This investigation aimed to determine the contents of biogenic SiO₂ and different phosphorus forms (P) and to evaluate phosphorus ecological risk in surface sediment of Anzali wetland. According to the results, biogenic SiO₂ ranged from 0.29 to 3.04%. Also, the average biogenic SiO₂ at all studied stations was 1.36 ± 0.83%. Results indicated that total P (TP) was between 493 and 771 ppm, averaged 637.20 ± 79.41 ppm. Moreover, inorganic P (INTP) ranged from 256.63 to 376.89 ppm and composed 51.46 ± 4.68% of total P. The percentage of P-forms was in descending order: residual-P > Fe-P > Ca-P > Al-P > labile-P. Phosphorus pollution index (PPI) ranged from 0.82 to 1.29, with an average of 1.06 in the sediment of the Anzali wetland. The Sediment P saturation (SPS) values varied considerably from 40.96 to 83.57, with an average SPS value of 49.1. Based on the eutrophication risk index, all stations except one had a low eutrophication risk index.

本次调查旨在测定安扎里湿地表层沉积物中生物源SiO ₂和不同磷形态（P）的含量，评估磷生态风险。根据结果​​，生物源 SiO _{2 的}范围为 0.29 至 3.04%。此外，所有研究站点的平均生物 SiO ₂为 1.36 ± 0.83%。结果表明，总磷 (TP) 介于 493 和 771 ppm 之间，平均为 637.20 ± 79.41 ppm。此外，无机磷 (INTP) 范围为 256.63 至 376.89 ppm，占总磷的 51.46 ± 4.68%。 P 形式的百分比按降序排列：残留-P > Fe-P > Ca-P > Al-P >不稳定的磷污染指数（PPI）范围为0.82~1.29，安扎里湿地沉积物平均为1.06。沉积物 P 饱和度 (SPS) 值在 40.96 到 83.57 之间变化很大，平均 SPS 值为 49.1。根据富营养化风险指数，除一个站点外，所有站点的富营养化风险指数均较低。