Spatial and seasonal variations of nutrients in sediment profiles and their sediment-water fluxes in the Pearl River Estuary, Southern China

Abstract

Three 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.

Keywords

nutrient / pore water / sediment-water flux / Pearl River Estuary

References

Alperin M J, Albert D B, Martens C S. Seasonal Variations in Production and Consumption Rates of Dissolved Organic Carbon in An Organic-Rich Coastal Sediment. Geochimica et Cosmochimica Acta, 1994, 58(22): 4909-4930.

Bally G, Mesnage V, Deloffre J, . Chemical Characterization of Porewaters in an Intertidal Mudflat of the Seine Estuary: Relationship to Erosion-Deposition Cycles. Marine Pollution Bulletin, 2004, 49(3): 163-173.

Beck M, Dellwig O, Liebezeit G, . Spatial and Seasonal Variations of Sulphate, Dissolved Organic Carbon, and Nutrients in Deep Pore Waters of Intertidal Flat Sedi ments. Estuarine, Coastal and Shelf Science, 2008, 79(2): 307-316.

Blackburn T H, Henriksen K. Nitrogen Cycling in Different Types of Sediments from Danish Waters. Limnology and Oceanography, 1983, 28(3): 477-493.

Bode A, González N, Rodríguez C, . Seasonal Variability of Plankton Blooms in the Ria de Ferrol (NW Spain): I. Nutrient Concentrations and Nitrogen Uptake Rates. Estuarine, Coastal and Shelf Science, 2005, 63(1–2): 269-284.

Brigolin D, Lovato T, Rubino A, . Coupling Early-Diagenesis and Pelagic Biogeochemical Models for Estimating the Seasonal Variability of N and P Fluxes at the Sediment-Water Interface: Application to the Northwestern Adriatic Coastal Zone. Journal of Marine Systems, 2011, 87(3–4): 239-255.

Cai W J, Dai M H, Wang Y C, . The Biogeochemistry of Inorganic Carbon and Nutrients in the Pearl River Estuary and the Adjacent Northern South China Sea. Continental Shelf Research, 2004, 24(12): 1301-1319.

Clavero V, Izquierdo J J, Fernández J A, . Seasonal Fluxes of Phosphate and Ammonium across the Sediment-Water Interface in a Shallow Small Estuary (Palmones River, Southern Spain). Marine Ecology Progress Series, 2000, 198: 51-60.

Chai C, Yu Z M, Shen Z L, . Nutrient Characteristics in the Yangtze River Estuary and the Adjacent East China Sea before and after Impoundment of the Three Gorges Dam. Science of the Total Environment, 2009, 407(16): 4687-4695.

Chau K W. Persistent Organic Pollution Characterization of Sediments in Pearl River Estuary. Chemosphere, 2006, 64(9): 1545-1549.

Conley D J, Paerl H W, Howarth R W, . Controlling Eutrophication: Nitrogen and Phosphorus. Science, 2009, 323(5917): 1014-1015.

Dalsgaard T, Thamdrup B, Canfield D E. Anaerobic Ammonium Oxidation (Anammox) in the Marine Environment. Research in Microbiology, 2005, 156(4): 457-464.

Dalsgaard T, Canfield D E, Petersen J, . N₂ Production by the Anammox Reaction in the Anoxic Water Column of Golfo Dulce, Costa Rica. Nature, 2003, 422(6932): 606-608.

Denis L, Grenz C. Spatial Variability in Oxygen and Nutrient Fluxes at the Sediment-Water Interface on the Continental Shelf in the Gulf of Lions (NW Mediterranean). Oceanologica Acta, 2003, 26(4): 373-389.

De Vittor C, Faganeli J, Emili A, . Benthic Fluxes of Oxygen, Carbon and Nutrients in the Marano and Grado Lagoon (Northern Adriatic Sea, Italy). Estuarine, Coastal and Shelf Science, 2012, 113: 57-70.

Domingues R B, Anselmo T P, Barbosa A B, . Nutrient Limitation of Phytoplankton Growth in the Freshwater Tidal Zone of a Turbid, Mediterranean Estuary. Estuarine, Coastal and Shelf Science, 2011, 91(2): 282-297.

Ehrenhauss S, Witte U, Janssen F, . Decomposition of Diatoms and Nutrient Dynamics in Permeable North Sea Sediments. Continental Shelf Research, 2004, 24(6): 721-737.

Fisher T R, Gustafson A B, Sellner K, . Spatial and Temporal Variation of Resource Limitation in Chesapeake Bay. Marine Biology, 1999, 133(4): 763-778.

Grandel S, Rickert D, Schluter M, . Pore-Water Distribution and Quantification of Diffusive Benthic Fluxes of Silicic Acid, Nitrate and Phosphate in Surface Sediments of the Deep Arabian Sea. Deep Sea Research II, 2000, 47(14): 2707-2734.

