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Spatial and Seasonal Variations of Nutrients in Sediment Profiles and Their Sediment-Water Fluxes in the Pearl River Estuary, Southern China
Zhang, L; Wang, L; Yin, KD; Lu, Y; Yang, YQ; Huang, XP; lzhang@scsio.ac.cn; yinkd@mail.sysu.edu.cn
2014
Source PublicationJOURNAL OF EARTH SCIENCE
ISSN1674-487X
Volume25Issue:1Pages:197-206
AbstractThree cruises were launched in the Pearl River Estuary (PRE) in 2005 to investigate the biogeochemical cycling of nutrients associated with early diagenesis related to degradation of organic matter. Seasonal and spatial variations of pore water nutrient concentrations and profile patterns in sediments were studied. Nutrient fluxes at the sediment-water interface (SWI) were measured by incubation experiments, and we here discussed the accumulation and transformation processes of nutrients at the SWI. The nutrients generally decreased from the Pearl River outlets downstream, indicating anthropogenic influences on the nutrient inputs in the estuary. NO3-N concentration was the highest of the three forms of DIN (dissolved inorganic nitrogen, the sum of NH4-N, NO3-N and NO2-N) in the overlying water, and NH4-N was the main component of DIN in pore water. The gradual increase of NH4-N and the rapid decrease of NO3-N with sediment depth provided the evidence for anaerobic conditions below the SWI. Negative fluxes of NO3-N and positive fluxes of NH4-N were commonly observed, suggesting the denitrification of NO3-N at the SWI. The DIN flux direction suggested that the sediment was the sink of DIN in spring, however, the sediment was generally the source of DIN in summer and winter. PO4-P distribution patterns were distinct while SiO4-Si inconspicuously varied in sediment profiles in different seasons. The flux results indicated that PO4-P mainly diffused from the water column to the sediment while SiO4-Si mainly diffused from the sediment to the water column. Generally, the incubated fluxes were the coupling of diffusion, bioturbation and biochemical reactions, and were relatively accurate in this study.
Department[Zhang, Ling ; Huang, Xiaoping] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China ; [Wang, Lu] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China ; [Yin, Kedong] Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510275, Guangdong, Peoples R China ; [Lu, Ying] Beijing Normal Univ, Sch Environm, Beijing 100875, Peoples R China ; [Yang, Yongqiang] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
KeywordNutrient Pore Water Sediment-water Flux Pearl River Estuary
Subject AreaGeology
Funding OrganizationNational Natural Science Foundation of China [91328203, 41306110] ; National Natural Science Foundation of China [91328203, 41306110] ; National Natural Science Foundation of China [91328203, 41306110] ; National Natural Science Foundation of China [91328203, 41306110]
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Indexed Bysci
Funding ProjectLMB
Funding OrganizationNational Natural Science Foundation of China [91328203, 41306110] ; National Natural Science Foundation of China [91328203, 41306110] ; National Natural Science Foundation of China [91328203, 41306110] ; National Natural Science Foundation of China [91328203, 41306110]
WOS IDWOS:000330554900016
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Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/10476
Collection中科院海洋生物资源可持续利用重点实验室
Corresponding Authorlzhang@scsio.ac.cn; yinkd@mail.sysu.edu.cn
Recommended Citation
GB/T 7714
Zhang, L,Wang, L,Yin, KD,et al. Spatial and Seasonal Variations of Nutrients in Sediment Profiles and Their Sediment-Water Fluxes in the Pearl River Estuary, Southern China[J]. JOURNAL OF EARTH SCIENCE,2014,25(1):197-206.
APA Zhang, L.,Wang, L.,Yin, KD.,Lu, Y.,Yang, YQ.,...&yinkd@mail.sysu.edu.cn.(2014).Spatial and Seasonal Variations of Nutrients in Sediment Profiles and Their Sediment-Water Fluxes in the Pearl River Estuary, Southern China.JOURNAL OF EARTH SCIENCE,25(1),197-206.
MLA Zhang, L,et al."Spatial and Seasonal Variations of Nutrients in Sediment Profiles and Their Sediment-Water Fluxes in the Pearl River Estuary, Southern China".JOURNAL OF EARTH SCIENCE 25.1(2014):197-206.
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