Regional Centre of ICAR-Central Inland Fisheries Research Institute, Bangalore, 560089, Karnataka, India.
ICAR - Central Inland Fisheries Research Institute, Barrackpore, Kolkata, 700120, West Bengal, India.
Environ Geochem Health. 2022 Mar;44(3):749-769. doi: 10.1007/s10653-021-00985-0. Epub 2021 May 29.
Eutrophication level in lakes and reservoirs depends on both internal and external phosphorus (P) load. Characterization of sediment P fractionation and identifying the P pollution sources are important for assessing the bio-availability of P and the dominant P source, for effectively controlling the water pollution. For determining the availability and sources of sediment P and eutrophication status, spatio-temporal variation in different P fractionation of sediment of hyper-eutrophic Krishnagiri reservoir, Tamil Nadu, India, was investigated. Sediment average total P (TP) content ranged from 4.62 to 5.64 g/kg. Main phosphorus form was the inorganic P (IP), and it makes up to 73.4-87.7% of TP. Among the different P fraction, viz. calcium bound (Ca-P), iron bound (Fe-P), aluminium bound (Al-P), exchangeable (Ex-P) and Organic-P (Org-P), Ca-P was the dominating fraction in both IP and TP. Trend of IP fraction was as follows: Ca-P > Fe-P > Al-P > Ex-P in pre-monsoon season, Fe-P > Ca-P > Al-P > Ex-P in monsoon and Ca-P > Al-P > Fe-P > Ex-P in post-monsoon. Overall the trend was as follows Ca-P > Fe-P > Al-P > Org-P > Ex-P. Bio-available-P (BAP) fractions ranged from 35.2 to 64.0% of TP, indicating its comparative higher value. Pearson's correlation matrix revealed that there was strong correlation among the different P fractions. Factor analysis indicates that different fractions of P were the dominating factor than the other sediment parameters. The observed variation in sediment P fractionation indicate the differences in source and characterization of P which is very helpful for implementation of effective management practices in controlling pollution that arises due to phosphorus in this hyper-eutrophic reservoir.
湖泊和水库的富营养化水平取决于内部和外部的磷（P）负荷。对沉积物磷形态进行特征描述和确定磷污染源对于评估磷的生物可利用性和主要磷源，以及有效控制水污染非常重要。为了确定沉积物磷的有效性和来源以及富营养化状况，对印度泰米尔纳德邦克里希纳格里水库超富营养化沉积物不同磷形态的时空变化进行了研究。沉积物平均总磷（TP）含量范围为 4.62 至 5.64 g/kg。主要磷形态为无机磷（IP），占 TP 的 73.4-87.7%。在不同的磷形态中，即钙结合态（Ca-P）、铁结合态（Fe-P）、铝结合态（Al-P）、可交换态（Ex-P）和有机磷（Org-P）中，Ca-P 是 IP 和 TP 的主要形态。IP 形态的趋势如下：在旱季，Ca-P>Fe-P>Al-P>Ex-P；在雨季，Fe-P>Ca-P>Al-P>Ex-P；在雨季之后，Ca-P>Al-P>Fe-P>Ex-P。总的来说，趋势是 Ca-P>Fe-P>Al-P>Org-P>Ex-P。生物有效磷（BAP）分数范围为 TP 的 35.2%至 64.0%，表明其相对较高的价值。皮尔逊相关矩阵显示，不同磷形态之间存在很强的相关性。因子分析表明，不同的磷形态是主要因素，而其他沉积物参数则是次要因素。沉积物磷形态的变化表明磷的来源和特征存在差异，这对于实施控制富营养化水库中磷污染的有效管理实践非常有帮助。
