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Spatial Variability of Nitrous Oxide Emissions and Their Soil-Related Determining Factors in an Agricultural Field

^a Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan
^b Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido 060-8589, Japan
^c Faculty of Horticulture, Chiba University, Matsudo, Chiba 271-8510, Japan
^d Faculty of Life and Environmental Science, Shimane University, Matsue Shimane 690-8504, Japan

View larger version (35K): [in a new window]   Fig. 1. Location of the study site: Mikasa, Hokkaido, Japan (•).

View larger version (20K): [in a new window]   Fig. 2. Semivariogram and isarithmic map of log-transformed N2O fluxes (measured).

View larger version (48K): [in a new window]   Fig. 3. Semivariograms and isarithmic maps of the soil properties. (Units for the isarithmic maps can be seen in Table 1.)

View larger version (50K): [in a new window]   Fig. 4. Semivariograms and isarithmic maps of the soil properties. (Units for the isarithmic maps can be seen in Table 1.)

View larger version (52K): [in a new window]   Fig. 5. Semivariograms and isarithmic maps of the soil properties. (Units for the isarithmic maps can be seen in Table 1.)

View larger version (60K): [in a new window]   Fig. 6. Semivariograms and isarithmic maps of the soil properties. (Units for the isarithmic maps can be seen in Table 1.)

View larger version (59K): [in a new window]   Fig. 7. Semivariograms and isarithmic maps of five principal components of the soil properties.

View larger version (21K): [in a new window]   Fig. 8. Semivariograms and isarithmic map of log-transformed N2O fluxes (predicted).