Grenz C, Denis L, Pringault O, . Spatial and Seasonal Variability of Sediment Oxygen Consumption and Nutrient Fluxes at the Sediment Water Interface in a Sub-Tropical Lagoon (New Caledonia). Marine Pollution Bulletin, 2010, 61(7–12): 399-412.

He T, Xie J, Yu H S, . The Distribution of Nutrients in the Iinterstitial Water and Overlying Water in Daya Bay. Acta Scientiae Circumstantiae, 2008, 28(11): 2361-2368.

Hopkinson C S Jr., Giblin A E, Tucker J. Benthic Metabolism and Nutrient Regeneration on the Continental Shelf of Eastern Massachusetts, USA. Marine Ecology Progress Series, 2001, 224: 1-19.

Hu C Y, Pan J M, Liu X Y, . Study on Distribution and Benthic Fluxes of Nutrients in Sediment Interstitial Water of the Southern Ocean. Acta Oceanologica Sinica, 2006, 28(4): 102-107.

Huang X P, Huang L M, Yue W Z. The Characteristics of Nutrients and Eutrophication in the Pearl River Estuary, South China. Marine Pollution Bulletin, 2003, 47(1–6): 30-36.

Jahnke R, Richards M, Nelson J, . Organic Matter Remineralization and Porewater Exchange Rates in Permeable South Atlantic Bight Continental Shelf Sediments. Continental Shelf Research, 2005, 25(12–13): 1433-1452.

Jenkins M C, Kemp W M. The Coupling of Nitrification and Denitrification in Two Estuarine Sediments. Limnology and Oceanography, 1984, 29(3): 609-619.

Kawagoshi Y, Nakamura Y, Kawashima H, . Enrichment Culture of Marine Anaerobic Ammonium Oxidation (Anammox) Bacteria from Sediment of Sea-Based Waste Disposal Site. Journal of Bioscience and Bioengineering, 2009, 107(1): 61-63.

Liu S M, Zhang J, Yu Z G, . Benthic Fluxes of Dissolved Inorganic Nitrogen in the Laizhou Bay, Bohai Sea. Environmental Science, 1999, 20(2): 12-16.

Lü Y, Chen F R, Yang Y Q, . Study on Profile Distribution of Nutrients and Exchange Fluxes at Sediment-Water Interface in Inner Pearl River Estuary in Spring. Earth and Environment, 2006, 34(4): 1-6.

Ma Y, Wei W, Xia H, . History Change and Influence Factor of Nutrient in Lingdinyang Sea Area of Zhujiang River Estuary. Acta Oceanologica Sinica, 2009, 31(2): 69-77.

Magni P, Montani S. Seasonal Patterns of Pore Water Nutrients, Benthic Chlorophyll A and Sedimentary AVS in a Macrobenthos Rich Tidal Flat. Hydrobiologia, 2006, 571(1): 297-311.

Mayer L M, Jorgensen J, Schnitker D. Enhancement of Diatom Frustule Dissolution by Iron Oxides. Marine Geol ogy, 1991, 99(1–2): 263-266.

Mortimer R J G, Davey J T, Krom M D, . The Effect of Macrofauna on the Porewater Profiles and Nutrient Fluxes in the Intertidal Zone of the Humber Estuary. Estuarine, Coastal and Shelf Science, 1999, 48(6): 683-699.

Ni J Y, Maggiulli M, Liu X Y, . Pore Water Distribution and Quantification of Diffusive Benthic Fluxes of Silicate, Nitrate and Phosphate in Surface Sediments of the Equatorial Northeastern Pacific. Geochimica, 2005, 34(6): 587-594.

Nizzoli D, Bartoli M, Cooper M, . Implications for Oxygen, Nutrient Fluxes and Denitrification Rates during the Early Stage of Sediment Colonisation by the Polychaete Nereis Spp. in Four Estuaries. Estuarine, Coastal and Shelf Science, 2007, 75(1–2): 125-134.

Pan J M, Zhou H Y, Hu C Y, . Nutrient Profiles in Interstitial Water and Flux in Water-Sediment Interface of Zhujiang Estuary of China in Summer. Acta Oceanologica Sinica, 2002, 24(3): 52-59.

Paul J T, Ramaiah N, Sardessai S. Nutrients Regimes and Their Effect on Distribution of Phytoplankton in the Bay of Bengal. Marine Environmental Research, 2008, 66(3): 337-344.

Rosenfeld J K. Ammonium Adsorption in Nearshore Anoxic Sediments. Limnology and Oceanography, 1979, 24(2): 356-364.

