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https://doi.org/10.5194/bg-2016-455
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-2016-455
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Submitted as: research article 12 Dec 2016

Submitted as: research article | 12 Dec 2016

Review status
This discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The revised manuscript was not accepted.

Phytoplankton communities determine the spatio-temporal heterogeneity of alkaline phosphatase activity: evidence from a tributary of the Three Gorges Reservoir

Yijun Yuan1,2, Yonghong Bi1, and Zhengyu Hu1 Yijun Yuan et al.
  • 1Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China
  • 2University of Chinese Academy of Sciences, 100049, Beijing, China

Abstract. In order to know the role of phytoplankton communities in the distribution pattern of alkaline phosphatase activity (APA), monthly investigation was conducted in the Xiaojiang River, a tributary of the Three Gorges Reservoir (TGR). Different APA fractions (APAT, APA< 0.45 μm, APA0.45–3 μm and APA> 3.0 μm), environmental parameters, and phytoplankton communities were screened synchronously. Significant spatio-temporal differences of APA with the highest value in summer and the lowest in winter (P < 0.05) were observed. The annual average APAT ranged from 7.78–14.03 nmol L−1 min−1 with the highest in the midstream and the lowest in the estuary. The dominant phytoplankton species in summer and winter were Cyanophyta and Bacillariophyta, respectively. The mean cell density in the midstream and in the estuary were 5.2 × 107 cell L−1 and 1.4 × 107 cell L−1, respectively. That APA> 3.0 μm were significantly higher than APA0.45–3 μm indicated phytoplankton was the main contributor to alkaline phosphatase. Correlation analysis indicated the dominant species and cell density could determine the distribution pattern of APA. Turbidity (Turb), total phosphorus (TP), chemical oxygen demand (COD), water temperature (WT), pH and chlorophyll a (Chl a) were proved to be positively correlated with APA; soluble reactive phosphorus (SRP), conductivity (Cond), transparency (SD) and water level (WL) were negatively correlated with APA. It was concluded that spatio-temporal heterogeneity of APA determined by phytoplankton communities was related to water temperature and hydrodynamics.

Yijun Yuan et al.
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Yijun Yuan et al.
Yijun Yuan et al.
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Short summary
Alkaline phosphatase plays an important role in phosphorus cycling. In order to screen the alkaline phosphatase activity in the tributaries of the Three Gorges reservoir, annual investigation was conducted in the Xiaojiang River. It was proved that APA in the tributaries of TGR contributed mainly by phytoplankton, and the spatio-temporal heterogeneity of APA was determined by phytoplankton communities. Besides, WL, WT and SRP regulated the spatio-temporal heterogeneity of APA.
Alkaline phosphatase plays an important role in phosphorus cycling. In order to screen the...
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