Effects of soil compaction and macropores on water infiltration rates
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Effects of Soil Compaction and Macropores on Water Infiltration Rates. By Lanre Adekola. Problems. Soil becomes hard like concrete when construction equipment is driven repeatedly over soil There is a decrease in vegetative growth Poor infiltration rates lead to runoff Nitrates Phosphates

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Effects of Soil Compaction and Macropores on Water Infiltration Rates

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Effects of soil compaction and macropores on water infiltration rates

Effects of Soil Compaction and Macropores on Water Infiltration Rates

By Lanre Adekola


Problems

Problems

  • Soil becomes hard like concrete when construction equipment is driven repeatedly over soil

  • There is a decrease in vegetative growth

  • Poor infiltration rates lead to runoff

    • Nitrates

    • Phosphates

    • Oils and greases

    • Salts from ice removal


Study site lake minnetonka regional park

Study Site: Lake Minnetonka Regional Park


Methods infiltration rates

Methods: Infiltration Rates

Modified Philip-Dunne Infiltrometer (MPD)


Methods laying out study area

Methods: Laying out Study Area


Goals compaction study

Goals: Compaction Study

  • To determine the soil type at the study site


Methods

Methods

Determining Soil Type


Methods1

Methods

Determining Soil Type


Methods2

Methods

Determining Soil Type

CaCO3 Content


Results for soil type

Results for Soil Type

  • Sandy Loam

    • Brown, R. B. "Soil Texture." Electronic Data Information Source. 2008. University of Florida. 6 Oct. 2008 <http://edis.ifas.ufl.edu/ss169>.


Goals compaction study1

Goals: Compaction Study

  • To determine the soil type at the study site

  • To measure infiltration rates of the compacted soil


Results infiltration vs frequency

Results: Infiltration vs. Frequency


Results infiltration rates

Results: Infiltration Rates


Comparison with rain garden infiltration

Comparison with Rain Garden Infiltration


Comparison with rain garden infiltration1

Comparison with Rain Garden Infiltration

Lake Minnetonka has 3.5 times worse infiltration Rates


Goals compaction study2

Goals: Compaction Study

  • To determine the soil type at the study site

  • To measure infiltration rates of the compacted soil

  • To determine how water infiltration is affected by bulk density


Methods bulk density

Methods: Bulk Density


Methods soil sampling positions

Methods: Soil Sampling Positions


Methods bulk density samples

Methods: Bulk Density Samples


Results bulk density

Results: Bulk Density


Comparison of compaction levels vs soil type shestak et al 2005

Comparison of Compaction Levels vs. Soil Type (Shestak et al. 2005)

Shestak, C. J. and M. D. Busse. "Compaction Alters Physical but not Biological ices of Soil Health." Soil Society of America (2005): 236-46.


Comparison of compaction levels vs soil type shestak et al 20051

Comparison of Compaction Levels vs. Soil Type (Shestak et al. 2005)

Shestak, C. J. and M. D. Busse. "Compaction Alters Physical but not Biological ices of Soil Health." Soil Society of America (2005): 236-46.


Comparison of compaction levels vs soil type shestak et al 20052

Comparison of Compaction Levels vs. Soil Type (Shestak et al. 2005)

Minnetonka Regional Park = 1.477 g/cm3

Shestak, C. J. and M. D. Busse. "Compaction Alters Physical but not Biological ices of Soil Health." Soil Society of America (2005): 236-46.


Definition of macropore

Definition of Macropore

  • Pockets of air found in soil that may influence infiltration

  • Caused by earthworms and hollowed tree roots

    • Jury, W. A. and Horton, R. Soil Physics. 6th ed. John Wiley & Sons, Inc: Hobeken, New Jersey, 2004


Goals macropore study

Goals: Macropore Study

  • Design and create macropore simulators


Methods macropore simulator

Methods: Macropore Simulator


Goals macropore study1

Goals: Macropore Study

  • Design and create macropore simulators

  • Determine how number of macropores affects infiltration rates


Methods devices used for macropores

Methods: Devices Used for Macropores

5 cm diameter MPD

Minidisk Infiltrometer

Moisture Content Device


Results macropore averages

Results: Macropore Averages


Results macropore averages1

Results: Macropore Averages


Limitations

Limitations

  • Presence of rocks and macropores in soil at Lake Minnetonka may have affected infiltration

  • Presence of small trees and shaded areas affected infiltration

  • Time between macropore flood tests varied, affecting drying rate of soil

  • Size and number of macropores may have produced unreliable results


Conclusion

Conclusion

  • Soil compaction is directly related to poor water infiltration

  • Poor infiltration is leading to runoff

  • In the absence of macropores, infiltration rates at Lake Minnetonka could be even worse


Future work

Future Work

  • Tilling/aerating

  • Composting

  • Testing water for chemical content, before and after tilling/aerating and composting


Acknowledgments

Acknowledgments

Dr. Gulliver

Nick Olsen

Greta Schmalle

Science Research Class

Mrs. Fruen


Effects of soil compaction and macropores on water infiltration rates1

Effects of Soil Compaction and Macropores on Water Infiltration Rates

By Lanre Adekola


Results for soil type1

Results for Soil Type

  • Sandy Loam

http://edis.ifas.ufl.edu/ss169


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