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Aers 2010

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Aers 2010

  1. 1. SEASONAL PATTERNS OF NITROGEN RETENTION IN A RESTORED TIDAL FRESHWATER STREAM OF THE MID-ATLANTIC COASTAL PLAIN Joe Wood and Paul Bukaveckas Virginia Commonwealth University, Department of Biology
  2. 2. . Seasonal Variation Heterotrophic Primary Assimilation Production TidalRespiration Exchange Volume Autotrophic Assimilation Nitrogen Loads Variation in Areal Inundation Nitrogen Nutrient Availability Retention
  3. 3. • Describe seasonal patterns and annualized budgets for Project Goals Nitrogen in a recently restored tidal freshwater stream.• Estimate seasonal variation in ecosystem metabolism parameters (using diel dissolved oxygen curves)• Determine controlling factors of nitrogen retention.
  4. 4. 13000 m3 Dam Breach confining discharge to a 5 meter passageway1500m3
  5. 5. Water Fluxes 50000 0.4 45000 Chesapeake Bay Water Stage James River 0.2 40000 35000 0 30000 25000 -0.2 20000 -0.4 15000m W mEV Rgnhuo S3acxe g a u d e s 10000)(fl ) ( r t l i -0.6 5000 0 -0.8 Seo Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug 60000 50000 R² = 0.78 40000 30000 20000 10000 m E u o g n h 3 v e a c x ) ( l 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 River depth (m)
  6. 6. Annualized Budgets North River, MA (Bowden et al Kimages Creek, VA 1991) in (kg) out (kg) diff (kg) % %NH4 309 330 -21 -6.8% 1.2%Nox 1046 994 52 5.0% 6.8% DIN 1361 1323 38 2.8% 4.4%DON 2605 2827 -222 -8.5% TN 3966 4150 -184 -4.6% Cl 65641 68451 -2809 -4.3%DOC 32082 30820 631 4% TSS 113494 125627 -6067 -10%
  7. 7. 3,500 2,500 1,500 RETENTION 500 -500 DIN -1,500 RELEASENDudCeTagyxF/cIli -2,500 -3,500 3,500 Sep Oct Dec Jan Feb Mar Apr May Jun Jul Aug 2,500 1,500 500 -500 TON -1,500ONduCeTagyxF/cil -2,500 -3,500 3,500 Sep Oct Dec Jan Feb Mar Apr May Jun Jul Aug TN 2,500 1,500 500 -500 -1,500 = (DIN + TON)NduCeTagyxF/cil -2,500 -3,500 Sep Oct Dec Jan Feb Mar Apr May Jun Jul Aug
  8. 8. Metabolism Results 20.00 0.6 Kimages Creek 0.5 15.00 0.4 [NOx] 10.00 * 0.3 0.2 5.00 0.1 m O N R e a g v x / L s r J ) ( I 0.00 0MO -5.00dg2/ -10.00 R -15.00 GPP -20.00 AE Jan Feb Mar Apr May Jun Jul Aug
  9. 9. Controlling factors of NOx Retention 3,000 3,000 2,500 Sep 2,500 Sep 2,000 2,000 1,500 1,500 R² = 0.6439 R² = 0.8006 1,000 1,000 500 500 0 0Rdgone R)(t d g o n/i e ) ( t / i -500 -500 -1,000 -1,000 0 10 20 30 0 10,000 20,000 30,000 40,000 Temp (C) Exchange Volume (m3) 3,000 2,500 Sep "GPP" R² = 0.6857 2,000 "R" R² = 0.4414 1,500 1,000 500Rdgon 0e)(t/i R² = 0.709 -500 -1,000 0.00 0.20 0.40 0.60 0.00 2.00 4.00 6.00 8.00 10.00 Ambient NOx (mg/L) GPP or R (g O2/M2/Day)
  10. 10. Hurricane KyleIn < 1% of the year, 10%of total annual exchangevolume and 7% of annualNox Inflow, half of whichwas retained. (3.5% ofannual NOx retained) 1.4 Rice Pier 1.2 Ches B.B. 1 0.8 0.6 0.4 0.2 m w R h b u d e a g s r t ) ( l i 0 23-Sep-08 24-Sep-08 25-Sep-08 26-Sep-08 27-Sep-08 28-Sep-08 29-Sep-08
  11. 11. .03 .47* Temperature Exchange -.39 Volume (driven by GPP water stage Variation)-.42* R 0.62* 0.86** Ambient .80** [NOx] NOx Mass -.84** Retention Path * p < .05 analysis ** p < .01
  12. 12. .03 .47* Water Temperature -.39 Tidal Exchange GPP Volume-.42* R 0.62* 0.86** Ambient .80** [NOx] NO3 -.84** Retention * p < .05 ** p < .01
  13. 13. Conclusions• DIN Retention exhibits strong seasonal variation that includes net release. Seasonal .47* Variation -.05 (Temperature) -.39 Exchange• Metabolism, Exchange Volume and GPP Volume -.42* R 0.62* 0.86** .80** Ambient Nitrate Concentration Ambient Nutrient Concentrations -.84** NOx Mass Retention Path regulate nitrate retention. .62* * p < .05 analysis ** p < .01 Hurricane Kyle In < 1% of the year, 10%• High flow events can significantly of total annual exchange volume and 7% of annual Nox Inflow, half of which was retained. influence annual budgets of nutrient retention.
  14. 14. Thank you! • Dr. Joanna Curran • Jim Deemy • Dr. James Vonesh • Julie Frank • Dr. Chris Gough • Alex Fredua-Agyemang • Michael Brandt • Mac Lee • Kristen Cannatelli • Nader Shehadeh• Maureen Daughtery • Nathan Conway • Anne Schlegel
  15. 15. Questions?

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