Nutrients distribution and trophic status assessment in the northern Beibu Gulf, China

Junxiang Lai; Fajun Jiang; Ke Ke; Mingben Xu; Fu Lei; Bo Chen

doi:10.1007/s00343-014-3199-y

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Nutrients distribution and trophic status assessment in the northern Beibu Gulf, China

OriginalPaper | Updated：2023-05-16

- Nutrients distribution and trophic status assessment in the northern Beibu Gulf, China
- Nutrients distribution and trophic status assessment in the northern Beibu Gulf, China
- 海洋湖沼学报（英文） 2014年32卷第5期页码：1128-1144
- Affiliations：
  
  Guangxi Key Laboratory of Marine Environmental Science Guangxi Academy of Sciences
- Author bio：
- Funds：
  
  Supported by the Natural Science Foundation of Guangxi Province, China (Nos. 2012GXNSFEA053001, 2010GXNSFE013001, 2011GXNSFE018002, 2011GXNSFA018108)
- DOI：10.1007/s00343-014-3199-y
  中图分类号：
- 网络首发：2014-05-24，
  
  纸质出版：2014
- Accepted：
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Nutrients distribution and trophic status assessment in the northern Beibu Gulf, China[J]. 海洋湖沼学报（英文）, 2014,32(5):1128-1144.

Lai, J., Jiang, F., Ke, K. et al. Nutrients distribution and trophic status assessment in the northern Beibu Gulf, China., Chin. J. Ocean. Limnol. 32, 1128–1144 (2014). https://doi.org/10.1007/s00343-014-3199-y
Nutrients distribution and trophic status assessment in the northern Beibu Gulf, China[J]. 海洋湖沼学报（英文）, 2014,32(5):1128-1144. DOI： 10.1007/s00343-014-3199-y.

Lai, J., Jiang, F., Ke, K. et al. Nutrients distribution and trophic status assessment in the northern Beibu Gulf, China., Chin. J. Ocean. Limnol. 32, 1128–1144 (2014). https://doi.org/10.1007/s00343-014-3199-y DOI：

摘要

Abstract

Using historical and 2010 field data

the distribution of nutrients in the northern Beibu Gulf of China is described. There was a decreasing trend in the concentration of nutrients from the north coast to offshore waters of the northern Beibu Gulf

reflecting the influence of inputs from land-based sources. High concentrations of dissolved inorganic nitrogen (DIN) and phosphate (PO4-P) occurred mainly at Fangchenggang Bay

Qinzhou Bay

and Lianzhou Bay. Four different methods were used to assess eutrophication. The trophic status of the Beibu Gulf was characterized using the single factor

Eutrophication index (EI)

Trophic index (TRIX) and Assessment of Estuarine Trophic Status (ASSETS) methods. Based on nutrient concentrations

73.9% of DIN and 26.7% of PO4-P samples exceeded the fourth grade Seawater Quality Standard of China. Eutrophication index values varied widely

but higher levels of eutrophication were generally found in bays and estuaries. TRIX values ranged from 2.61 to 7.27

with an average of 4.98

indicating a mesotrophic and moderately productive system. A positive correlation between TRIX and harmful algal species richness and abundance was observed. The ASSETS model evaluates eutrophication status based on a Pressure-State-Response approach

including three main indices: influencing factors

overall eutrophic condition

and future outlook. The Beibu Gulf was graded as moderate using ASSETS. The single factor and Chinese nutrient index methods were considered inadequate for the assessment of trophic status. TRIX can be used as an indicator of trophic state and ASSETS showed good potential to assess eutrophication. The results of TRIX and ASSETS depend on threshold values. To establish these values

further research is required within the northern Beibu Gulf.

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