NAWQA Nutrient Synthesis Past, Present, and Future. USGS Workshop on Nutrient Processes in the Upper Mississippi River Basin UMESC, LaCrosse, WI March 25 – 26, 2002 Jeff Stoner Dave Mueller Norm Spahr Tom Nolan Barb Ruddy Mark Munn Richard Alexander. NAWQA Past 1992 - 2000.
NAWQA Nutrient SynthesisPast, Present, and Future
USGS Workshop on Nutrient Processes in the Upper Mississippi River Basin
UMESC, LaCrosse, WI
March 25 – 26, 2002
Streams (NO3+NO2, NO2, NH4+OrgN, NH4, TN, DP, OPO4, TP, DOC, SOC)
Ground water (NO3+NO2, NO2, NH4, OPO4, DOC)
Stream habitat, basin and well characteristics, soils, geology, land use and cover, chemical use
Center Creek - Missouri - 760 km2
Predicted Nitrate (mg / L)
Water years 1994-95
Total Phosphorus in Streams
Total Nitrogen in Streams
Total Nitrogen in Large Rivers
Mixed Land Use
Nitrate Probability in Shallow Ground Water
To be published in ES&T,
B.T. Nolan and others, 2002
Influence of Land Use on Water Quality and Aquatic Biology in Small Streams and Ground WaterUMIS NAWQA Study Unit
Nutrient yields are largest in streams
draining agricultural areas
Interrelations Between Physical, Chemical and Biological Variables, even for Large Rivers, may best be Explained by Study-Unit Investigators
Nitrite + nitrate
Major Tributaries Have Opposite Influences
on Main Stem TN and TP Concentrations
Sources and Transport of Agricultural Chemicals in Streams and Ground Water
Effects of Nutrient Enrichment on Agricultural Streams
Seasonal TotalNitrogen in Streams
Combinations of colors indicate multiple
seasons of high concentrations, ex. winter-spring
Stream Sites in the NAWQA Trends Program
Compare: 505 to 145 sites; 1st to 2nd decade
NAWQA Trend Sites on Large Rivers
(2001 – 2010+)
NAWQA Trend Sites on Targeted Land Use
(2001 – 2010+)
Determine how biological communities and processes respond to varying levels of nutrient enrichment in agricultural streams from contrasting environmental settings.
Land UseNutrients SedimentPesticides
Wooded riparian corridors
DO, pH, SOC relations
Fish & Wildlife
GW-SW relationsSoil Permeability
Factors used to define hydrologic landscape regions
Precip – Potential evapotranspiration
Large and consistent nutrients data base for streams and ground water at multiple scales.
Relations to broad categories of land use.
Continue status of nutrients conditions and improve confidence in statistical correlations to land use on other physical factors.
A consistent look at time trends and why.
Improve understanding of biogeochemical processes within streams and near hyporheic zones (NEET) .