Spatial and temporal dynamics of nitrogen biogeochemistry along a - - PowerPoint PPT Presentation

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Spatial and temporal dynamics of nitrogen biogeochemistry along a wetland-stream sequence Patrick Hurley a H.M. Valett a,c Ben Colman a Marc Peipoch b *b *a *c Acknowledgements Project Partners: Field & Lab Techs: Jim Ford, NRDP Claire

SLIDE 1

Spatial and temporal dynamics of nitrogen biogeochemistry along a wetland-stream sequence

Patrick Hurleya H.M. Valetta,c Ben Colmana Marc Peipochb

*a *b *c

SLIDE 2

Acknowledgements

Project Partners:

Jim Ford, NRDP Doug Martin, NRDP Beau Downing, NRDP Marisa Sowles, Geum Consulting Tom Parker, Geum Consulting Heggelund Ranch Ueland Ranch Kelley Ranch Lambert Ranch

Field & Lab Techs:

Claire Utzman Ash Micklewright Fischer Young Kate Perkins Carly Andlauer Kim Bray

SLIDE 3

Nutrients in the Upper Clark Fork River (UCFR) N and P spikes in the UCFR

Ingman & Kerr 1989

P N

SLIDE 4

Clark Fork Coalition MT DNRC

Longitudinal Study

SLIDE 5

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 10 20 30 40 Nitrate-N (ug/L) River km from Warm Springs Put-in October-NO3 April-NO3 Lost Creek UCFR

UCFR Longitudinal Nitrate

October 2016 April 2017

Valett & Peipoch 2018

SLIDE 6

Warm Springs Put-in

Silver Bow Creek Warm Springs Creek

SLIDE 7

Research Questions

I. How does biogeochemical processing change along a wetland-stream sequence?

II. How do spatial and temporal patterns

characterize nutrient dynamics in linked ecosystems?

SLIDE 8

Project Summary

Using a mass-balance approach….

Key objectives:

1. Characterize biogeochemical dynamics of wetland-stream

sequence

2. Quantify nutrient magnitude, processing efficiency, and fate
ver time and space
3. Identify drivers of material cycling and delivery to the UCFR

Silverthorn 2015

Outputs – Inputs =

Nutrient Processing?

SLIDE 9

Lost Creek Dutchman Complex (LCDC)

MT’s largest peat fen
22 km channel
157 km2 catchment
150 L/sec baseflow
0.5 km2 of open water
11.5 km2 of wetlands

SLIDE 10

Math

𝑀𝑦 = 𝑅𝑦 ∗ [𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜]𝑦 𝑀𝑝𝑝𝑝 = 𝑀𝑗𝑗 + 𝑀𝑝 − 𝑀𝑚 + Δ𝑀

𝑛𝑛 𝑡𝑡𝑡 = 𝑀 𝑡𝑡𝑡 ∗ 𝑛𝑛 𝑀

∗ 0.0864 

𝑙𝑛 𝑒𝑏𝑏

Mass Balance Load Calculation

Biology? Hydrology?

t=tributary; l=irrigation losses

SLIDE 11

Nitrate concentration over time and space

Site 3 Site 6 Site 9 Site 11 Site 12

DATE

Upstream Downstream

May 15 June 19 July 17 August 14

Sept. 19

15 MAY 19 JUNE 17 JULY 14 AUGUST 19 SEPT.

SLIDE 12

Nitrate loads over time and space

May 15 June 19 July 17 August 14

Sept. 19

Site 3 Site 6 Site 9 Site 11 Site 12

15 MAY 19 JUNE 17 JULY 14 AUGUST 19 SEPT.

DATE

Upstream Downstream

SLIDE 13

Nitrate concentration on a 22km gradient

AUGUST 22 JUNE 7 Diversion Dam Reach I Reach II Reach III Reach IV

SLIDE 14

June LNO3 vs. net groundwater exchange

Reach I Reach II Reach III Reach IV

18% 60% 14%

SLIDE 15

August LNO3 vs. net groundwater exchange

Diversion Dam Reach I Reach II Reach III Reach IV

194%
27%

6% 51%

SLIDE 16

Baseflow groundwater N concentrations

Mean NO3-N Mean NH4-N NO3-N NH4-N FORM

n = 20

SLIDE 17

Ground-surfacewater interactions & microbial processing: implications for N loads in the LCDC

Dutchman Creek Dutchman Dyke Lost Creek Fen

*Nitrification of NH4-N from anoxic groundwater to NO3-N at oxic hyporheic interface

Reach I Reach II Reach III Reach IV

SLIDE 18

SLIDE 19

LNO3 LNH4 Q % Increase Relative to UCFR

Contributions to the UCFR

May 15 June 19 July 17 August 14

Sept. 19

15 MAY 06 JUNE 19 JUNE 03 JULY

DATE

Peak Flood

SLIDE 20

Questions?

SLIDE 21

Nitrate loads on a 22km gradient

August 15 June 7 Reach 1 Reach 2 Reach 3 Reach 4

SLIDE 22

Ammonium concentration over time

May 15 June 19 July 17 August 14

Sept. 19

Site 3 Site 6 Site 9 Site 11 Site 12

SLIDE 23