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Soil Electrical Conductivity and Water Content Affect Nitrous Oxide and Carbon Dioxide Emissions in Intensively Managed Soils

^a Department of Agronomy and Horticulture, University of Nebraska, P.O. Box 830915, Lincoln, NE 68586-0915
^b USDA-ARS Soil & Water Conservation Research Unit, Department of Agronomy and Horticulture, 116 Keim Hall, University of Nebraska, Lincoln, NE 68583-0934

View larger version (18K): [in a new window]   Fig. 1. Ratio of soil NO3–N and NH4–N contents in all soils at different levels of soil EC and water contents after a 10-d incubation at 25°C.

View larger version (35K): [in a new window]   Fig. 2. Cumulative N2O emissions in all soils at 60% water-filled pore space (WFPS) and four levels of soil electrical conductivity (EC). Vertical bars show standard errors. Values in parenthesis represent the final soil EC (dS m–1) measured after a 10-d incubation at 25°C. Letters at the end of each line indicate significance of differences by LSD test at = 0.05.

View larger version (38K): [in a new window]   Fig. 3. Measured daily N2O and CO2 flux rates in Lin-CC soil at 60 and 90% water-filled pore space (WFPS) and four levels of soil electrical conductivity (EC). Vertical bars show standard errors. Values inside parenthesis show the final soil EC (dS m–1) measured after a 10-d incubation at 25°C.

View larger version (32K): [in a new window]   Fig. 4. Cumulative CO2 emissions in all soils at 60% water-filled pore space (WFPS) and four levels of soil electrical conductivity (EC). Vertical bars show standard errors. Values in parenthesis represent the final soil EC (dS m–1) measured after a 10-d incubation at 25°C. Letters at the end of each line indicate significance of differences by LSD test at = 0.05.

View larger version (36K): [in a new window]   Fig. 5. Cumulative N2O emissions in all soils at 90% water-filled pore space (WFPS) and four levels of soil electrical conductivity (EC). Vertical bars show standard errors. Values in parenthesis represent the final soil EC (dS m–1) measured after a 10-d incubation at 25°C. Letters at the end of each line indicate significance of differences by LSD test at = 0.05.

View larger version (32K): [in a new window]   Fig. 6. Cumulative CO2 emissions in all soils at 90% water-filled pore space (WFPS) and four levels of soil electrical conductivity (EC). Vertical bars show standard errors. Values in parenthesis represent the final soil EC (dS m–1) measured after a 10-d incubation at 25°C. Letters at the end of each line indicate significance of differences by LSD test at = 0.05.