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Probability Distribution and Spatial Dependence of Nitrous Oxide Emission

Temporal Change in Hummocky Terrain

Dep. of Soil Science, Univ. of Saskatchewan, Agriculture Bldg., 51 Campus Dr., Saskatoon, SK, S7N 5A8 Canada

View larger version (6K): [in a new window]   Fig. 1. Profile of relative elevation (m) along the sample transect at the St. Denis Site. Tree symbol denotes location of vegetated depression.

View larger version (23K): [in a new window]   Fig. 2. Semivariogram for three sampling dates at St. Denis site. High nugget effect and range of spatial dependency of approximately 125 m for 7 Aug. 2003. Range of approximately 50 m for 30 Mar. 2004. Range of approximately 15 and 125 m for 7 Oct. 2004.

View larger version (16K): [in a new window]   Fig. 3. Daily precipitation (mm) at the St. Denis site for the 2003 and 2004 field seasons. Nitrous oxide flux measurements occurred on italicized sampling dates.

View larger version (19K): [in a new window]   Fig. 4. Mean WFPS (0–15 cm) and soil temperature (0–20 cm) at the St. Denis site for 2003 and 2004. Error bars indicate 95% confidence interval. Water-filled pore space absent for 30 March due to frozen soil. Data are presented in order of decreasing mean N2O flux.

View larger version (37K): [in a new window]   Fig. 5. Histograms of N2O data from the St. Denis transect. Each histogram has 15 bins. Data are in order of decreasing mean N2O flux.

View larger version (70K): [in a new window]   Fig. 6. Results of a Chi square test of similarity between probability distributions for N2O flux measurements at the St. Denis transect for the 15 sampling dates in 2003 and 2004. Black cells indicate distributions that were not significantly different from each other at a 0.05 probability level. Data are in order of decreasing mean N2O flux.