Characteristics and mechanisms of nitrogen exchanges across the sediment-water interface of the macrophyte- and algae-dominated areas under the influence of suspended particulate matter deposition

Wenxuan Han; Xu He; Tan Lixian; Cheng Liu; Lei Zhang

doi:10.18307/2025.0114

January 1, 2025Journal of Lake SciencesOpen Access

Characteristics and mechanisms of nitrogen exchanges across the sediment-water interface of the macrophyte- and algae-dominated areas under the influence of suspended particulate matter deposition

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Key Points

To investigate the characteristics and mechanisms of nitrogen speciation, transformation, and exchange across the sediment-water interface under the influence of suspended particulate matter deposition in macrophyte- and algae-dominated lake areas.
Conducted a one-year monthly field monitoring campaign in macrophyte-dominated and algae-dominated zones of Lake Taihu.
Quantified concentrations and occurrence forms of nitrogen species across overlying water, suspended particulate matter (SPM), and sediment samples.
Mean water total nitrogen (TN) was lower in the macrophyte area (0.97 ± 0.23 mg/L, range 0.50–1.51 mg/L) than in the algae area (3.67 ± 1.36 mg/L, range 1.77–6.12 mg/L).
Mean SPM TN (6998.48 ± 1413.87 mg/kg vs 5162.63 ± 2205.13 mg/kg) and sediment TN (4219.75 ± 216.62 mg/kg vs 3187.88 ± 103.07 mg/kg) were higher in the macrophyte zone than in the algae zone.
Ammonia nitrogen was the primary available nitrogen form in both zones, with the proportion of available nitrogen reaching 5.17% in the algae zone during bloom season versus 4.34% in the macrophyte zone.

Implication

Field study reveals distinct sediment-water nitrogen exchange dynamics between macrophyte- and algae-dominated lake zones, indicating particulate matter deposition drives internal nitrogen cycling.

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Cite This Study

Han et al. (2025) studied this question.

synapsesocial.com/papers/6a867cda005d37d90fd09d44 https://doi.org/10.18307/2025.0114

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Characteristics and mechanisms of nitrogen exchanges across the sediment-water interface of the macrophyte- and algae-dominated areas under the influence of suspended particulate matter deposition

Key Points

Implication

Abstract

Discussion

Cite This Study

Characteristics and mechanisms of nitrogen exchanges across the sediment-water interface of the macrophyte- and algae-dominated areas under the influence of suspended particulate matter deposition

Key Points

Implication

Abstract

Discussion

Cite This Study

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