Saha Ajoy, Vijaykumar M E, Das B K, Samanta S, Khan M Feroz, Kayal Tania, Jana Chayna, Chowdhury Arnab Roy
ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata 700 120, India.
Regional Centre of ICAR-Central Inland Fisheries Research Institute, Bangalore 560 089, India.
Mar Pollut Bull. 2023 Feb;187:114543. doi: 10.1016/j.marpolbul.2022.114543. Epub 2023 Jan 12.
Estuaries are the most productive transition ecosystem and phosphorus (P) plays an important role in these ecosystems. Therefore, in the present study, sequential extraction method was used to determine the abundance of five sediment P fractions (calcium (Ca-P), Iron (FeP), aluminum (AlP), exchangeable (Ex-P) and organic (OrgP) bound P) in Netravathi-Gurupur estuary, India. Total phosphorus (TP) content varied from 435-810 mg/kg (non-monsoon) and 258-699 mg/kg (monsoon). Inorganic P was dominant part. Different P fractions followed similar order (Fe-P > Ca-P > Al-P > Org-P > Ex-P) with respect to seasons. FeP was dominant fraction, indicating probable anthropogenic stress. Sediment may act as source of P as bioavailable P constituted 40-69.2 % of TP. Molar ratio of OC to Org-P in sediment indicated terrestrial sources of organic matter. However, the estimated phosphorus pollution index were lower than one except a few cases indicating less ecological risk with respect to sedimentary TP load.
河口是生产力最高的过渡生态系统，磷（P）在这些生态系统中起着重要作用。因此，在本研究中，采用连续提取法测定了印度内特拉瓦蒂-古鲁布尔河口五种沉积物磷组分（钙结合磷（Ca-P）、铁结合磷（FeP）、铝结合磷（AlP）、可交换磷（Ex-P）和有机磷（OrgP））的含量。总磷（TP）含量在非季风期为435 - 810毫克/千克，季风期为258 - 699毫克/千克。无机磷是主要部分。不同的磷组分在不同季节遵循相似的顺序（Fe-P > Ca-P > Al-P > Org-P > Ex-P）。FeP是主要组分，表明可能存在人为压力。沉积物可能作为磷的来源，因为生物可利用磷占总磷的40 - 69.2%。沉积物中有机碳与有机磷的摩尔比表明有机物质来自陆地。然而，除少数情况外，估计的磷污染指数低于1，表明沉积物总磷负荷的生态风险较小。
