Effects Of Short-Term Aerobic Conditions On Phosphorus Mobility In Sediments

Yan, Wenming; Liu, Ling; Wu, Tingfeng; Song, Lei; Wang, Han; Lu, Zhanjin; Li, Botao; Zhu, Yan

doi:10.1080/02705060.2019.1659190

Cited by 5 publications

(2 citation statements)

References 35 publications

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“…The different contents of inorganic P forms in sediment were significantly decreased after the process of water diversion, with the highest difference in Fe (OOH)~P content (Figure 5). Phosphate was preferentially bound on the Fe (OOH) particles [42] and apt to be released upon dissolution of ferric oxides under strong reduction conditions [43]. The water introduction to Lake Yuehu created anaerobic conditions at the water-sediment interface, which can trigger inorganic P releasing into the water column from the sediment [44,45].…”

Section: Discussionmentioning

confidence: 99%

Microcystis Bloom in an Urban Lake after River Water Diversion—A Case Study

Chen

Bai

Song

et al. 2020

Water

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To improve the water quality of Lake Yuehu, a water diversion from the Han River was conducted in July 2008. However, an unexpected Microcystis bloom occurred in the lake after water introduction. Water and sediment samples were collected from Lake Yuehu and the variation of chemical and biochemical parameters, as well as the phytoplankton community, were analyzed during the water diversion to assess its effect and to clarify the mechanism leading to the Microcystis bloom. The nitrogen (N) concentration was increased and phosphorus (P) concentration decreased in Lake Yuehu after receiving water from the Han River, which had a high loading of N and a low loading of P. These conditions may benefit the growth and dominance of non-N2 fixing Microcystis, as it may not have suffered from P limitation during our study because it did not produce extracellular phosphatase, which worked as an indicator of P deficiency, as evidenced by the in situ enzyme-labelled fluorescence. Notably, the sediment Fe (OOH)~P content significantly decreased in Lake Yuehu; this pulsed release of P from the sediment might have sustained the Microcystis bloom. Based on our results, algal blooms may occur as a consequence of conducting water diversion projects to improve water quality.

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Section: Discussionmentioning

confidence: 99%

Microcystis Bloom in an Urban Lake after River Water Diversion—A Case Study

Chen

Bai

Song

et al. 2020

Water

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“…Consequently, the T c value during the anoxic period was lower (0.01 day) than that of the aerobic period (0.07 day) indicating that the equilibrium time of the sediment system during the anoxic period was shorter. This means that the response time of the sediment to depletion (release reactive P) is shorter in summer compared to winter (Harper et al 2000;Yan et al 2019). Oppositely, the k 1 and k -1 values were shorter during the aerobic period (14.2 day − 1 for k 1 , 0.101 day − 1 for k -1 ) than the anoxic period (79.4 day − 1 for k 1 , 0.2 day − 1 for k -1 ) (Table 2).…”

Section: Resupply Kinetics (Replenishment) Of P Using the Difs Modelmentioning

confidence: 99%

Seasonal dynamics of iron and phosphorus in reservoir sediments in Eucalyptus plantation region

Norgbey

Yan-peng

et al. 2021

Ecol Process

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Background Iron (Fe) and phosphorus (P) dynamics in sediments have direct and indirect impacts on water quality. However, the mobility of P and Fe in reservoir sediments in Eucalyptus plantation region remains unclear. This study examined P and Fe pollution in sediments in a Eucalyptus plantation region using the novel planar optode, the ZrO-Chelex DGT, and the DIFS model. Results Direct in situ investigations showed that the levels of labile P and Fe were smaller in the Eucalyptus species-dominated sediments (X2) compared to sediments without Eucalyptus species (X1). The mean concentration of labile P and Fe decreased by 25% and 42% from X1 to X2. The decrement was insignificant (p = 0.20) in the surface sediment concentration for labile P. The significant disparity for DGT-Fe (Fe2+) (p = 0.03) observed in the surface sediments could be attributed to the Eucalyptus species’ elevated organic matter (tannins) concentration at X2, which reacted and consumed labile Fe. For both regions, the maximum concentration of labile P and Fe occurred in November (autumn). The reductive decomposition of Fe/Mn oxides was recognized as the main driver for their high P efflux in July and November. Low concentration of labile P and Fe was observed in December (winter) due to the adsorption of Fe/Mn oxides. The concentration of labile Fe synchronizes uniformly with that of labile P in both sediments indicating the existence of a coupling relationship (r > 0.8, p < 0.01) in both regions. The positive diffusion fluxes in both regions suggested that the sediments release labile P and Fe. The fluxes of labile P and Fe in both regions were substantially higher (p < 0.05) in the summer (anoxic period) than winter (aerobic period), indicating that hypoxia and redox conditions influenced the seasonal efflux of labile P and Fe. From the DIFS model, the replenishment ability of reactive P was higher during the anoxic period (R = 0.7, k1 = 79.4 day− 1, k-1 = 0.2 day− 1) than the aerobic period (R = 0.4, k1 = 14.2 day− 1, k-1 = 0.1 day− 1), suggesting that oxygen inhibited the efflux of P in the sediments. Conclusion Our results indicated that hypoxia, Eucalyptus species (organic matter (tannins)), and redox conditions influenced the seasonal mobility of sediment labile P and Fe. Our findings provided an insight into the mobility of labile P and Fe in Eucalyptus-dominated sediments and, moreover, serves as a reference for developing future studies on Eucalyptus-dominated sediments.

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