文献类型：期刊文献

英文题名：Effects of river input flux on spatiotemporal patterns of total nitrogen and phosphorus in the Pearl River Estuary, China

作者：Ke, Sheng[1];Cai, Zhimei[2];Zhang, Peng[2,3,4];Zhang, Junxiao[3,5];Zhang, Jibiao[2]

机构：[1]Guangdong Ocean Univ, Analyt & Testing Ctr, Zhanjiang, Guangdong, Peoples R China;[2]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang, Guangdong, Peoples R China;[3]Minist Nat Resources, Key Lab Marine Environm Survey Technol & Applicat, Guangzhou, Guangdong, Peoples R China;[4]Guangdong Ocean Univ, Res Ctr Coastal Environm Protect & Ecol Resilience, Zhanjiang, Guangdong, Peoples R China;[5]State Ocean Adm, South China Sea Marine Technol & Survey Ctr, Guangzhou, 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:000948728300001)、、Scopus(收录号：2-s2.0-85150197630)、WOS

基金：This research was financially supported by Research and Development Projects in Key Areas of Guangdong Province (2020B1111020004); Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resource, P.R. China (MESTA-2020-B014); the Guangdong Basic and Applied Basic Research Foundation (2020A1515110483); Guangdong Ocean University Fund Project (R18021); Guangxi Key Research and Development Program (GuiKeAB22035065), First-class Special Fund (231419018); Innovation Strong School Project of Guangdong Ocean University (230420021).

语种：英文

外文关键词：spatiotemporal pattern; total nitrogen; total phosphorus; riverine flux; coastal water; Pearl River Estuary

外文摘要：The increasing riverine nutrient sources have significantly affected the ecological environment of estuaries and coastal waters, resulting in deteriorating land-sea water quality and intensified eutrophication. However, the effects of river input flux on spatiotemporal patterns of total nitrogen (TN) and total phosphorus (TP) were poorly understood in the Pearl River Estuary (PRE). In this study, the spatiotemporal patterns of TN and TP concentrations and river input flux of PRE were studied based on the seasonal nutrients monitoring data obtained for the rivers and estuary in 2019. The results showed the spatiotemporal patterns of the TN and TP concentrations in the eight rivers of the PRE were different, and the annual average concentrations of TN and TP in the rivers entering the PRE were 207.18 +/- 105.13 and 3.51 +/- 1.70 mu mol/L, respectively. The annual river TN and TP fluxes discharged into the PRE were 8.61 x 10(10) and 1.55 x 10(9) mol/year, respectively. In addition, the significantly decreasing trends in of TN and TP concentrations from upper estuary to offshore seawater were observed in the PRE, which implied TN and TP showed conservative behaviour in all season and only the dry season, respectively. Moreover, the annual average concentrations of TN and TP in the estuary were 70.64 +/- 10.10 and 1.67 +/- 0.78 mu mol/L, respectively. The annual average ratios of TN/TP for rivers, freshwater, mixed and seawater were 59.31 +/- 5.98, 59.45 +/- 3.75, 45.73 +/- 21.27 and 330.94 +/- 434.71 respectively, which were higher than the Redfield ratios. These results indicated that the water quality in most areas of the PRE is significantly polluted and that the TN and TP in seawater were significantly influenced by river inputs. Therefore, monitoring and management of unified TN and TP nutrient indicators discharge from rivers entering the sea can be strengthened in the PRE, and eutrophication mitigation strategy should be established and implemented across river-estuary-coast continuum systems in the Great Bay Area.