Total inputs of phosphorus and nitrogen by wet deposition into Lake Taihu, China

Lake Taihu suffers from eutrophication caused by riverine nutrient inputs and air deposition. To characterize wet deposition of phosphorus (P) and nitrogen (N) to the lake, precipitation collection and measurements of total phosphorus (TP) and total nitrogen (TN) and other components at five cities around Lake Taihu were made from July 2002 to June 2003. TP and TN concentrations and deposition rates exhibited strong spatial variation in the whole catchment. An inverse correlation between station-averaged TP and TN concentrations and precipitation amount was found. Maximal TP concentration in rainfall was found in Suzhou, and maximal TN in Wuxi. However, highest wet deposition rates of TP and TN were found in Suzhou, which suggests that atmospheric nutrients are mostly from the east and northwest area of Lake Taihu. Mean TP and TN deposition rates were 0.03 and 2.0 t km−2 year−1 respectively in Lake Taihu, which are greater than reported values in other areas by comparision. Total N and P contributed to the lake by wet deposition were 75 and 4720 t per year, respectively, which represent about 7.3% and 16.5% of total annual N and P inputs via inflow rivers. Wet deposition, especially N, could have significant effects on eutrophication in the lake, which shows that air deposition should be taken into account while reducing the external nutrients in the lake.

[1]  R. Wright,et al.  Impact of acid precipitation on freshwater ecosystems in Norway , 1976 .

[2]  E. Gorham,et al.  Ecological aspects of air pollution from an iron sintering plant at Wawa, Ontario , 1963 .

[3]  O. Schrems,et al.  Wet deposition of metals to the tropical North and the South Atlantic ocean , 1995 .

[4]  Guoxiang Wang,et al.  A physico-ecological engineering experiment for water treatment in a hypertrophic lake in China , 1998 .

[5]  M. Melville,et al.  Chemical controls on acid discharges from acid sulfate soils under sugarcane cropping in an eastern Australian estuarine floodplain , 1998 .

[6]  W. Battaglin,et al.  Atmospheric nitrogen in the Mississippi River Basin--emissions, deposition and transport. , 2000, The Science of the total environment.

[7]  Tim A. Wool,et al.  A SEDIMENT RESUSPENSION AND WATER QUALITY MODEL OF LAKE OKEECHOBEE 1 , 1997 .

[8]  M. Igawa,et al.  Deterioration of concrete structures by acid deposition — an assessment of the role of rainwater on deterioration by laboratory and field exposure experiments using mortar specimens , 2000 .

[9]  K. Bruland,et al.  Spatial and temporal variability in copper complexation in the North Pacific , 1990 .

[10]  M. Ma,et al.  Distribution, sources and potential toxicological significance of polycyclic aromatic hydrocarbons(PAHs) in Guanting Reservoir sediments, China. , 2005, Journal of environmental sciences.

[11]  J. W. Winchester,et al.  Sources of nitrogen in three watersheds of northern Florida, USA: Mainly atmospheric deposition , 1994 .

[12]  D. Schaefer,et al.  Atmospheric concentrations and deposition of nitrogen and major ions in conifer forests in the United States and Federal Republic of Germany , 1990 .

[13]  Qixing Zhou,et al.  Potential pollution and recommended critical levels of phosphorus in paddy soils of the southern Lake Tai area, China , 2003 .

[14]  E. Gorham.  Acid deposition and its ecological effects: a brief history of research , 1998 .

[15]  G. Leeuw,et al.  Atmospheric nitrogen inputs into the North Sea: effect on productivity , 2003 .

[16]  F. Morel,et al.  Limitation of productivity by trace metals in the sea , 1991 .

[17]  S. Filoso,et al.  Composition and deposition of throughfall in a flooded forest archipelago (Negro River, Brazil) , 1999 .

[18]  J. Perry,et al.  Wet deposition of phosphorus in Florida , 2002 .

[19]  X C Wang,et al.  Organo-chlorine pesticide (DDT and HCH) residues in the Taihu Lake Region and its movement in soil-water system I. Field survey of DDT and HCH residues in ecosystem of the region. , 2003, Chemosphere.

[20]  C. Migon,et al.  Phosphorus in rainwater: Partitioning inputs and impact on the surface coastal ocean , 1999 .

[21]  G. Pan,et al.  Characteristics of nitrate horizontal transport in a paddy field of the Tai Lake region, China. , 2003, Chemosphere.

[22]  J. Aber,et al.  Forest biogeochemistry and primary production altered by nitrogen saturation , 1995 .

