorus in the sediment. In a short time scale, phosphorus of sediment was released mainly in northern Waihai, staying mainly in central and southern; in a longer time scale, phosphorus of sediment was released mainly in northern and central Waihai, staying mainly in southern. Control of phosphorus release from sediments in Lake Dianchi should take into account the effects of different forms of phosphorus, organic matter and particle size, and take corresponding measures to control the release of phosphorus in sediments of northern Dianchi mainly.
从滇池外海北部、中部和南部沉积物中采集柱状沉积物样品，结合上覆水磷含量和沉积物有机质数据，研究了有机质和粒径对沉积物释放的影响，并探讨了沉积物中不同形态磷释放的影响及其贡献。结果表明：沉积物孔隙水总溶解磷（DTP）和溶解性反应磷（SRP）与有机质、黏土（<4.00μm）和粉砂（4.00 - 63.00μm）含量呈负相关，但与砂（>63.00μm）含量呈显著正相关。沉积物有机质含量增加显著降低间隙水磷质量浓度，黏土和粉砂含量增加也降低间隙水磷质量浓度，抑制沉积物中磷的释放。滇池沉积物潜在移动性磷与黏土和粉砂含量显著正相关，与砂含量显著负相关。表明黏土和粉砂可能增强沉积物的磷迁移能力，而砂可能增强沉积物对磷的滞留能力。在短时间尺度上，沉积物磷主要在北部外海释放，主要滞留在中部和南部；在较长时间尺度上，沉积物磷主要在北部和中部外海释放，主要滞留在南部。滇池沉积物磷释放控制应考虑不同形态磷、有机质和粒径的影响，主要针对滇池北部沉积物磷释放采取相应控制措施。
