Journal of Tropical Oceanography ›› 2022, Vol. 41 ›› Issue (6): 1-11.doi: 10.11978/2021111CSTR: 32234.14.2021111

• Special Column: Mangrove Forest •     Next Articles

Characteristics of water quality and their eutrophication assessment on the mangrove ecosystems along the Guangdong coast

INYANG Aniefiok Ini1,2,3,4,5(), ZHOU Yueyue1,2,3,4,5, WANG Youshao1,2,3,5()   

  1. 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
    2. Daya Bay Marine Biology Research Station, Chinese Academy of Sciences, Shenzhen 518121, China
    3. Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
    4. University of Chinese Academy of Sciences, Beijing 100049, China
    5. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
  • Received:2021-08-28 Revised:2022-10-19 Online:2022-11-10 Published:2021-10-20
  • Contact: WANG Youshao E-mail:yswang@scsio.ac.cn;aniefiokinyang@yahoo.com
  • Supported by:
    National Key Research and Development Plan(2017FY100700);National Natural Science Foundation of China(U1901211);National Natural Science Foundation of China(41876126);International Partnership Program of Chinese Academy of Sciences(133244KYSB20180012);Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(GML2019ZD0305);Strategic Priority Research Program of the Chinese Academy of Sciences(XDA23050200)

Abstract:

It was investigated for the spatio-temporal variation of the water quality in the mangroves in Guangdong Province. Surface water samples were collected inside the mangroves from 30 sites during the dry season (Oct., 2017 to Jan., 2018) and 20 sites during the wet season (July to Aug., 2018). Water quality and trophic conditions were highlighted by the single trophic state index (TSI Chl a), and the evaluation standard was: 0<TSI≤30 oligotrophic, 30<TSI≤50 mesotrophic, TSI>50 eutrophic, and >70 high eutrophic. The spatio-temporal variations of the environmental variables were as follows: salinity (2.15‰~27.14‰), pH (6.18~8.65), electrical conductivity (10.87~90.52 µs·cm-1), turbidity (5.6~272 FTU), nitrate (0~127.2 mg·L-1), nitrite (0~12.0 mg·L-1), phosphate (0~34.5 mg·L-1), silicate (1.22~2.88 mg·L-1) and Chlorophyll a (0.19~38.08 mg·m-3). Cluster analysis deduced that the water quality across the right side of the Leizhou Peninsula to the east Guangdong coast during the wet season was relatively better, while the left side experienced mesotrophic conditions. Meanwhile the water quality decreased in the dry season, ranging from high mesotrophic conditions around the Leizhou Peninsula to eutrophic conditions across the east coast. The PCA revealed that nutrient salts, salinity, pH, EC and turbidity contributed significantly to the water quality status in the mangrove ecosystems, which in turn affects the algal communities in the ecosystem.

Key words: algal abundance, nutrients, mangroves, trophic states, Guangdong coast

CLC Number: 

  • X52