The underestimated role of manganese in modulating the nutrient structure in a eutrophic seasonally-stratified reservoir,Water Research

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The underestimated role of manganese in modulating the nutrient structure in a eutrophic seasonally-stratified reservoir
Water Research ( IF 11.4 ) Pub Date : 2024-06-13 , DOI: 10.1016/j.watres.2024.121940
Zifu Xu ₁ , Lianghao Ge ₁ , Wenbin Zou ₁ , Bingchen Lv ₁ , Jun Yang ₂ , Zijian Chai ₁ , Xiaoyu Guo ₁ , Xunchi Zhu ₃ , Shuh-Ji Kao ₄

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Accumulation and subsequent release of nutrients have great potential to trigger algal blooms in lakes and reservoirs. We conducted high vertical resolution (2 m interval) monitoring at ∼monthly intervals over a year for hydrological parameters, Chl-, ammonium (NH), nitrate (NO) and different species of phosphorus (P) and manganese (Mn) in a 40-meter-deep subtropical reservoir (Shanmei Reservoir) in Fujian, southern China. In this seasonally stratified reservoir featured with high nutrient loading, the consistent trend in the ratio of dissolved inorganic nitrogen (DIN) to dissolved inorganic phosphorus (DIP) between the euphotic zone and the hypolimnion, coupled with its mirrored correlation with Chl- concentration indicates that upward flux from the hypolimnion affects phytoplankton growth in the euphotic zone. The monthly variation of the depth-integrated multiple species of N and P indicates that during the stratification period in the hypoxic hypolimnion, approximately 80% of the DIP is removed, leading to a remarkable decoupling phenomenon between NH and DIP. This process effectively increases the ratio of DIN to DIP in the hypolimnion, thereby significantly reducing the potential of algal blooms caused by the upward flux. A robust positive linear correlation between iron-manganese bound phosphorus (CBD-P) and particulate Mn was observed during stratification period implying that DIP was scavenged by sediment-released Mn throughout the water column. Vertical profiles during stratification showed that upward diffusion of Mn facilitated the formation of Mn oxide zones near the oxycline. The most significant decrease in DIP inventory occurs when Mn oxide zones migrate either upwards from the bottom or downwards from the oxycline, indicating that the migration of Mn oxides on the vertical profile is a key factor in the decoupling of NHand DIP.

更新日期：2024-06-13

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