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Fluxes of riverine nutrient to the Zhujiang River Estuary and its potential eutrophication effect

Acta Oceanologica Sinica 2022年第6期41卷 88-98页

作者： Li Zhang Yumin Yang Weihong He Jie Xu Ruihuan Li Marine Environmental Testing Center South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China Guangdong Environmental Monitoring Center Guangzhou 510308China College of Marine Science University of Chinese Academy of SciencesQingdao 266404China

The Zhujiang River Estuary is becoming eutrophic due to the impact of anthropogenic activities in the past *** understand nutrient dynamics and fluxes to the lingdingyang water via four outlets(Humen,Jiaomen,Hongqimen and Hengmen),we investigated the spatial distribution and seasonal variation of dissolved nutrients in the Zhujiang River Estuary,based on fourteen cruises conducted from March 2015 to October 2017,covering both wet(April to September)and dry(October to March next year)*** results showed that riverine fluxes of dissolved inorganic nitrogen(DIN)and dissolved silicate(DSi)into the lingdingyang water through four outlets varied seasonally due to the influence of river discharge,with the highest in spring and the lowest in ***,riverine flux of phosphate exhibited little significant seasonal *** nutrients into the lingdingyang water most resulted through Humen *** estuarine export fluxes of DIN out of the Zhujiang River Estuary derived from a box model were higher than fluxes of riverine nutrients in May,likely due to the influence of local sewage,while lower than riverine flux in *** export fluxes of phosphate were higher than the fluxes of riverine phosphate in May and *** contrast,large amounts of DSi were buried in the estuary in May and *** excess DIN was delivered into the Zhujiang River Estuary,eutrophication effect was not as severe as expected in the Zhujiang River Estuary,since the light limitation restricted the utilization of nutrients by phytoplankton.

关键词： riverine nutrient flux lingdingyang Zhujiang River Estuary eutrophication

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Late Quaternary Calcareous Nannofossils from the Offshore Sediments in southern Hongkong

引用

Acta Geologica Sinica(English Edition) 1999年第2期73卷 242-247页

作者： HUANG Yongyang CHEN Fang Guangzhou Marine Geological Survey MGMR Guangzhou 510075

Abstract Based upon the features of nannofossil composition, distribution, abundance and diversity, the fossil-bearing sediments exposed by five drill holes in the offshore area of southern Hongkong can be divided into the upper Middle Pleistocene, the Upper Pleistocene and Holocene. There were two palaeoclimatic stages in the Holocene in this area according to fossil palaeoecologic and sedimentation analyses: the temperature-rising stage and the warm stage. The latter involves two temperature-falling periods, which could be the major factor causing sea-level fall during that time.

关键词： nannofossil Quaternary palacooceanography lingdingyang southern Hongkong

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