Soil LaB
2/21/2020 Soil Aeration and Temperature (Chapter 7) Notes - AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403383/View 1/8
Soil Aeration and Temperature (Chapter 7) Notes
Soil Aeration and Temperature (Chapter 7) Notes
Did you know .... Did you know wetlands play a critical role in soil and water interactions and have many ecological positives? Chapter 7 will cover soil aeration and temperature including how water and temperature effect soil properties and functions as well as wetlands.
Lecture content notes are accompanied by videos listed below the notes in each submodule (e.g. Soil Aeration and Temperature (Chapter 7) Videos A though D). Print or download lecture notes then view videos in succession alongside lecture content and add additional notes from each video. The start of each video is noted in parenthesis (e.g. Content for Video A) within each lecture note set and contains lecture content through the note for the next video (e.g. Content for Video B).
Figures and tables unless specifically referrenced are from the course text, Nature and Property of Soils, 14th Edition, Brady and Weil. .
Content Video A
Soil Aeration and Temperature 'Land, then is not merely soil; it is the fountain of energy flowing through a circuit of soils, plants, and anumals.' Aldo Leopod, A Sand County Almanac, 1949
Soil Air Composition and Exchange
AGRI1050R50: Introduction to Soil Science (2020S) LH
2/21/2020 Soil Aeration and Temperature (Chapter 7) Notes - AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403383/View 2/8
Soil Gases and Aeration Respiration – Ventilation
Oxygen Availability
Macroporosity
Water content
Oxygen consumption
Oxygen limited: 0.1 L/L
80-90% Pore Space Water – 10-20% Air
Microbial Activity / Root Respiration limited
Water Saturation – Water Logged
http://www.tn.gov/tsla/exhibits/disasters/newmadrid.htm
Redox Redox Potential – Eh – potential to transfer electrons
Ionic Species – Valence State – Availability
Oxygen – Oxidizing Agent – TEA
Important Notes: Iron Looses Electron – 2+ to 3+ - Electrons are negatively charged, so it increases valence state.
Lower the pH – Produced an H+
BALANCE – Oxidation – Reduction
2/21/2020 Soil Aeration and Temperature (Chapter 7) Notes - AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403383/View 3/8
Table 7.1 Common Soil Inorganics Reduced/Oxidized Forms
Aerated/Oxidizing Conditions: Eh 0.4 to 0.7 Volts
Anaerobic/Reducing Conditions: Eh 0.32 to 0.38 Volts
Content Video B
Ecological Effects Soil Aeration Microbial Community – Residue Breakdown
Inorganic Elements – Redox
Heavy Metals – Toxic
Soil Colors – Redox Status – Iron and Manganese
Greenhouse Gas Emission
Plant Roots – Oxygen needed
Content Video C
Wetlands Wet/Saturated/Anaerobic Conditions
Hydric Soils
Periods of saturation – Diffusion of Oxygen into soil limited
Reducing conditions
Redoxomorphic features
Hydrophytic plants
Wetland Value Species Habitat
Water Filtration
Flooding Reduction
Shoreline Protection
Recreation
2/21/2020 Soil Aeration and Temperature (Chapter 7) Notes - AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403383/View 4/8
Recreation
http://photogallery.nrcs.usda.gov/res/sites/photogallery/
Content Video D
Soil Temperature
2/21/2020 Soil Aeration and Temperature (Chapter 7) Notes - AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403383/View 5/8
More Processes Affected by Temperature Freeze/Thaw (f) – Frost Heaving (g)
Forrest Fire – Surface temperature increase, movement VOC downward, decreased infiltration rates
2/21/2020 Soil Aeration and Temperature (Chapter 7) Notes - AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403383/View 6/8
Content Video E
Soil Temperature Temperature
Solar Radiation:
Small percentage used to heat soil
Lots of interception
Specific Heat
Energy for evaporation
Albedo – Reflection back off the surface
Aspect – Angle of the sun
Thermal Properties Specific Heat amount of energy required to increase the temperature of water by 1°C
2/21/2020 Soil Aeration and Temperature (Chapter 7) Notes - AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403383/View 7/8
Specific Heat - amount of energy required to increase the temperature of water by 1 C
Heat of Vaporization – energy for evaporation HI
Thermal Conductivity
Managing Soil Temperature
2/21/2020 Soil Aeration and Temperature (Chapter 7) Notes - AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403383/View 8/8
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