Hypoxia what is it do we affect it and how might our future affect it
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Hypoxia-What Is It, Do We Affect It, And How Might Our Future Affect It?. Rick Cruse. Hypoxia – What is it?. Hypoxia – What it is not?. Hypoxia – What is it?. An area of low dissolved oxygen concentrations that cannot support marine life. Typically O 2 < 2 ppm.

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Hypoxia what is it1
Hypoxia – What is it? Future

An area of low dissolved oxygen concentrations that cannot support marine life. Typically O2 < 2 ppm




Hypoxia why does it occur
Hypoxia – Why does it occur? Future

  • Freshwater and saltwater stratify


Hypoxia why does it occur1
Hypoxia – Why does it occur? Future

  • Algae bloom in freshwater

  • Algae settle to bottom

  • Algae decomposition consumes O2


Hypoxia where at what depth does it occur
Hypoxia – Where (at what depth) does it occur? Future

www.gulfhypoxia.net/Research/


Hypoxia how large an area
Hypoxia – How large an area? Future

x

http://www.epa.gov/gmpo/pdf/2007-hypoxia-pred-web-5.pdf

Turner and Rabalais, 2007

X – size in 2008



Hypoxia why does it occur3
Hypoxia – Why does it occur? Future

Algae Yield and N fertilization

Algae Yield


Hypoxia is nutrient flux constant
Hypoxia – Is nutrient flux constant? Future

co.water.usgs.gov


Hypoxia why iowa connection
Hypoxia – Why Iowa connection? Future

NO3-NConcentration in the Raccoon River at Des Moines

20.00

Annual Max

18.00

Annual Mean

16.00

14.00

12.00

10.00

NO3-NConcentration(mg/L)

8.00

6.00

4.00

2.00

0.00

1972

1977

1982

1987

1992

1997

2002

Data provided by Chris Jones Des Moines Water Works


Hypoxia why iowa connection1

Nitrate load in Raccoon River jumps, climate change? Future

Hypoxia – Why Iowa connection?

First Quarter NO3-N Load, Raccoon River at Des Moines

Data provided by Chris Jones Des Moines Water Works


Hypoxia why iowa connection2
Hypoxia – Why Iowa connection? Future

20 – 25 lb/A

www.umces.edu/President/hypoxia.htm



Look to the future
Look to the Future Future

USDA Agricultural Projections to 2016

D. R. Keeney


Corn/Soybean and Perennial Nitrate-N Concentrations in Tile Drain

  • Tile drainage system

  • U of MN - Lamberton

Gyles Randall, 2003

D. R. Keeney


Tom Kaspar Drain


Rye after corn silage
Rye after corn silage Drain

Tom Kaspar



Iowa Daily Erosion Project Drain

  • Estimates daily soil erosion, runoff and soil moisture for the state of Iowa

    • Daily estimations since 2002

    • Published in Jan/Feb 2006 Journal of the Soil and Water Conservation Society

    • Served on the web at http://wepp.mesonet.agron.iastate.edu

    • Parameterizes WEPP erosion model with radar rainfall, climate stations, and NRI


Simulated crops Drain

  • Eight scenarios based on ISU research


NEXRAD – Aug 22, 2007 Drain

Statewide mean precipitation: 1.56 in.


Switchgrass – NT, RR Drain

Sw-NTRR

CC-NT

CS-NT

CC-NTRR

CC-NTRRCC

NRI

CS-MT

CC-MTRR


Cont. Corn – NT Drain

Sw-NTRR

CC-NT

CS-NT

CC-NTRR

CC-NTRRCC

NRI

CS-MT

CC-MTRR


Corn/Soybean – NT Drain

Sw-NTRR

CC-NT

CS-NT

CC-NTRR

CC-NTRRCC

NRI

CS-MT

CC-MTRR


Cont. Corn – NT, RR Drain

Sw-NTRR

CC-NT

CS-NT

CC-NTRR

CC-NTRRCC

NRI

CS-MT

CC-MTRR


Cont. Corn – NT, RR, CC Drain

Sw-NTRR

CC-NT

CS-NT

CC-NTRR

CC-NTRRCC

NRI

CS-MT

CC-MTRR


NRI Projected Rotation Drain

Sw-NTRR

CC-NT

CS-NT

CC-NTRR

CC-NTRRCC

NRI

CS-MT

CC-MTRR


Corn/Soy - MT Drain

Sw-NTRR

CC-NT

CS-NT

CC-NTRR

CC-NTRRCC

NRI

CS-MT

CC-MTRR


Cont. Corn - MTRR Drain

Sw-NTRR

CC-NT

CS-NT

CC-NTRR

CC-NTRRCC

NRI

CS-MT

CC-MTRR




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