Santschi P, Höhener P, Benoit G, . Chemical Processes at the Sediment-Water Interface. Marine Chemistry, 1990, 30(30): 269-315.

Seiki T, Izawa H, Date E. Benthic Nutrient Remineralization and Oxygen Consumption in the Coastal Area of Hiroshima Bay. Water Research, 1989, 23(2): 219-228.

Shi F, Wang X L, Shi X Y, . Benthic Flux of Dissolved Nutrients at the Sediment-Water Interface in the East China Sea. Marine Environmental Science, 2004, 23(1): 5-8.

Sun Y M, Song J M. Functions of China Marginal Sea Sediments in the Cycles of Biogenic Elements. Marine Environmental Science, 2002, 21(1): 26-33.

Slomp C P, Malschaert J F P, Van Raaphorst W. The Role of Adsorption in Sediment-Water Exchange of Phosphate in North Sea Continental Margin Sediments. Limnology and Oceanography, 1998, 43(5): 832-846.

Song J, Luo Y, Li P. Biogeochemical Cycling Models of P and Si near the Sediment-Seawater in Bohai Sea. Marine Sciences, 2000, 12: 30-32.

Sylvan J B, Ammerman J W. Seasonal Distributions of Organic Nutrients on the Louisiana Continental Shelf and Their Implications for Nutrient Limitation and Hypoxia Formation. Marine Chemistry, 2013, 154: 113-123.

Thibodeau B, Lehmann M F, Kowarzyk J, . Benthic Nutrient Fluxes along the Laurentian Channel: Impacts on the N Budget of the St. Lawrence Marine System. Estuarine, Coastal and Shelf Science, 2010, 90(4): 195-205.

Tian X P. The Distribution Characteristics of Temperature in the Lingdingyang, Estuary of Zhujiang. Tropical Oceanology, 1994, 13(1): 76-80.

Van Beusekom J E E, Loebl M, Martens P. Distant Riverine Nutrient Supply and Local Temperature Drive the Long-Term Phytoplankton Development in A Temperate Coastal Basin. Journal of Sea Research, 2009, 61(1–2): 26-33.

Wallmann K, Aloisi G, Haeckel M, . Silicate Weathering in Anoxic Marine Sediments. Geochimica et Cosmochimica Acta, 2008, 72(12): 2895-2918.

Wang L, Shi X, Zhu C, . Nutrient Distribution and Pollution Status in Changjiang Estuary Adjacent Area in Spring. Marine Environmental Science, 2008, 27(5): 466-469.

Xu J, Ho A Y T, Yin K D, . Temporal and Spatial Variations in Nutrient Stoichiometry and Regulation of Phytoplankton Biomass in Hong Kong Waters: Influence of the Pearl River Outflow and Sewage Inputs. Marine Pollution Bulletin, 2008, 57(6-12): 335-348.

Ye X W, Liu S M, Zhang J. Nutrients in Sediment Pore Water in Tidal Flat Area in Yalujiang Estuary. Environmental Science, 2002, 23(3): 92-96.

Yin K D, Qian P, Wu M, . Shift from P to N Limitation of Phytoplankton Biomass across the Pearl River Estuarine Plume during Summer. Marine Ecology Progress Series, 2001, 221: 17-28.

Yin K D, Lin Z F, Ke Z Y. Temporal and Spatial Distribution of Dissolved Oxygen in the Pearl River Estuary and Adjacent Coastal Waters. Continental Shelf Research, 2004, 24(16): 1935-1948.

Yin K D, Harrison P J, Broom M, . Ratio of Nitrogen to Phosphorus in the Pearl River and Effects on the Estuarine Coastal Waters: Nutrient Management Strategy in Hong Kong. Physics and Chemistry of the Earth, 2011, 36(9-11): 411-419.

Yuan X C, He L, Yin K D, . Bacterial Distribution and Nutrient Limitation in Relation to Different Water Masses in the Coastal and Northwestern South China Sea in Late Summer. Continental Shelf Research, 2011, 31(11): 1214-1223.

Zhang L, Yin K D, Wang L, . The Sources and Accumulation Rate of Sedimentary Organic Matter in the Pearl River Estuary and Adjacent Coastal Area, Southern China. Estuarine, Coastal and Shelf Science, 2009, 85(2): 190-196.

Zhang D. Porewater Profiles and Their Benthic Fluxes of Nutrients in the Surrounding Coastal Area of Zhujiang River Estuary: [Dissertation], 2005 Guangzhou: Graduate School of Chinese Academy of Sciences

Zhang X L, Zhu M Y, Tang T Y, . Fluxes of Nutrients at Sediment-Water in Sanggou Bay and Jiaozhou Bay in Summer. Marine Environmental Science, 2004, 23(1): 1-4.