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Denitrification Losses from Outdoor Piglet Production

Spatial and Temporal Variability

^a Dep. of Crop Physiology and Soil Science, Danish Institute of Agricultural Sciences, P.O. Box 50, DK-8830 Tjele, Denmark
^b Dep. of Biometry, Danish Institute of Agricultural Sciences, P.O. Box 50, DK-8830 Tjele, Denmark

View larger version (60K): [in a new window]   Fig. 2. The contour plots show the distribution of several parameters in October 1997, shortly after the sows were removed from the paddock (left-hand column), and around 1 Mar. 1998 (right-hand column). The tilted frame delineates the paddock, the individual sampling positions are shown as black dots, and the two positions of the feeder are indicated by white squares. (A) and (B), denitrification activity (kg N ha-1 d-1); (C) and (D), dissolved organic carbon (DOC, mg C kg-1 dry wt. soil); (E) and (F), NO-3 (mg N kg-1 dry wt. soil).

View larger version (20K): [in a new window]   Fig. 1. In the seasonal study (Part II), the sampling positions at 5-m spacing along a transect were located using a measuring tape, and the actual sampling then took place at a 20-cm distance from the sampling position in a pre-selected direction, using a frame as shown. The direction chosen for the individual sampling was randomly selected before the seasonal study was initiated.

View larger version (25K): [in a new window]   Fig. 3. Average concentrations of dissolved organic carbon (DOC, top) and inorganic N (middle), and soil temperature and gravimetric moisture content (bottom) throughout the seasonal study. Error bars represent standard errors (SE).

View larger version (44K): [in a new window]   Fig. 4. Seasonal variations in denitrification activity (kg N ha-1 d-1) at 10 sampling positions along a transect across a paddock (not all sampling dates are shown).

View larger version (18K): [in a new window]   Fig. 5. A model on the relationship between denitrification and soil parameters (Eq. [4], see text) revealed a negative interaction between dissolved organic carbon (DOC) and soil moisture (W). The term (0.0128 - 0.00054 x W) x DOC, which is plotted against sampling time, represents the combined effect of DOC and this interaction.