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ARS Home » Northeast Area » University Park, Pennsylvania » Pasture Systems & Watershed Management Research » Research » Publications at this Location » Publication #353751
Title: Hydro-climatic simulation of Spring Creek Basin under dynamic C02 atmospheric concentration

Author
item Gunn, Kpoti
item Veith, Tameria - Tamie
item Buda, Anthony

Submitted to: ASABE Annual International Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 6/10/2018
Publication Date: N/A
Citation: N/A

Interpretive Summary: No interpretive summary is required for this Abstract. JLB.

Technical Abstract: Climate factors monitoring have indicated that global atmospheric C02 concentration rose in the past, and further rise should be expected in the future as indicated by projections. SWAT is a hydro-climatic distributed model used to assess the efficiency of agricultural and land use best management practices in watersheds. SWAT (SWAT2012) standardly models variable levels of C02 concentration and accounts for the mechanistic effects of C02 concentration on vegetation, yet dynamic change in atmospheric C02 concentration and mechanistic crop response depending on species are not implemented. Previous studies proposed SWAT modifications to account for the mechanism of dynamic C02 concentration effects. In this study, the Spring Creek basin outlet streamflow and nutrient concentrations were investigated using standard SWAT and modified SWAT, under past and future climates, and business-as-usual management practices. The Spring Creek basin is a sub-basin of the Chesapeake Bay watershed located in Central Pennsylvania. Preliminary results indicated that daily flows were generally similar under past climate, but smaller for the modified SWAT under future climate. Daily nitrate concentrations above 2 mg/L were smaller for modified SWAT under past climate but were not specific under future climate. Daily mineral phosphorus concentrations were larger for the modified SWAT for standard SWAT concentrations between 0.2 and 0.4 mg/L. Overall water balance components will be assessed and contrasted for the entire analysis to assess the importance of the dynamic C02 simulation concept.