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Soil Surface Fluxes of Greenhouse Gases in an Irrigated Maize-Based Agroecosystem

^a University of Nebraska-Lincoln, Dep. of Agronomy and Horticulture, Lincoln, NE 68583-0915
^b USDA-ARS Soil and Water Conservation Research Unit, Lincoln, NE 68583-0934

View larger version (31K): [in a new window]   Fig. 1. Soil surface CO2 flux measured in continuous maize at three plant populations (P1 = 69200–76600 plants ha–1, P2 = 86400–98800 plants ha–1, and P3 = 108700–116100 plants ha–1) under the M2 (intensive) fertility treatment during the 1999 growing season. Also shown are soil temperature at the 0.1-m depth and water-filled pore space in the top 0.1 m of soil.

View larger version (36K): [in a new window]   Fig. 2. Soil surface CO2 flux measured in continuous maize for the P2 (86400–98800 plants ha–1) plant population at the two fertility treatments (M1 = recommended best management; M2 = intensive) and in the unfertilized control at the P3 (108700–116100 plants ha–1) plant population during the 27-mo study. Also shown is soil temperature at the 0.1-m depth and water-filled pore space in the top 0.1 m of soil.

View larger version (38K): [in a new window]   Fig. 3. Soil surface CO2 flux measured at the between row and within row locations on all sampling dates during the 27-mo study. Also shown are soil temperature at 0.1 m and water-filled pore space in the top 0.1 m of soil at the between row and within row locations. All treatments sampled for soil surface CO2 flux are included in this comparison.

View larger version (19K): [in a new window]   Fig. 4. Comparison of measured soil surface CO2 flux with predicted values. The empirical equation was fit to data collected from fertilized continuous maize plots from 11 June 1999 through 9 Sept. 2000. Predicted daily average values are compared with daily average flux measurements made from 26 Sept. 2000 through 18 Aug. 2001 on fertilized continuous maize plots.

View larger version (18K): [in a new window]   Fig. 5. Mean nitrous oxide flux measured on 23 May, 12 July, and 24 Aug 2000 for the two fertility treatments (M1 = recommended best management; M2 = intensive) plotted against the difference between treatment means for field-measured electrical conductivity (EC) and mean EC measured in unfertilized control areas on the same sampling days.