The behavior of phosphate in the Xiangshan Bay and its potential impact on harmful algal blooms

Yang Zhi; Ran Lihua; Xu Xiaoqun; Ji Zhongqiang; Zhu Yong; Chen Qianna; Chen Jianfang

doi:10.3969/j.issn.0253-4193.2018.10.007

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Yang Zhi, Ran Lihua, Xu Xiaoqun, Ji Zhongqiang, Zhu Yong, Chen Qianna, Chen Jianfang. The behavior of phosphate in the Xiangshan Bay and its potential impact on harmful algal blooms[J]. Haiyang Xuebao, 2018, 40(10): 61-70. doi: 10.3969/j.issn.0253-4193.2018.10.007

Citation:

Yang Zhi, Ran Lihua, Xu Xiaoqun, Ji Zhongqiang, Zhu Yong, Chen Qianna, Chen Jianfang. The behavior of phosphate in the Xiangshan Bay and its potential impact on harmful algal blooms[J]. Haiyang Xuebao, 2018, 40(10): 61-70. doi: 10.3969/j.issn.0253-4193.2018.10.007

Citation:

Yang Zhi, Ran Lihua, Xu Xiaoqun, Ji Zhongqiang, Zhu Yong, Chen Qianna, Chen Jianfang. The behavior of phosphate in the Xiangshan Bay and its potential impact on harmful algal blooms[J]. Haiyang Xuebao, 2018, 40(10): 61-70. doi: 10.3969/j.issn.0253-4193.2018.10.007

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The behavior of phosphate in the Xiangshan Bay and its potential impact on harmful algal blooms

doi: 10.3969/j.issn.0253-4193.2018.10.007

1.
Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
2.
Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China;State Key Laboratory of Satellite Ocean Environment Dynamics, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2018-04-22
Rev Recd Date: 2018-06-08

Abstract

Abstract

The estuarine distributions of salinity and nutrients (ammonium, nitrite, nitrate, and phosphate) measured in May 2012 and October 2017 were used to study the sources and assimilation of phosphate and the processes that control phosphate distributions within the Xiangshan Bay. In the upper bay, the highest phosphate concentrations observed during both surveys indicates a significant source of phosphate in this area, which was likely from the domestic sewage or/and mariculture. In the lower bay, the distributions of salinity, nitrate and phosphate suggest that phosphate in this area was likely from the Changjiang River and Qiantangjiang River. In addition, the different distribution patterns of nitrate and phosphate in the Fodu and Niubishan channels indicate a local input of phosphate. In the upper bay, phosphate distributions were controlled mainly by the mixing of waters from the upper bay and the lower bay and phytoplankton assimilation. Significant phosphate consumption was observed in the upper bay. In May 2012 and October 2017, phosphate was removed by~20% and~9%, respectively, in the upper bay compared to the calculated mixing line. The phosphate concentration has been found to increase by more than 50% compared to that in the same season of 2002 to 2005, and N/P ratio decreased significantly, which would result in variation of algal bloom species and occurrence of more serious harmful algal bloom.
- phosphates,
- phosphate sources,
- phosphate distribution,
- harmful algal bloom,
- Xiangshan Bay

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