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Denitrification Potential in Relation to Lithology in Five Headwater Riparian Zones

Department of Geography, York University, Toronto, ON, Canada M3J 1P3

View larger version (21K): [in a new window]   Fig. 1. Location of study sites.

View larger version (36K): [in a new window]   Fig. 2. Vertical cross-sections of (top) Highway 27, (middle) Vivian Creek, and (bottom) Maskinonge riparian zones showing lithology and saturated hydraulic conductivity (cm d–1) for piezometer openings (dots). The < term indicates hydraulic conductivity of <0.2 cm d–1. Dashed lines indicate the maximum and minimum water table positions during 2000–2002. Vertical arrows indicate the position of the riparian–field perimeter and stream bank. Numbers above represent piezometer nests and soil sampling locations.

View larger version (33K): [in a new window]   Fig. 3. Vertical cross-sections of (top) Ganatsekiagon and (bottom) Road 10 riparian zones showing lithology and saturated hydraulic conductivity (cm d–1) for piezometer openings (dots). The < term indicates hydraulic conductivity of <0.2 cm d–1. Dashed lines indicate the maximum and minimum water table during 2000–2002. Vertical arrows indicate the position of the riparian–field perimeter and stream bank. Numbers above represent piezometers nests and soil sampling locations.

View larger version (32K): [in a new window]   Fig. 4. Vertical texture profiles of the Ganatsekiagon and Highway 27 riparian zones. Numbers indicate soil sampling locations shown in Fig. 2 and 3.

View larger version (35K): [in a new window]   Fig. 5. Vertical texture profiles of the Vivian Creek and Road 10 riparian zones. Numbers indicate the soil sampling locations shown in Fig. 2 and 3.

View larger version (28K): [in a new window]   Fig. 6. Vertical profiles of organic matter content in the five riparian zones. Numbers on each profile indicate soil sampling locations shown in Fig. 2 and 3. Note that the horizontal scale differs among the riparian zones and the vertical scale for Road 10 differs from the scale of the other sites.

View larger version (25K): [in a new window]   Fig. 7. Vertical variations of potential denitrification (mg N kg–1 dry soil d–1) estimated from N2O accumulation between 2 and 5 h and after 24 and 72 h in the Highway 27 riparian zone (Sites 2 and 6). See Fig. 2 for site locations. The term T indicates <0.1 mg N kg–1 d–1, while N indicates no activity.

View larger version (36K): [in a new window]   Fig. 8. Vertical variations of potential denitrification (mg N kg–1 dry soil d–1) estimated from N2O accumulation between 2 and 5 h and after 24 and 72 h in the Vivian Creek riparian zone (Site 2 and 4) and Ganatsekiagon riparian zone (Site 1). See Fig. 2 and 3 for site locations. The term T indicates <0.1 mg N kg–1 d–1, while N indicates no activity.

View larger version (35K): [in a new window]   Fig. 9. Vertical variations of potential denitrification (mg N kg–1 dry soil d–1) estimated from N2O accumulation between 2 and 5 h and after 24 and 72 h in the Maskinonge riparian zone (Sites 4 and 7). See Fig. 2 for site locations. The term T indicates <0.1 mg N kg–1 d–1, while N indicates no activity.

View larger version (22K): [in a new window]   Fig. 10. Vertical variations of potential denitrification (mg N kg–1 dry soil d–1) estimated from N2O accumulation between 2 and 5 h and after 24 and 72 h in the Road 10 riparian zone (Sites 2, 3, and 5). See Fig. 3 for site locations. The term T indicates <0.1 mg N kg–1 d–1, while N indicates no activity.

View larger version (11K): [in a new window]   Fig. 11. Relationship between denitrification potential (DNP) and (top) subsurface sediment organic matter content and (bottom) subsurface sediment silt + clay content in the five riparian zones.