文献类型：期刊文献

英文题名：Seasonal nutrients variation, eutrophication pattern, and Chlorophyll a response adjacent to Guangdong coastal water, China

作者：He, Yingxian[1];Zhang, Peng[1];Xu, Fang[1];Zhao, Lirong[1];Zhang, Jibiao[1]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang, Guangdong, Peoples R China

年份：2023

卷号：10

外文期刊名：FRONTIERS IN MARINE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:001093663800001)、、Scopus(收录号：2-s2.0-85168680283)、WOS

基金：The authors are grateful for the reviewers' careful review and valuable suggestions to improve the manuscript.r This research was financially supported by Research and Development Projects in Key Areas of Guangdong Province (2020B1111020004); the Guangdong Basic and Applied Basic Research Foundation (2023A1515012769); Guangdong Basic and Applied Basic Research Foundation (2020A1515110483); Key Laboratory of Marine Environmental Survey Technology and Application Ministry of Natural Resource, P.R. China (MESTA-2020-B014); Guangdong Ocean University Fund Project (R18021).

语种：英文

外文关键词：nutrients; eutrophication pattern; chlorophyll a; coastal water; Guangdong

外文摘要：Nutrients were the key biogenic elements for the primary production in coastal water, and the increase of nutrient concentration led to eutrophication and frequent occurrence of harmful algal blooms. However, the seasonal nutrients variation, eutrophication pattern, and Chlorophyll a (Chl-a) response adjacent to Guangdong coastal water were still scarcely. In this study, to clarity the seasonal nutrients variation, eutrophication pattern, and Chl-a, response adjacent to coastal water, the spatiotemporal dissolved inorganic nitrogen (DIN) and phosphorus (DIP) patterns and Chl-a were explored by field observation using 52 stations in the coastal waters of Guangdong Province during the dry (April and May), wet (July and August) and normal (October and November) seasons in 2020. The results showed that the variability of Chl-a, DIN and DIP were significantly different in seasons (P<0.01), and the mean concentrations of Chl-a, DIN and DIP were 11.97 +/- 28.12 g/L, 25.84 +/- 35.72 mu mol/ L and 0.59 +/- 0.71 mu mol/L.Among them, the mean value of Chl-a increased significantly from 9.99 +/- 9.84 mu g/L in the dry season to 18.28 +/- 38.07 mu g/L in the wet season, and then decreased significantly to 7.65 +/- 27.64 mu g/L in the normal season.The mean DIN value decreased significantly from 30.68 +/- 43.58 mu mol/L in the dry season to 21.91 +/- 35.45 mu mol/L in the wet season, and then increased to 24.91 +/- 26.12 mu mol/L in the normal season. the mean DIP value decreased from 0.58 +/- 0.73 mu mol/L in the dry season to 0.48 +/- 0.65 mu mol/L in the wet season and then increased significantly to 0.70 +/- 0.73 mu mol/L in the normal season. In addition, the DIN and DIP concentrations at most monitoring stations met the Grade II national seawater quality standards, and only a few monitoring stations fail to meet the Grade IV national seawater quality standard. The DIN/DIP ratios ranged from 2.05 to 259.47, with an average of 43.77 +/- 41.01, far exceeding the Redfield ratio, indicating the presence of P limitation in the nearshore waters of Guangdong Province. Besides, the EI values in the coastal waters of Guangdong Province are higher at 0.00 and 82.51, with an average of 4.16 +/- 10.90. DIN and DIP were significantly and positively correlated with COD in each season (P<0.05). Moreover, DIN/DIP showed significantly positive correlations with Chl-a in all seasons (P<0.01), indicating that high Chl-a concentrations could be sustained by the nutrients supply in marine ecosystems. Therefore, it is necessary to strengthen the integrated management of land and sea and effectively mitigate regional estuarine and coastal water eutrophication and harmful algal blooms.