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Effects of Suspended Particulate Reactive Phosphorus on Phosphorus Cycle in the Pearl River Estuary

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Abstract

Phosphorus (P) is potentially the most limiting nutrient in the Pearl River estuary, and thus, it is important to understand various sources of P. Suspended particulate matter (SPM) is usually high in the river and carries P. We hypothesize that suspended particulate reactive P (PRP) is a potential source of dissolved P and varies with estuarine hydrodynamics. To test the hypothesis, we conducted a cruise along and cross the Pearl River estuary to examine spatial variability of suspended PRP. Suspended PRP ranged at 0.01–2.65 μM, contributing 1.2–97.4% to total reactive P (TRP). Along the estuary, suspended PRP was 1.49 μM upstream and decreased downstream. Across the estuary, suspended PRP was high (1.58 μM) at low salinity and decreased eastward with increasing salinity. Tidal cycles appeared to play a significant role in regulating the variability of suspended PRP through advection and benthic resuspension of SPM. The proportion of PRP/TRP increased seaward from 1.2 to 94.8%, indicating the increasing importance of PRP in total reactive P downstream. We show that suspended particulate reactive P varied greatly and was an important part of the total phosphorus pool in the Pearl River estuary.

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Funding

This study was supported by grants from the Guangdong-NSF China Joint Scheme Key Project (U1701247) and the NSF China (No.91328203) and the NMENC-SYSU contract *#201819 and the NNSF China (No. 41406133).

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Authors and Affiliations

  1. School of Marine Sciences/Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-sen University, Guangzhou, 510006, China

    Fei Lan, Yafeng Zhang, Lei He & Kedong Yin

  2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China

    Fei Lan, Yafeng Zhang, Lei He & Kedong Yin

  3. Eco-Environmental Monitoring and Research Center, Pearl River Valley and South China Sea Ecology and Environment Administration Ministry of Ecology and Environment, Guangzhou, People’s Republic of China

    Yafeng Zhang

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  1. Fei Lan
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Lan, F., Zhang, Y., He, L. et al. Effects of Suspended Particulate Reactive Phosphorus on Phosphorus Cycle in the Pearl River Estuary. Estuaries and Coasts 44, 1310–1319 (2021). https://doi.org/10.1007/s12237-020-00863-5

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