[23]  J. Galloway,et al.  Episodic atmospheric nitrogen deposition to oligotrophic oceans , 1992, Nature.

[24]  J. Westendorf,et al.  Toxicological profile of pollutants in surface water from an area in Taihu Lake, Yangtze Delta. , 2001, Toxicology.

[25]  O. Krüger,et al.  High atmospheric nitrogen deposition events over the North Sea , 1993 .

[26]  J. Aber,et al.  Nitrogen Excess in North American Ecosystems: Predisposing Factors, Ecosystem Responses, and Management Strategies , 1998 .

[27]  Yuan Gao.  Atmospheric nitrogen deposition to Barnegat Bay , 2002 .

[28]  Boqiang Qin,et al.  Dynamics of sediment resuspension and the conceptual schema of nutrient release in the large shallow Lake Taihu, China , 2004 .

[29]  Xu Peng-zhu.  Water Quantity and Pollutant Fluxes of the Surrounding Rivers of Lake Taihu during the Hydrological Year of 2001 -2002 , 2005 .

[30]  W. Stock,et al.  Atmospheric Deposition of Phosphorus in a Coastal Fynbos Ecosystem of the South-Western Cape, South Africa , 1984 .

[31]  J. Kinsman,et al.  Atmospheric pollutant deposition to high-elevation ecosystems , 1990 .

[32]  Parmeshwar L. Shrestha.  An integrated model suite for sediment and pollutant transport in shallow lakes , 1996 .

[33]  Y. Peter Sheng,et al.  The transport and resuspension of sediments in a shallow lake , 1979 .

[34]  Stefan Reis,et al.  Assessment of the atmospheric nitrogen and sulphur inputs into the North Sea using a Lagrangian model , 2002 .

[35]  C. Gibson,et al.  Substance budgets of an upland catchment: the significance of atmospheric phosphorus inputs , 1995 .

[36]  E. Cowling,et al.  Acidification research: Lessons from history and visions of environmental futures , 1995 .

[37]  X. Bin,et al.  The Significance of the Research on the Environment Evolution from the Lakes of M onsoon R egion in the Historical Period , 1998 .

[38]  G. Likens,et al.  Technical Report: Human Alteration of the Global Nitrogen Cycle: Sources and Consequences , 1997 .

[39]  E. Buijsman,et al.  Wet deposition of ammonium in Europe , 1988 .

[40]  M. Dickman,et al.  Multivariate analysis of heavy metal and nutrient concentrations in sediments of Taihu Lake, China* , 2001, Hydrobiologia.

[41]  W. Sunda,et al.  Feedback interactions between zinc and phytoplankton in seawater , 1992 .

[42]  Lawrence A. Baker,et al.  Environmental chemistry of lakes and reservoirs , 1994 .

[43]  Gene E. Likens,et al.  Technical Report: Human Alteration of the Global Nitrogen Cycle: Sources and Consequences , 1997 .

[44]  G. Ooms,et al.  Influence of hydrodynamic interactions between particles on the turbulent flow in a suspension , 2002 .

[45]  Michael Garstang,et al.  Saharan dust in the Amazon Basin , 1992 .

[46]  David P. Hamilton,et al.  Wind induced sediment resuspension: a lake-wide model , 1997 .

[47]  L. Tarnay,et al.  Preliminary measurements of summer nitric acid and ammonia concentrations in the Lake Tahoe Basin air-shed: implications for dry deposition of atmospheric nitrogen. , 2001, Environmental pollution.

[48]  M. Peart.  Acid rain, storm period chemistry and their potential impact on stream communities in Hong Kong. , 2000, Chemosphere.

[49]  R. Duce,et al.  The sources and forms of phosphorus in marine aerosol particles and rain from Northern New Zealand , 1985 .

[50]  D. Burns,et al.  Atmospheric nitrogen deposition in the Rocky Mountains of Colorado and southern Wyoming—a review and new analysis of past study results , 2003 .

[51]  A Review and Prospect about the Aquatic Environment Studies in Taihu Lake , 1998 .

[52]  P. Rao,et al.  Spread of acid rain over India , 1989 .

[53]  David R. Miller,et al.  Spatial and temporal variations of atmospheric deposition in interior and Coastal Connecticut , 1996 .

[54]  David S Lee,et al.  Wet deposition at the sub-20 km scale in a rural upland area of England , 1996 .

[55]  G. Bergametti,et al.  Source, transport and deposition of atmospheric phosphorus over the Northwestern Mediterranean , 1992 .

[56]  T. Kondo,et al.  Phosphorus exchange kinetics and exchangeable phosphorus forms in sediments , 1989 .